The History of Methicillin-Resistant <i>Staphylococcus aureus</i> in Brazil

Andrade, Mariana Moreira; Luiz, Wilson Barros; da Silva Oliveira Souza, Rayane; Amorim, Jaime Henrique

doi:https://doi.org/10.1155/2020/1721936

Canadian Journal of Infectious Diseases and Medical Microbiology

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Abstract Introduction Conflicts of Interest Acknowledgments References Copyright Related Articles

Review Article | Open Access

Volume 2020 | Article ID 1721936 | https://doi.org/10.1155/2020/1721936

The History of Methicillin-Resistant Staphylococcus aureus in Brazil

Mariana Moreira Andrade,^1,2Wilson Barros Luiz,²Rayane da Silva Oliveira Souza,¹and Jaime Henrique Amorim^1,2

Academic Editor: Peter J. Weina

Received09 Mar 2020

Revised21 Jul 2020

Accepted24 Sept 2020

Published07 Oct 2020

Abstract

Since the emergence of MRSA in the 1960s, a gradual increase in infections by resistant bacteria has been observed. Clinical manifestations may vary from brand to critical condition due to host risk factors, as well as pathogen virulence and resistance. The high adaptability and pathogenic profile of MRSA clones contributed to its spread in hospital and community settings. In Brazil, the first MRSA isolates were reported in the late 1980s, and since then different genetic profiles, such as the Brazilian epidemic clone (BEC) and other clones considered a pandemic, became endemic in the Brazilian population. Additionally, Brazil’s MRSA clones were shown to be able to transfer genes involved in multidrug resistance and enhanced pathogenic properties. These events contributed to the rise of highly resistant and pathogenic MRSA. In this review, we present the main events which compose the history of MRSA in Brazil, including numbers and locations of isolation, as well as types of staphylococcal cassette chromosome mec (SCCmec) found in the Brazilian territory.

1. Introduction

Outbreaks of nosocomial and community-associated infections with methicillin-resistant Staphylococcus aureus (MRSA) have been reported as highly relevant worldwide. Attention to such pathogenic bacteria increased progressively since the first reports of resistance to antimicrobial agents. Penicillin was the first antibiotic to be introduced in clinical practice, in 1940. Shortly after, the selection of β-lactamase-producing bacteria marked the beginning of the first wave of antibiotic resistance in Staphylococcus aureus (S. aureus), which continues today [1].

The rapid spread of penicillin resistance briefly came to a halt after the introduction of the second-generation, semisynthetic methicillin in the 1960s. However, MRSA soon emerged in England, and only in 1981, this mechanism of resistance was unraveled: these strains harbored mutant penicillin-binding proteins, designated PBP-2a, which showed a reduced affinity for methicillin. PBP-2a is encoded by mecA, a gene located in the S. aureus chromosome [2]. Thereafter, new cases of hospital-acquired infections were reported in other countries such as Australia and the United States [3, 4]. Due to the use of new antibiotics, a slight decrease in MRSA prevalence was noticed. However, because of selective pressure, strains of S. aureus began to display a multidrug resistance profile. Cases of MRSA resistant to both β-lactams and gentamicin began to be reported in health units at the end of the 1970s [5–7]. In the 1980s, reports of outbreaks and infections caused by MRSA increased gradually.

The genetic profile of MRSA began to be clarified only after 1999, when the gene coding a mutated form of the PBP of the N315 resistant clone isolated in Japan, in 1982, was discovered [8]. In 2001, it was reported that such a sequence was inserted into a mobile cassette within the chromosomal DNA, called staphylococcal cassette chromosome mec (SCCmec). Thereafter, the first three isolates of SCCmec-containing S. aureus were used to designate the first three types of cassettes, in order of isolation [9]. To date, fourteen types of SCCmec were described in S. aureus [10, 11]. They were identified according to different combinations of components of their sequences, including the mec complex, the cassette chromosome recombinase (ccr) complex, and J regions [10, 12].

Brazil is the largest country in Latin America and the 5^th largest country in the world. Reviewing the history of MRSA in Brazil will help to better understand the spread of this important pathogen in Latin America, as well as in the new world. In Brazil, there are some epidemiological surveillance systems of resistant bacteria which do not work at a national level [13, 14]. However, in 2018, a program named PAN-BR (National Action Plan for the Prevention and Control of Antimicrobial Resistance in Brazil) was developed [15]. Although it is not specific for the control and monitoring of MRSA, it was designed based on objectives pre-established by organizations, such as the World Health Organization, and aims to apply strategies for the prevention, control, and monitoring of infections caused by antimicrobial-resistant pathogens, including MRSA. One of the strategic objectives of PAN-BR is “to strengthen knowledge and the scientific basis through surveillance and research” [15]. Therefore, the data provided in this review will contribute to the performance and development of this program, as well as other strategic action plans suggested by the Agência Nacional de Vigilância Sanitária (ANVISA) for the prevention and control of resistance in the country [16].

In this review, we present the history of MRSA in Brazil. Numbers and locations of isolation, as well as types of SCCmec found in the Brazilian territory, are discussed in sections by decade, since the 1980s. As inclusion criteria, all published studies reporting the isolation of MRSA from human samples in Brazil were used in this review. In addition, the prevalence of MRSA by region, as well as the frequency types of SCCmec, is shown. Text sections are concentrated on a critical review of the main events which compose the history of MRSA in Brazil. The articles were searched in MEDLINE/PubMed and SciELO databases by using the keywords “MRSA Brazil.” We found 597 articles, and after applying exclusion and inclusion criteria, 199 articles were selected.

1.1. The 1980s

The first cases of MRSA in Brazil were reported in 1987 in Rio de Janeiro, and although they were not published, these events were mentioned by Ramos et al. in 1999 [17]. Such publication was the only one to report MRSA in the 1980s in Brazil, as shown in Figure 1. The incidence of MRSA was reported to be approximately 8%. Variances in the occurrence of MRSA isolates were reported in the following two years: with a decrease of 7.2% in 1988 and the following increase to 33% in 1989 [17]. From 1987 to 1994, Tresoldi and colleagues reported that 257 of 421 S. aureus isolates were MRSA. However, although S. aureus is to be isolated with the highest frequency (20.9%), MRSA isolates in this study were reported only in the 1990s by Tresoldi and colleagues [18].

After the global spread of MRSA, new antimicrobial agents, such as Synercid, daptomycin, linezolid, and tigecycline, were introduced during the treatment of infections caused by methicillin-resistant bacteria, which may have contributed to broadening mechanisms of multidrug resistance [19–23]. In a study published in 1989, which involved 106 strains of S. aureus from 21 countries, including Brazil, 90% of the samples were shown to be multiresistant to antimicrobial agents. Relevantly, the Brazilian strains showed resistance to fourteen antibiotics in this same study [24].

1.2. The 1990s

The first three waves of resistance of S. aureus of antimicrobial drugs were characterized based on its spread specifically in health care environments. The first wave was characterized by the emergence of strains capable of producing penicillinase, which inactivates penicillin. The emergence of MRSA strains marked the second wave. The disappearance of the archaic clone and the raise of new clones marked the third resistance wave [25]. The fourth wave has been marked by the introduction of community-acquired MRSA (CA-MRSA). However, the hospital clones were still prevalent in Brazil in the 1990s [26]. Compared to the 1980s, the number of occurrences of MRSA increased gradually in different health care facilities in Brazil [17, 27–30]. The spread of MRSA continued to be reported in different hospitals in São Paulo [31, 32]. Restriction fragment length polymorphisms (RFLP) showed the spread of MRSA clones, which indicated that microbial transfer was occurring possibly due to an interhospital connection involving patients and health workers [31, 32]. Furthermore, 91 MRSA isolates were found as microbiota composing of hospital food handlers in Teresina [33]. Such results indicated that transmission by physical contact was a determining factor of the occurrence for nosocomial outbreaks caused by both susceptible and resistant S. aureus [34, 35].

The theory of interhospital connection was reinforced when the same clone of MRSA was isolated from different locations at the same hospital in Joao Pessoa, in 1992 [36] and thereafter was found in the Campinas University Hospital, in two different studies [18, 37]. Such a clone was shown to be the same one found by Sader et al. in São Paulo, in 1993 and 1994 [31, 32]. The spread of MRSA was also shown to happen in an intrahospital way, as reported by a study carried out in Rio de Janeiro, in which propagation of a single virulent multidrug-resistant clone within the same hospital caused a relevant number of deaths [38].

A study carried out in five Brazilian cities showed in a systematic way that the interhospital communication was not restricted to nearby areas due to the spreading of bacteria with the same genetic pattern to different regions of the country [39]. Such a genetic pattern was identified by pulsed-field gel electrophoresis (PFGE) of chromosomal DNA. The epidemic MRSA was named as Brazilian epidemic clone (BEC) and became one of the five most-discussed MRSA clones around the world [28, 39]. Epidemiological studies aiming to investigate the spread of BEC were carried out in the 1990s in both Brazil and other countries, such as Portugal, Argentina, Chile, and Italy [28, 40–42]. MRSA strains containing both the polymorphic form type XI of the mec gene and type B of the Tn554 gene were classified as the A genetic pattern of BEC (BEC A). Although this pattern has been identified more frequently, some studies have isolated MRSA that differed minimally from BEC A. Such variants, including BEC A, were grouped as the Brazilian epidemic clonal complex (BECC) [30, 43].

After such reports, BEC was massively searched in several hospitals of Brazil evidencing its wide geographical distribution and predominance [42, 44]. The study by Oliveira et al. showed that from 83 MRSA isolated in 14 states in Brazil, 78.3% contained the mecA gene with polymorphism XI and Tn554 type B (BEC A). Moreover, isolates were shown to be multiresistant to drugs. These results clearly showed the spread of the BEC and its variants in Brazil [45, 46].

Genetic patterns of BECC isolates were shown to be diverse regarding their antimicrobial resistance and pathogenicity such as to be capable of forming biofilm and adhere and invade airway epithelial cells [30, 47]. The multiresistance is another common feature among BECC isolates. They carry structures such as plasmids and transposons that are responsible for resistance to other drugs within the cassette. In addition to methicillin, strains may be resistant to clindamycin, erythromycin, cephalothin, gentamicin, ciprofloxacin, sulfamethoxazole-trimethoprim, and chloramphenicol [39]. These strains have also shown high-level resistance to mupirocin. It is due to the insertion of the PMG1 plasmid, which carries a novel ileS gene that encodes a novel isoleucyl-tRNA synthetase, homolog to antibiotic target [48–50]. Such multiresistance presented by MRSA and the high frequency of nosocomial infections are associated with risk factors such as insertion of classic pathogens into host microbiota, prolonged hospitalization, and misuse of antibiotics [51–53]. This ability to adapt is probably related to genetic diversity into the BECC reported in different published studies [54, 55]. These reports indicated a relevant genetic diversity into the BECC at the ending of the 1990s.

Therefore, other clones or subclones were reported in Brazilian hospitals. The first report of non-BEC MRSA, which presented different genetic patterns from that characterized by BEC, such as mecA type III and Tn544 type B polymorphism, was carried out in 1996 [56]. Although there were reports of diversity in genetic profiles, the BEC A was still prevalent among the isolates, as occurred in Teresina, Rio de Janeiro, Uberlandia, and Belem [30, 49, 57, 58]. However, the type of SCCmec was not yet known. In the 2000s, it was reported that the BEC clone carries the SCCmec type III. Such a cassette type was thus shown to be the most frequent in Brazil in the 1990s [55, 59]. The number of MRSA isolation reports published in the 1990s is shown in Figure 2.

1.3. The 2000s

In the 2000s, MRSA remained a concern in Brazil, with new records in the prevalence of resistant bacteria, with an increase in the number of cases of infections [60]. Figure 3 shows the number of reports by location published in this decade. Strains of the BECC continued to be predominant in Brazilian hospitals until a certain moment [29, 61–66]. However, over the decade, other international (non-BEC) clones were imported and started to be reported in different regions of Brazil [67, 68]. Such international clones carried other types of cassettes and were named according to the location they were isolated for the first time [69]. Some of these clones, although considered pandemic, were reported less frequently in Brazil, such as the Iberian clone (SCCmec type I); the Hungarian clone (SCCmec type III); Cordobes/Chilean clone (SCCmec type I); an MRSA clone carrying SCCmec type V [69–71]. However, other clones considered to be of great relevance in a global context were reported in a larger frequency. One of these clones was the New York/Japan clone, which is also classified as HA-MRSA (hospital-acquired MRSA) but carrying SCCmec type II. Such a clone was initially isolated in a lower frequency with regard to the BEC. Nevertheless, it was gradually spread in the hospital environment [47, 65, 71–73]. Its fixation in Brazilian hospitals was a milestone in history because, in addition to its spread, the New York/Japan clone presented resistance to β-lactam antibiotics, ciprofloxacin, erythromycin, and clindamycin, hindering the treatment of patients [74].

The pediatric clone, which is of great world relevance, had also an important role in the history of MRSA in Brazil. It carries the SCCmec type IV, which is commonly present in strains of CA-MRSA. However, although not classified as HA-MRSA, it was reported in a relevant number of nosocomial infections. Its profile of resistance diverges from most of HA-MRSA, presenting a susceptibility to a wide range of antimicrobial agents, except β-lactams. Although non-multidrug resistant, the pediatric clone began to exhibit important virulence factors. Isolates obtained in different cities showed the capacity of forming biofilm and of producing enterotoxins. Such virulence factors increase the bacterial pathogenicity, exacerbating infections mainly in immunocompromised, children, and elderly [47, 72, 75, 76].

The pediatric clone has similarities and divergences with another clone that also gained prominence: the Oceania Southwest Pacific (OSP) clone. In common, both carry SCCmec type IV and are typically non-multiresistant. However, different from the pediatric clone, the OSP clone was shown to cause infections in the community [77]. Community MRSA strains were first reported in western Australia in the early 1990s [78]. Such strains were initially devoid of Panton-Valentine leucocidin (PVL), but subsequent cases of community MRSA were now recorded as PVL positive [79]. Such a clone was first described in Brazil as CA-MRSA before being isolated from patients with skin and soft tissue infections which were not exposed to classical risk factors for nosocomial infection [80]. Several infections caused by CA-MRSA ranging from mild [81–85] to severe [86–88] were reported in Brazil in the 2000s. Although the properties of CA-MRSA appear to make it less aggressive than hospital clones, the OSP clone presents virulence factors involved in the high pathogenicity, such as the PVL, which kills immune cells and induces tissue necrosis [82, 83, 86, 87, 89, 90]. Although originally found in MRSA SCCmec type IV, PVL has also been reported in strains with other types of cassettes mostly present in HA-MRSA strains, such as BEC, due to a horizontal transfer of genes [29, 63, 91, and 92]. Such horizontal transference indicates contact between CA and HA-MRSA. Thus, CA-MRSA was identified in health units, and HA-MRSA clones were identified in the community [74, 93, and 94]. As a result, in addition to the presence of PVL in clones that at the time were considered unusual carriers, the ability to form biofilms was spread among the various types of MRSA [92, 95]. In addition to the spread of virulence factors, genes of resistance to antimicrobial drugs were transferred to non-multiresistant clones, which resulted in strains with a profile of pathogenicity and resistance [75, 89, and 96].

The spread of different clones was observed in the mid-2000s in Brazil [92, 97]. Different clones of MRSA carrying SCCmec type IV, including CA-MRSA, were detected in 19 of 20 MRSA isolated from patients with nosocomial infections in a hospital of Rio de Janeiro. In Porto Alegre, moreover to the isolation of the OSP clone, the pediatric clone was shown to be circulating [71, 96, 98, and 99]. In São Paulo, a profile similar to CA-MRSA was identified as the cause of 95% of bloodstream infections. Such reports indicated the adaptive capacity of CA-MRSA to the hospital environment [75].

An important study was published in 2012 describing samples collected in the south, southeast, and northeast of the country and revealed the most frequent cassettes circulating in Brazil. The cassettes were identified based on the detection of clonal complexes (CC) and the most common were shown to be SCCmec types II, III, and IV [47, 64, 65, 72, 100, and 101]. These cassettes were reported gradually during the decade of 2000, showing that there was an evolution, adaptation, and propagation of different clones of MRSA in Brazil.

1.4. The 2010s

In the 2010s, MRSA remained being increasingly reported in Brazil, as shown in Figure 4. The most common clones in the hospital environment continued to be those carrying the SCCmec types II, III, and IV [14, 65, 73, 102, 103]. However, SCCmec type II, in contrast to the last decade, was reported as one of the most prevalent clone [103–109]. Relevantly, the New York/Japan clone, which carries SCCmec type II, was shown to become resistant to daptomycin, tigecycline, and vancomycin [67, 110]. In addition, such a clone was shown to become capable of producing α-hemolysin and PVL and forming a biofilm [14, 104, 105]. Thus, multiresistance and virulence remained evolutionary events among MRSA clones. As a further example of adaptation and evolution, in 2011, a CA-MRSA strain was shown to have acquired the vanA gene, which confers resistance to vancomycin. This was the first CA-MRSA reported being resistant to this antimicrobial agent [111].

Clones carrying the SCCmec type IV continued to be the main producers of PVL and biofilms [112, 113]. These virulence factors were involved in infections reported in both hospital and community environments due to a horizontal transfer of genes among CA-MRSA and HA-MRSA strains. In addition to the New York/Japan clone, the production of biofilms and PVL began to be seen in more unusual and less frequent clones, such as those carrying SCCmec types V and I [114, 115]. These types of cassettes, as well as the SCCmec type VI, UK/EMRSA-3, Hungarian, and Iberian clones, were identified in the history of MRSA in Brazil at a low frequency [104, 116–119].

The last relevant chapter of the history of MRSA in Brazil also involves SCCmec V. An unusual genetic profile called clonal complex 398 (CC398) began to be reported. Such variants may carry either type IV or type V cassettes. This complex is directly associated with livestock and thus called LA-MRSA (livestock-associated methicillin-resistant Staphylococcus aureus). This type of MRSA emerged the first time from animal infection samples, in 1972 [120], but was subsequently isolated from humans, especially those who had direct access to animals [121–123]. In 2010, it was first isolated in Brazil from a patient with cystic fibrosis who had contact with animals from the farm [124]. Later, between 2011 and 2016, six clones of the same complex were isolated from children in Rio de Janeiro [125]. However, such isolates were not classified as LA-MRSA because the children did not present the typical risk factors for the acquisition of this lineage, which includes the previous contact with animals. These results showed that clones of this lineage are not restricted to animals and have adapted to a new kind of host.

1.5. Clinical and Epidemiological Relevance

The 199 documented articles reflect the high and gradual incidence of pandemic clones disseminated in Brazil and the increase in the proportion of infections that result in different clinical manifestations. Although it is currently part of the PAN-BR, no survey has yet been made of the MRSA rates recorded since its emergence in Brazil until today [15]. However, Brazil is part of an antimicrobial surveillance organization that acts at a global level, called SENTRY, which recorded that 38.7% of MRSA out of 17474 samples of S. aureus collected over the 20-year interval were from Latin America, including Brazilian sampling [126].

A quantitative survey of reports of MRSA infections specifically in Brazil collaborates to point out how emergency it is to apply the objectives of national epidemiological inspection and control programs [15]. Such a survey based on the regions of Brazil evidences which areas are most affected and which increase the country’s epidemiological rates. Table 1 shows all the cities in Brazil and its respective references that were reported through publications that involved isolating MRSA from human samples. It is evident that the spread of clones and the consequences they bring to patients were gradually increased over the years and that all regions of the country have already been notified, with the southeast region being the most affected in all decades, followed by the south and northeast (Figure 5(a)). The high number of MRSA notifications in these regions was probably due to the fact that they are the most populated in Brazil, while the centralwest and north regions have lower demographic density [236]. In all regions, SCCmec type IV is the most prevalent, followed by III, II, and I, demonstrating that the clones that typically circulate in the community are the most prevalent in the country, followed by hospital clones (Figure 5(b)). Such data show how these virulent, highly adaptable, and multidrug-resistant clones pose risks to the population and show that such a survey contributes to the development of prevention and control assistance plans recently adopted in the country.

(a)

(b)

1.6. Final Considerations

Considering case reports and field research included in this review, it is clear that MRSA is now present in the five regions of Brazil. It is also clear that Brazil has a large genetic diversity of MRSA, including multidrug-resistant and high virulent strains. Such diversity may increase if new SCCmec and variants are imported. In addition, it is important to note that the data indicated in this review are relevant but still limited concerning the subcontinental size of Brazil. Limitations may include an insufficient number of studies due to low government investment in research, lack of access to health services for the vulnerable population, and application of empirical antibiotic therapy ignoring established protocols, which undoubtedly results in underreporting of a relevant number of cases. This review reinforces problems related to the ability of bacteria to become resistant to antibiotics and their potential for spread, usually occurring in epidemic waves initiated by one or a few successful clones. Moreover, it contributes to an epidemiological study by mapping the spread of MRSA in Brazil, as there is still no monitoring system for these resistant strains or a specific antimicrobial surveillance system in Brazil. Strategies of control and monitoring should be increased in hospital and community environments to avoid the advance of spreading of successful clones as well as exporting or importing new strains of MRSA to Brazil.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors are thankful to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the mastering fellowship of Mariana Moreira Andrade.

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Copyright © 2020 Mariana Moreira Andrade et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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