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\title{Detection of the Inhibitory Potential of Psidium Guajava L. Extract in Multidrug-Resistant Corynebacterium Striatum Strains Isolated from Nosocomial Outbreaks}
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             \author[1]{Beatriz Rodrigues  Ribeiro}

             \author[2]{Pedro Guimarães  Machado}

             \author[3]{Grazielly Ribeiro  Viana}

             \author[4]{Msc. Fellipe de Oliveira  Cabral}

             \author[5]{Arize Duarte  Vieira}

             \author[6]{Msc. Talita Barbosa  Gomes}

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\date{\small \em Received: 1 January 1970 Accepted: 1 January 1970 Published: 1 January 1970}

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\begin{abstract}
        


Corynebacterium striatum is an emerging Gram-positive bacillus that presents tropism for thehuman microbiota, however, it has a high probabilityofpresenting a multidrug-resistant (MDR) profile. In addition, severalstudiesindicate its abilityto cause seriousinfections in patients with varying levels of immune compromise. C. striatum samples may present different virulence mechanisms such as; disinfectant tolerance, motility, and bacterial biofilm formation. This work aims to evaluate the antimicrobial activity of the hydroalcoholic extract of Psidium guajava L. on MDR and MDS strains of C. striatum an alternative for treatment. We used the agar disk diffusion method to evaluate the susceptibility of bacterial samples under conditions of treatment with Psidium guajava L.

\end{abstract}


\keywords{corynebacterium striatum, psidium guajava l., nosocomial, PFGE, MDR, MDS, antimicrobial activity.}

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{{\textit{CrossRef DOI of original article:}} \underline{}}
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source for the search for new options against bacterial multidrug resistance, giving an incentive to seek new alternatives and isolation of molecules from plants to be able to use and fight multidrug-resistantinfections.\par
Keywords: corynebacterium striatum, psidium guajava l., nosocomial, PFGE, MDR, MDS, antimicrobial activity, hydroalcoholic extract, myrtaceae, mueller hinton agar, quorum sensing. Resumo-A Corynebacterium striatum pertence ao gênero Corynebacterium representam um grande número de bactérias gram-positivas não formadoras de esporos, encontradas naturalmente em flora bacteriana da pele e de mucosas e encontra-se amplamente disseminadas pelo meio ambiente, onde em 2009 causou um surto nosocomial no Hospital Universitário Pedro Ernesto, e em um trabalho realizado por Baio et al, identificou por Eletroforese em gel de campo pulsado (PFGE) 10 perfis clonais de C. striatum, entre eles, o nosso trabalho utilizou os clones MDR/RJ 1987/PFGE I e MDS /RJ 1961 PFGE III. Nas bactérias existe um mecanismo que detecta a densidade de outras bactérias, chamado de quorumsensing (Q.S.), que é um sensor de densidade que está ligado a uma variedade de comportamentos fisiológicos nas bactérias, que permite que grupos de bactérias alterem o comportamento de maneiras síncrona em resposta a regulações de fatores de virulência, tolerância de desinfetante, formação de esporos, produção de toxinas, motilidade e formação de biofilme bacteriano. Este trabalho tem como objetivo avaliar a atividade antimicrobiana do extrato hidroalcóolico de Psidiumguajava L., comumente conhecido como goiabeira, da família Myrtaceae,sobre cepas MDR e MDS de C. striatum e avaliar o efeito modulador do extrato sobre antibióticos convencionais, pois pode aumentar a eficácia dos agentes antimicrobianos no tratamento de infecções. Para a avaliação da atividade antimicrobiana foi utilizado o método de disco difusão em ágar Mueller Hinton (TSA). Os resultados demonstraram no teste disco difusão cepas bacterianas independente do seu perfil de resistência MDS 1987 e MDR 1961 apresentaram sensibilidade ao extrato 100\% bruto de P. guajava, apresentando halos de inibição de 13mm e 14 mm, respectivamente. No teste de sinergismo obteve-se melhor resultado com a cepa MDR1961, não teve resultado com cepa MDS1987. Os resultados dessa pesquisa de conclusão de curso podem ser considerados uma fonte promissora para a busca de novas alternativa frente a multirresistência bacteriana, dando um incentivo a buscar novas alternativas e isolamento de moléculas dos vegetais para poder utilizar e combater as infecções multirresistentes. Corynebacterium striatum, a species initially considered to be part of the normal amphibiotic microbiota of human skin and nasal mucosa, has been recognized as a potentially virulent pathogen capable of causing invasive infections and nosocomial outbreaks  {\ref (Wonget al., 2010;} {\ref Souzaet al., 2020)}. In recent decades, an increasing number of invasive infections caused by multidrug-resistant(MDR) and multi-sensitive (MDS) samples of C. striatum have been observed in immunocompromised and immunocompetent patients, including: pneumonia  {\ref (Tarret al., 2003;} {\ref Renomet al., 2007)}, sepsis  {\ref (Dallet al., 1989)}, synovitis and septic arthritis \hyperref[b49]{(Scholle et al., 2007)}, osteomyelitis  {\ref (Fernández-Ayalaet al., 2001)}, endocarditis, meningitis and recurrent bacteremia  {\ref (Weiss et al., 1996;}\hyperref[b61]{Syed et al., 2019)}. C. striatum has also been recognized as an etiologic agent of liver abscesses \hyperref[b59]{(Stone et al., 1997)}, peritonitis \hyperref[b15]{(Bhandari et al., 1995)}, surgical wounds \hyperref[b32]{(Moore et al., 2010)}, keratitis \hyperref[b20]{(Heidemann et al., 1991)} and intrauterine infections  {\ref (Boltinet al., 2009)}. The first case of urinary infection in an immunocompetent outpatient was observed in Spain \hyperref[b14]{(Beteta et al., 2009)}  
\section[{Palavras}]{Palavras} 
\section[{Patients}]{Patients}\par
undergoing invasive medical procedures are susceptible to infections by C. striatum, because bacterial interaction with the surface of the abiotic substrate can allow colonization through the production of bacterial biofilm \hyperref[b61]{(Syed et et al., 2019)}. Previous studies have also demonstrated the ability to spread C. striatum from patient to patient and through the contaminated hands of healthcare professionals  {\ref (Brandenburg et al., 1996)}.\par
In a study published by \hyperref[b11]{Baio et al., (2013)}, phenotypic and genotypic characteristics of multidrugresistant (MDR) and susceptible strains (n=14) of C. striatum isolated during an outbreak in 2009 at Hospital University Pedro Ernesto (HUPE) were described. Rio de Janeiro, Brazil. Subsequently, other strains were identified in HUPE itself and at the Hospital Municipal Jesus, revealing other multidrug-resistant pulses  {\ref (Ramos et al., 2019;}\hyperref[b54]{Souza et al., 2019;} {\ref Souza et al., 2020)}.\par
The pathogen was isolated in the various sectors of the hospitals, from different anatomical sites, in adult individuals, where half the patients were 50 years of age or older. Most strains of C. striatum strains were isolated from tracheal aspirates, from patients undergoing endotracheal intubation procedures, and from blood in ICUs and surgical wards (Silva \& Motta et al. 2022).\par
They were initially indicated by pulsed-field gel electrophoresis (PFGE-Pulsed-Field-Field Gel Electrophoresis), the presence of ten distinct clonal profiles (PFGE I, II, III and IV) with a predominance of pulse type I among, the samples. Clones I and II were isolated from tracheal secretion and blood. Type III and IV clones were isolated from urine and wound secretion, respectively. The authors identified the PFGE I, and II profiles as related clones of MDR strains. The PFGE III and IV profiles of C. striatum were identified as clones sensitive to the various drugs tested.\par
In bacteria, there is a mechanism that detects the density of other bacteria, called quorum sensing (Q.S.), which is a density sensor that is linked to a variety of physiological behaviors in bacteria (both Gram-negative and Gram-positive) (Zhao et al., 2020), which allows groups of bacteria to change behavior in synchronous ways in response to regulations of virulence factors, disinfectant tolerance, spore formation, toxin production, motility and bacterial biofilm formation  {\ref (Mukherjee et al., 2019;} {\ref Ding et al., 2020)}. In this system, bacteria control the behavior of the entire bacterial population to synthesize and secrete signaling molecules (called autoinducers), being able to communicate and orchestrate the structure and function of biofilms (Yu et al., 2020; Gopalakrishnan et al., 2021). But the change in the expression and behavior of its genes only happens when the signaling (self-inducing) reachesa limited concentration, being able to have communication, and synchronization in particular behaviors on a population scale, thus gaining the ability to function as a multicellular organism (Gopalakrishnan et al., 2020).\par
The biofilm can be defined as a set of bacteria firmly attached to a surface, encompassed by an extracellular matrix composed of polysaccharides, proteins and nucleic acids produced by the bacteria themselves  {\ref (Costerton et al., 2003)}. The biological cycle for the formation of a biofilm goes through 5 stages, the first being contact, where it is reversible and is maintained by non-specific physicochemical interactions; The second stage being adhesion, where there is a change from the reversible to the irreversible step; The third being the formation of small settlement, with the bacteria secreting the signaling molecules and causing all the bacteria there to create a colony that works in sync and with this colony the mature biofilm is formed; The fourth stage being maturation, where the total formation of the biofilm is completed, being surrounded by various substances and creating a system of exchanges of nutrients that need to come out of the biofilm; And the fifth stage is the dispersion that occurs when the environment is not more favorable and consists of the detachment in the form of cell aggregates, to colonize newhabitats and restart the formation of recent biofilms  {\ref (Monroe et al.,2007)}. During the stages of contact, adhesion and construction of small colonies, each bacterium starts to produce signaling molecules that, depending on the local stimuli and mainly on the concentration reached in the microenvironment, trigger the activation of specific genes with the change from the phenotype of planktonic bacteria to the biofilm phenotype, as illustrated in Figure 1  {\ref (Monroe et al., 2007)}. The extracellular envelope protects them against physical and chemical Epidemic outbreaks caused by MDR strains of C. striatum have been documented in patients hospitalized for long periods and, or continuously exposed to broad-spectrum antimicrobials in intensive care units  {\ref (Boltin et}  aggressions from the external environment, such as the action of ultraviolet rays and changes in pH and osmolarity, in addition to significantly reducing the activityof adaptive and innate mechanisms of the immune system, such as the action of phagocytic cells and opsonization of antibodies (Hoyle \& Costerton 1991).\par
The increase in bacterial resistance to the various antimicrobial agents used in the clinic is a global Public Health problem that draws the attention of national and international government agencies such as the World Health Organization (WHO), the Centers for Disease Control and Prevention (CDC/USA), ANVISA, as well as Committees on Hospital Infections (CCIH) from various health institutions \hyperref[b35]{(Oliveira et al., 2009)}.\par
Resistance to a particular antimicrobial may be an intrinsic property of a bacterial species or an acquired ability. Todevelop resistance, the bacterium must change its DNA, genetic material, which occurs in two ways: 1. induction of mutation in native DNA; 2. introduction of foreign DNA -resistance genes -that can be transferred between different genera or species of bacteria \hyperref[b8]{(ANVISA, 2007)}.\par
Cell membrane permeability is essential for the antibiotic to have the desired effect, be it bactericidal or bacteriostatic (Goodman\& Gilman's, 2008). Drugs can enter the bacterial cell membrane in three ways: simple diffusion through the phospholipid bilayer, by diffusion facilitated by membrane proteins, called porins, or by self-promoted uptake, where the penetration of the drug into the bacteria is related to the characteristic physicalchemistry of antibiotics, such as the polarity and sizes of molecules, modifying the liposaccharide content. Structures and amounts of porins, when they are modified, lead to bacterial resistance, as any decrease in the function and quantity of porins will lower the level of antibiotic inside the bacterial cell (Costa \& Silva Junior, 2017).\par
Most antibiotics specifically bind to their targets with high affinity and thus prevent normal target activity. However, structural changes in the target that prevent effective binding between the target and the antibiotic confer resistance \hyperref[b17]{(Blair et al., 2015)}. Alternatively, a newly acquired gene may act to modify a target, making it less vulnerable to a particular antimicrobial. Thus, this gene carried by plasmid or transposon encodes an enzyme that inactivates targets or alters the binding of antimicrobials in order to prevent the occurrence of any inhibitory or bactericidal effect (ANVISA, 2007).\par
Efflux pumps are membrane proteins that export antibiotics to the extracellular environment, keeping intracellular concentrations at low levels. that code for different antibiotic transporters (Costa \& Silva Junior, 2017).\par
The enzymatic mechanism of resistance occurs due to the inactivation of the drug from the production, by the bacteria, of enzymes that degrade or inactivate the antibiotic. Involving three types of enzymatic reactions, such as hydrolysis, transfer of a chemical group or redox process (Costa \& Silva Júnior 2016). The classic example of this resistance mechanism is the production of ?-lactamase that hydrolyzes the ?-lactam ring of penicillins \hyperref[b23]{(Kumar \& Varela 2013)}.\par
Studies described that multiple drug resistance (MDR) can be defined when gram-negative and grampositive bacteria are resistant to three or more classes of antimicrobials. Pan-resistant bacteria (PANDR) are defined as resistant to all antimicrobial agents \hyperref[b26]{(Magiorakos et al., 2012)}.\par
Several studies have shown an increase in the rate of antimicrobial resistance among Corynebacterium species. Resistance to ?-lactams, Clindamycin, Erythromycin, Ciprofloxacin and Gentamicin has been reported, sometimes leading to the use of Vancomycin as the drug of choice. To date, vancomycin, teicoplanin and linezolid are the most effective agents in vitro against Corynebacterium  {\ref (Martins et}  Antibiotic resistance develops as a natural consequence of the ability of the bacterial population to adapt. The indiscriminate use of antibiotics increases the selective pressure and also the opportunity for the bacteria to be exposed to them. That opportunity facilitates the acquisition of resistance mechanisms  {\ref (Santos, 2004)}.\par
Given the increasing reports on different bacterial genera presenting resistance to several antimicrobial agents, mainly in the last decades, concomitantly, the search for new substances with antimicrobial potential also grows exponentially (Carneiro et al., 2014).\par
One of these alternatives is the extract of Psidium guajava L., commonly known as guava, from the Myrtaceae family, is a plant native to tropical America \hyperref[b46]{(Sanchez et al., 2005)}, has been historically used in folk medicine, traditional for the treatment of different respiratory disorders, diabetes, hypertension, as well as analgesic, antipyretic, anti-inflammatory, healing and antimicrobial functions  {\ref (Matos 2002;} {\ref Fu et al., 2016)}.\par
In previous studies, the biological actions of the crude extract of the leaves of P. guajava L. were proven in the treatment of diarrhea, dysentery, lung diseases, and bronchitis, other properties were also attested, giving the species antispasmodic, antimicrobial, antiinflammatory, anticonvulsant, analgesic, antidiabetic, antihyperlipidemic and antioxidant \hyperref[b53]{(Souza et al.,2015)}.\par
According to Desotiin 2011, the antimicrobial effect of guava essential oil was proven, by the microdilution plate method, against some Gram-positive and Gram-negative microorganisms and yeasts.\par
Its main constituents are tannins, flavonoids, essential oils, sesquiterpenoid alcohols, and triterpenoid acids. The parts used by the plant are the bark, shoots, leaves, and roots.  {\ref (Gondim et al., 2006;}\hyperref[b3]{Amaral et al., 2006)} The combination of plant-derived products and conventional antimicrobial drugs is a promising strategy, as it can increase the effectiveness of antimicrobial agents in treating infections caused by multidrugresistant microorganisms  {\ref (Fernandes et al., 2012)}.\par
Therefore, we want to investigate the antibacterial action of leaves of P. guajava on the samples of C. striatum, in this way, also to evaluate its potential for synergistically modulate the action of antibiotic available for treatments against gram-positive bacteria of clinical importance.\par
Given the reports on different bacterial genera presenting resistance to various antimicrobial agents, mainly in the last decades, there is a need for the search for new substances with antimicrobial also increase  {\ref (Carneiro et al., 2014)}.\par
About all the problems that we narrate, there is a need to seek new therapeutic alternatives to combat multidrug-resistant bacteria, where it will be necessary to have qualified pharmaceutical professionals to understand the importance of diagnosis and the functionality of antibiotics, who, together with pharmacological knowledge, can seek new ways of controlling or eliminating multidrug-resistant bacterial infections. 
\section[{II.}]{II.} 
\section[{Materials and Methods}]{Materials and Methods}\par
Mature leaves of P. guajava L. were collected in the lake's region, in the city of Armação dos Búzios, in a home plantation in the Vila Caranga neighborhood, on February 20th. To avoid contamination in the material, the leaves were washed in running water and then immersed in diluted chlorine at a concentration of (1:20) for one minute, as a subsequent rinse to remove the excess. Then the leaves were left on paper towels and under protection against the sun, waiting for the leaves to dry.\par
To obtain the hydroalcoholic extract, 100 grams of dry material were immersed in 500 ml of 70\% ethanol. The solution was stored in closed glass vials and wrapped in aluminum foil to prevent light interference. This condition was maintained for 15 days and shaken three times a day. After this interval, the solution was filtered using a funnel with hydrophilized gauze. To avoid the interference of ethanol in the test, the extract was evaporated in a water bath at 45ºC until a viscous liquid was obtained. The solution was kept in a light-free environment. \hyperref[b4]{(Andrade et al., 2019)} beingreadyto perform the antimicrobial test, 1ml of 100\% extract was distributed in 6 sterile test tubes (Figure  {\ref 01}).\par
Two strains of C. striatum from a nosocomial outbreak started in 2009 and isolated from patients admitted to Hospital University Pedro Ernesto (HUPE/UERJ) located in the metropolitan region of the state of Rio de Janeiro, Brazil, were used (Table \hyperref[tab_6]{01}).\par
The microorganisms are stored in Skim Milk at -70ºC, in the Bacterioteca of the Laboratory of Diphtheria, and Corynebacterioses of Clinical Importance -LDCIC -Discipline of Microbiology and Immunology -FCM/UERJ, partner laboratory of the Faculty of the Lagos Region. Strains were thawed, reactivated and confirmed after new identification by conventional biochemical techniques and confirmed by automated methods such sequencing of 16S and rpoB genes and mass spectrometry (MALDI-TOF). Additionally, the samples were characterized by pulsedfield electrophoresis (PFGE) genetic analysis and were classified into different pulse type \hyperref[b11]{(Baio et al., 2013)}.For this work, we selected a multi-resistant strain MDR/RJ 1987/PFGE I and another MDS/RJ 1961 PFGE III Pulse types previously characterized and identified after the outbreak.\par
The inoculums were prepared andstandardized in sterile saline solution, comparing the turbidities with the tube nº 0.5 of the McFarland scale to obtain about 10 6 CFU/ml \hyperref[b30]{(Mendonça et al., 2016)}.\par
In two Petri dishes containing Mueller Hinton Agar as the culture medium, the bacterial inoculum prepared with the sterile saline solution (0.5 turbidity on the McFarland scale) was drained with sterile swabs and distributed. Uniformly over the agar surface \hyperref[b50]{(Silveira et al., 2009)}. The first plate with the MDR/RJ 1987/PFGE I strain, respectively, and the MDS/RJ 1961 PFGE III strain on the second plate. In the esection for 30 seconds at a concentration of 100\% of the extract in tube 1 of Figure 2  {\ref (Stieven et al., 2009For} the negative control, we used disks with saline solution and for positive control, we used vancomycin (30mcg)(Figure  {\ref 2}). Then, with the plates already striated and with the discs, the inverted plates were incubated at 37°C for 24 hours, after which the of inhibition zones were measured, in millimeters. The result was determined by comparative descriptive statistics from the growth inhibition halos (mm) found, using a universal caliper to the halos formed (Figure  {\ref 3}).\par
To determine the modulating effect, two Mueller Hinton agar plates were used, with sterile swabs, the Mc Farland 0.5 scale inoculum was used up, and, the strains MDR/RJ 1987/ was evenly distributed on the first plate. PFGE I and on the second plate the strain MDS /RJ 1961 PFGE III, the leaves were identified with the places where the antibiotics were placed in the extracts for 30 seconds, each antibiotic in tubes 2 to 6, respectively (Figure  {\ref 4}), and only the antibiotics. The antibiotics Gentamicin (GEN 10), Ciprofloxacin (CIP 05), Erythromycin (ERI 15), Imipenem (IPM 10) and Ampicillin (AMP 10) were used. The result is determined by comparing the halos of pure antibiotics and antibiotics dipped in the P.guajava L extract. Then, with the plates already streaked and with the disks, the plates were incubated at 37°C for 24 hours, and after this period, the inhibition zones were in millimeters. (Figure  {\ref 5}). 
\section[{III.}]{III.} 
\section[{Resultados e Discussões}]{Resultados e Discussões}\par
Due to the abusive use of traditional antibiotics and the increasing increase in microbial resistance, clinical microbiologists have shown great interest in the investigating of plant extracts with antimicrobial potential  {\ref (Volpato 2005)}.\par
The results related to the Disk Diffusion test in agar in the presence of the extract with antimicrobial expectation are described in Table \hyperref[tab_5]{2}. The bacterial strains, regardless of their resistance profile, MDS 1987 and MDR 1961, showed sensitivity to the 100\% crude extract of P. guajava, showing inhibition halos of 13mm, and 14mm, respectively (Figure  {\ref 5}). Interestingly, our results corroborate the statements of \hyperref[b16]{Biswas et al., (2013)}, who showed that Gram-positive bacteria were more susceptible to an extract of P. guajava \hyperref[b16]{(Biswas et al., 2013)}.\par
Also, in the studies by Sanches et al.,  {\ref (2005)}, it was possible to verify that the ethanol-based extracts: water from leaves, stem bark and roots of P. guajava showed activity against Staphylococcus aureus, grampositive microorganisms, as well as our samples studied from Corynebacterium.\par
For \hyperref[b25]{Lopes et al., (2006)} the formation of inhibition halos under the microorganisms tested is due to a synergistic effect of all its constituents, phytochemical compounds: tannin, phenols, flavonoids and alkaloids \hyperref[b25]{(Lopes et al., 2006)}. A study carried out by \hyperref[b2]{Alves et al., (2006)} showed that the extract is capable of also having antifungal properties against strains of Candida albicans, Candida tropicalis, and Candidakrusei \hyperref[b2]{(Alves et al., 2006)}.\par
The results referring to the agar diffusion tests with evaluation of the antibacterial potential of the hydroalcoholic extract of P. guajava in synergistic action showed complex and interesting results (Table  {\ref 3}). When the extract was synergistically exposed together with the discs containing antibiotics on the MDR 1987 sample isolated from the respiratory tract, it favored the inhibitory potential of all the antibiotics tested, since, without the action of the extract, the antibiotic discs alone were not able to inhibit the multiplication of this MDR Strain (Table  {\ref 4} and Figure  {\ref 5}). Interestingly, demonstrating the need for more studies that can clarify several doubts about the resistance mechanisms of these C. striatum samples, the hydroalcoholic extract of P. guajava, when exposed together with antibiotics, reduced the inhibition halos of the MDS 1961/ MDS in all antibiotics, when compared to discs without the extract (Tables  {\ref 3} and {\ref Figure}   {\ref 5}) .\par
In this evaluation, gentamicin and erythromycin were the antibiotics that were most inhibited during the synergism process, significantly reducing their effectiveness by 58\% and 32\%, respectively.\par
Table  {\ref 4} shows that MDS 1961 strains did not achieve synergism. All ATM+G halos (antibiotic plus extract) decreased. A possible explanation is the presence of a secondary metabolite of the plant that caused interference in the antibiotic action and, or the possibility of the hydroalcoholic extract having diluted the antibiotic, consequently decreasing its activity and the size of the halo.\par
We observed better results with the MDR 1987 strain, table 4, where the bacterium was shown to be resistant to all antibiotics, Stilladded to the hydroalcoholic section, halos were formed, it is possible that the extract presents a certain metabolite that inhibited the mechanism of resistance of C striatum MDR 1987. \hyperref[b51]{Simões et al., (2018)} observed that the antimicrobial action of Psidium guajava might be related to the inhibition of bacterial enzymes, direct action on the membrane of microorganisms, or competition for metal ions, whichessentialfor microbial metabolism. With this, it can make the synergisticinteractions capable of increasing or improving the potency of antibiotics against a multidrug-resistant microorganism.\par
For \hyperref[b37]{Pereira et al., (2014)}, A strategy enhance the action of plant extracts, as well as to reverse the resistance of such strains to antibiotics that are already on the market, is to associate these natural products with drugs for clinical use, seeking to interactions the synergistic. Through this strategy, it can be seen in Table  {\ref 4} that the synergism of the P. guajava extract with the antibiotics managed to inhibit and create halos of relatively positive sizes in the MDR strains, 90\% of them above 20mm.\par
The results obtained in this research are important to show that the antimicrobial activity of the extract used against the microorganism C. striatum was relevant as the strains MDR 1987 since the strains tested are directly related to the occurrence of cases of nosocomial outbreaks. 
\section[{IV.}]{IV.} 
\section[{Conclusion}]{Conclusion}\par
We can conclude that C. striatum remains an emerging and dangerous pathogen, capable of causing serious infections and promoting nosocomial outbreaks. inhibit or favor the antibiotic action of different antimicrobial agents when used in bacterial samples independent of the antimicrobial susceptibility profile. Additionally, the P. guajava extract also established important results in the tests combined with therapies, indicating possible selective synergism between the ATBs and the botanical extract in the Multidrug-resistant Exposures, modifying the susceptibility profile of the MDR samples, which started to show sensitivity to the tested ATBS, boosting the possibility for further studies that confirm the potential for selective action in MDR Selection. Given the current scenario with safe antimicrobial alternatives, and with the increase in multiresistant microorganisms, researchers must continue the search for new therapeutic compounds, emphasizing that the extract of P.  {\ref guajava}     \hyperref[b11]{(Baio et al., , 2013)}; **, Analysis of complete genome sequencing with GenBank number access LAYR00000000 \hyperref[b14]{[15]} \begin{figure}[htbp]
\noindent\textbf{34}\includegraphics[]{image-2.png}
\caption{\label{fig_0}Figure 3 Legends: 4 Legends:}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{P{0.15045620437956206\textwidth}P{0.030246350364963502\textwidth}P{0.023266423357664233\textwidth}P{0.005428832116788321\textwidth}P{0.017062043795620437\textwidth}P{0.00697992700729927\textwidth}P{0.5591697080291971\textwidth}P{0.015510948905109487\textwidth}P{0.020164233576642335\textwidth}P{0.014735401459854015\textwidth}P{0.0015510948905109489\textwidth}P{0.003877737226277372\textwidth}P{0.0015510948905109489\textwidth}}
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Corynebacterium spp. belong to the skin and}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{mucosal microbiota and are widely disseminated in the}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{environment. There have been increasing reports of}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{cases of human infections caused by some species of}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Corynebacterium, both in industrialized and developing}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep countries,\tabcellsep which\tabcellsep can\tabcellsep lead\tabcellsep to\tabcellsep death\tabcellsep in\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{immunocompromised and immunocompetent patients}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{(Ramoset al., 2014).}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Serious infections by Corynebacterium spp.}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{expressing a multidrug resistance (MDR) profile to}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{antimicrobial agents is attributed to samples of}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Corynebacterium jeikeium, cases of infections by MDR}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{samples of other species have been described,}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep including\tabcellsep Corynebacterium\tabcellsep urealyticum,\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Corynebacterium}\tabcellsep amycolatum,\tabcellsep Corynebacterium\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{afermentans, Corynebacterium pseudodiphtheriticum}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{and Corynebacterium striatum, especially in healthcare}\\
\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{settings (Wanget al., 2019).}\\
\tabcellsep Chaves:\tabcellsep \multicolumn{3}{l}{corynebacterium}\tabcellsep \multicolumn{2}{l}{striatum,}\\
\multicolumn{7}{l}{psidiumguajava l., nosocomial, PFGE, MDR, MDS,}\\
atividade\tabcellsep \multicolumn{2}{l}{antimicrobiana,}\tabcellsep extrato\tabcellsep \multicolumn{3}{l}{hidroalcóolico,}\\
\multicolumn{5}{l}{myrtaceae, ágarmueller hinton, quórum sensing.}\tabcellsep \tabcellsep \\
\tabcellsep \multicolumn{3}{l}{Introduction}\tabcellsep \tabcellsep \tabcellsep \\
he\tabcellsep genus\tabcellsep \multicolumn{2}{l}{Corynebacterium}\tabcellsep \multicolumn{2}{l}{belongs}\tabcellsep to\\
\multicolumn{7}{l}{Actinobacteriaclassrepresents a diverse group of}\\
\multicolumn{7}{l}{Gram-positive bacteria. (Ramoset al., 2014)}\end{longtable} \par
 
\caption{\label{tab_0}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_2}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{}
\end{longtable} \par
 
\caption{\label{tab_3}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{P{0.6002487562189055\textwidth}P{0.0014925373134328358\textwidth}P{0.0007462686567164179\textwidth}P{0.007711442786069652\textwidth}P{0.0029850746268656717\textwidth}P{0.004228855721393035\textwidth}P{0.035820895522388055\textwidth}P{0.18009950248756218\textwidth}P{0.004975124378109453\textwidth}P{0.007711442786069652\textwidth}P{0.0014925373134328358\textwidth}P{0.0024875621890547263\textwidth}}
\multicolumn{7}{l}{striatum causing infections in a surgical intensive}\tabcellsep 33. Desoti VC, Maldaner CL, Carletto MS, Heinz AA,\\
\multicolumn{6}{l}{care unit. Journal of Clinical Microbiology. 1996.}\tabcellsep Coelho MS, Piati D \& Tiuman TS. Triagem\\
\multicolumn{7}{l}{21. Camello TCF, Guaraldi ALM, Formiga LCD\&}\tabcellsep fitoquímica\tabcellsep e\tabcellsep avaliação\tabcellsep das\tabcellsep atividades\\
\multicolumn{7}{l}{Marques EA. Nondiphtherial Corynebacterium}\tabcellsep antimicrobiana e citotóxica de plantas medicinais\\
\multicolumn{7}{l}{species isolated from clinical specimens of patients}\tabcellsep nativas da região oeste do estado do Paraná.\\
\multicolumn{7}{l}{has great in a university hospital, Rio de Janeiro, Brazil.}\tabcellsep Arquivos de Ciências da Saúde da UNIPAR,\\
\multicolumn{5}{l}{projection Brazilian Journal of Microbiology. 2003. for different treatments,}\tabcellsep \multicolumn{2}{l}{including}\tabcellsep Umuarama, v. 15, n. 1, p. 3-13, jan./abr. 2011.\\
\multicolumn{7}{l}{antimicrobial. 22. Camello TCF. Corynebacterium spp. e outros micro-}\tabcellsep 34. Donlan RM \& Costerton JW. Biofilms: survival\\
\multicolumn{7}{l}{organismos corineformes de importância médica.}\tabcellsep mechanisms of clinically relevant microorganisms.\\
\multicolumn{7}{l}{Rio de Janeiro: Universidade do Estado do Rio de}\tabcellsep Clinical Microbiology Reviews. 2002; 15(2):167-193.\\
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\multicolumn{2}{l}{Médicas. 2008.}\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep Emerging Infectious Diseases, 2002.\\
\multicolumn{7}{l}{23. Campanile F, Carretto E,Barbarini D, Grigis A,}\tabcellsep 36. Euzéby JP, List of bacterial names with standing in\\
\multicolumn{7}{l}{Falcone M, Goglio A, Venditti M \& Stefani S. Clonal}\tabcellsep nomenclature\tabcellsep (LBSN).1997.\tabcellsep Disponível\tabcellsep em:\\
\multicolumn{3}{l}{multidrug-resistant}\tabcellsep \multicolumn{2}{l}{Corynebacterium}\tabcellsep \multicolumn{2}{l}{striatum}\tabcellsep http://www.bacterio.net/. Acesso em: 05 mar.2022.\\
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\multicolumn{7}{l}{Costa JDP. Tendências dos estudos com plantas}\tabcellsep 38. Fernandes TG, Mesquita ARC \& Ximenes EA,\\
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\multicolumn{7}{l}{Sabres e Práticas Educacionais. 2014. Acesso em:}\tabcellsep of Psidium guineense (Swartz) in combination with\\
\multicolumn{2}{l}{5 mar.2022.}\tabcellsep \tabcellsep \tabcellsep \tabcellsep \tabcellsep antimicrobial\tabcellsep agents\tabcellsep against\tabcellsep methicillin-\\
\multicolumn{7}{l}{25. Cone LA, Curry N, Wuestoff MA, O´Connell SJ \&}\tabcellsep resistant\\
\multicolumn{7}{l}{Feller JF. Septic synovitis and arthritis due to}\\
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\multicolumn{7}{l}{de Curso (Graduação em Biologia) -Curso de}\\
\multicolumn{7}{l}{Ciências Biológicas, Departamento de Ciências}\\
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\multicolumn{7}{l}{27. Costa ALP\&Silva Júnior ACS. Resistência}\\
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\multicolumn{3}{l}{of microbiology. 1995.}\tabcellsep \tabcellsep \tabcellsep \\
\multicolumn{7}{l}{30. Costerton W, Veeh R, Shirtliff M, Pasmore M, Post C}\\
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\multicolumn{7}{l}{study and control of chronic bacterial infections. The}\\
\multicolumn{7}{l}{Journal of Clinical Investigation. 2003 Nov. Erratum}\\
\multicolumn{6}{l}{in: The Journal of Clinical Investigation. 2007 Jan.}\\
\multicolumn{7}{l}{31. Creagh R, Saavedra JM, Rodriguez FJ, Rodriguez P}\\
\&\tabcellsep Merino\tabcellsep MD.\tabcellsep Pneumonia\tabcellsep \multicolumn{2}{l}{caused}\tabcellsep by\\
\multicolumn{7}{l}{Corynebacterium striatum in a patient with AIDS.}\\
\multicolumn{7}{l}{Enfermedades Infecciosas y Microbiología Clínica.}\\
\multicolumn{2}{l}{2000.}\tabcellsep \tabcellsep \tabcellsep \tabcellsep \\
\multicolumn{7}{l}{32. Dall L, Barnes WG \& Hurford D. Septicaemia in a}\\
\multicolumn{3}{l}{granulocytopenic}\tabcellsep patient\tabcellsep \multicolumn{2}{l}{caused}\tabcellsep by\\
\multicolumn{7}{l}{Corynebacterium striatum. Postgraduate Medical}\\
\multicolumn{2}{l}{Journal. 1989.}\tabcellsep \tabcellsep \tabcellsep \tabcellsep \end{longtable} \par
 
\caption{\label{tab_4}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2} \par 
\begin{longtable}{P{0.617536534446764\textwidth}P{0.11179540709812108\textwidth}P{0.12066805845511482\textwidth}}
SAMPLES\tabcellsep MDS 1961\tabcellsep MDR 1987\\
100\% crude extract\tabcellsep 13 mm\tabcellsep 14mm\\
obtained\tabcellsep \tabcellsep \\
Positive Control\tabcellsep 25mm\tabcellsep 40mm\\
Negative Control\tabcellsep -\tabcellsep -\\
Legends: Disk diffusion halo results\tabcellsep \tabcellsep \\
\tabcellsep Table 3\tabcellsep \\
MDS 1961\tabcellsep ATM\tabcellsep ATM+G\\
Gentamicine\tabcellsep 35mm\tabcellsep 15mm\\
Ampicilline\tabcellsep 41mm\tabcellsep 36mm\\
Imipenem\tabcellsep 53mm\tabcellsep 46mm\\
Erythromycin\tabcellsep 50mm\tabcellsep 34mm\\
Ciprofloxacin\tabcellsep 36mm\tabcellsep 22mm\\
\multicolumn{2}{l}{Legends: Results of disk diffusion halos of synergism in MDS}\tabcellsep \\
\tabcellsep Table 4\tabcellsep \\
MDR 1987\tabcellsep ATM\tabcellsep ATM+ G\\
Gentamicine\tabcellsep -\tabcellsep 19mm\\
Ampicilline\tabcellsep -\tabcellsep 24mm\\
Imipenem\tabcellsep -\tabcellsep 24mm\\
Erythromycin\tabcellsep -\tabcellsep 23mm\\
Ciprofloxacin\tabcellsep -\tabcellsep 23mm\\
\multicolumn{2}{l}{Legends: Results of disk diffusion halos of synergism in MDR}\tabcellsep \end{longtable} \par
 
\caption{\label{tab_5}Table 2}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{1} \par 
\begin{longtable}{P{0.44022801302931597\textwidth}P{0.060912052117263846\textwidth}P{0.10798045602605863\textwidth}P{0.19657980456026058\textwidth}P{0.04429967426710098\textwidth}}
Strain/PFGE-type*\tabcellsep Clinical sites\tabcellsep Antimicrobialresi stance profiles\tabcellsep \multicolumn{2}{l}{Biofilm on polyurethane catheter (CFU/ml) 37 o C 20 o C}\\
1987/I\tabcellsep BAL\tabcellsep MDR\tabcellsep 1.4x10 8\tabcellsep 3.3x10 8\\
1961/III**\tabcellsep Urine\tabcellsep MDS\tabcellsep 1.0x10 8\tabcellsep 1.4x10 6\\
\multicolumn{5}{l}{BAL, bronchoalveolar lavage; MDR, multidrug resistant; MDS, multidrug susceptible.; *, C. striatum strains}\\
partially studied by\tabcellsep \tabcellsep \tabcellsep \tabcellsep \end{longtable} \par
 
\caption{\label{tab_6}Table 1 :}\end{figure}
 			\label{foot_0}\footnote{\label{foot_0} Year 2023} 		 		\backmatter   			 \par
Complete atrioventricular block on isolated guinea pig heart induced by an aqueous fraction obtained from Psidium guajava L. leaf. Revista Brasileira de Farmacognosia. 2006. 			  			 			 			  				\begin{bibitemlist}{1}
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