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Silva, V.;  Monteiro, A.;  Pereira, J.E.;  Maltez, L.;  Igrejas, G.;  Poeta, P. Methicillin-Resistant Staphylococcus Aureus Clones. Encyclopedia. Available online: https://encyclopedia.pub/entry/29114 (accessed on 23 November 2024).
Silva V,  Monteiro A,  Pereira JE,  Maltez L,  Igrejas G,  Poeta P. Methicillin-Resistant Staphylococcus Aureus Clones. Encyclopedia. Available at: https://encyclopedia.pub/entry/29114. Accessed November 23, 2024.
Silva, Vanessa, Andreia Monteiro, José Eduardo Pereira, Luís Maltez, Gilberto Igrejas, Patrícia Poeta. "Methicillin-Resistant Staphylococcus Aureus Clones" Encyclopedia, https://encyclopedia.pub/entry/29114 (accessed November 23, 2024).
Silva, V.,  Monteiro, A.,  Pereira, J.E.,  Maltez, L.,  Igrejas, G., & Poeta, P. (2022, October 13). Methicillin-Resistant Staphylococcus Aureus Clones. In Encyclopedia. https://encyclopedia.pub/entry/29114
Silva, Vanessa, et al. "Methicillin-Resistant Staphylococcus Aureus Clones." Encyclopedia. Web. 13 October, 2022.
Methicillin-Resistant Staphylococcus Aureus Clones
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This entry is adapted from the peer-reviewed paper 10.3390/pathogens11101110

Methicillin-resistant Staphylococcus aureus (MRSA) belonging to several clonal complexes are widely distributed throughout the world. MRSA poses a serious threat to public health worldwide, due to the rapid spread and diversification of pandemic MRSA clones with increasing virulence and antimicrobial resistance.

MRSA animals humans Staphylococcus aureus

1. Introduction

Staphylococcus aureus persistently or intermittently colonizes the nasal mucosa in approximately 30% of healthy adults [1]. Individuals naturally colonized by S. aureus have an increased risk of infection by this bacterium since its presence does not cause a detectable immune response in the host. In addition, these individuals are an important source of transmission of the microorganism to other people, which usually occurs through direct contact with the skin (Lee et al., 2018).
Antimicrobial resistance is a global public health problem that must be addressed by health authorities worldwide. Estimates from the European Union/European Economic Area show that each year more than 670,000 infections are due to antimicrobial-resistant bacteria with approximately 33,000 deaths [2].
The current methicillin-resistant Staphylococcus aureus (MRSA) situation in Europe has a prevalence of <5% in 9 European Union countries and >25% for 10 countries in the same region, namely Portugal [2]. In the hospital sector, resistant microorganisms deserve special attention. MRSA is one of the most frequent microorganisms that cause infections associated with the hospital environment [3]. In that same year, S. aureus were responsible for 18.5% of pneumonia episodes and 12% of bloodstream infections acquired in intensive care units in European hospitals. Of the S. aureus identified, 20% were MRSA [4]. In Portugal, 13.8% of pneumonia cases and 9.7% of bloodstream infections were caused by S. aureus strains [4]. The great variability in the rates of infections associated with the hospital environment in the various European countries is partly related to the different diagnostic methods. However, these data are of great importance as they alert to the need to implement measures to control and prevent the emergence and spread of resistant organisms.
Initially, MRSA infections were predominantly associated with the hospital environment, occurring mostly in hospitalized patients or patients who attended that environment. Therefore, during the 1960s−1970s, they were called HA-MRSA (Gajdács, 2019). However, in the late 1990s, MRSA infections began to appear in the community in people with no contact with the hospital environment and were therefore called CA-MRSA (Turner et al., 2019). These MRSA strains (HA-MRSA and CA-MRSA) belong to distinct genetic lineages and have some differences. HA-MRSA strains are generally more resistant to numerous drugs and have larger Staphylococcal Cassette Chromosome mec (SCCmec) types I, II and III. In contrast, CA-MRSA strains often have smaller SCCmec elements, usually types IV and V, and are not as resistant [5]. However, these strains appear to be more virulent due to the expression of virulence factors that increase their pathogenic potential [6], being one of the most frequent etiological agents of skin and soft tissue infections [7].
HA-MRSA are nosocomial and arise from wounds of infected patients, catheters and prolonged hospitalization, but also from the skin of healthy carriers [8]. In the late 1990s, MRSA infections began to appear in the community in people with no contact with the hospital environment [9]. The community-associated MRSA (CA-MRSA) has become a point of concern since these strains are associated with higher levels of virulence and disseminate fast, thus affecting seemingly healthy individuals [10]. In recent years, numerous MRSA strains have been isolated from different animal species, especially pigs, in many countries and were called livestock-associated MRSA (LA-MRSA) [11][12][13]. However, in most cases, MRSA colonized the animal host asymptomatically [14]. Most LA-MRSA belong to the genetic lineage clonal complex (CC) 398. Strains belonging to this same genetic lineage have been found in people who have direct contact with livestock [12][15][16]. In addition to this, vancomycin resistance has become a major concern within the scientific community. This adaptation arises from the acquisition of accessory components, in this case, the vanA gene [17], leading to the emergence of Vancomycin-resistant S. aureus (VRSA). This genetic adaptation is extremely important since there is a wide dependence on this antibiotic in the treatment of infections caused by MRSA. Vancomycin resistance in S. aureus tends to appear after prolonged or repeated periods of treatment with vancomycin, in a phenomenon called heteroresistance, where multiple mutations occur conferring different degrees of resistance to the antibiotic [18].
Currently, there has been an increase in the number of nosocomial infections by CA-MRSA; HA-MRSA clones have been responsible for infections in the community and LA-MRSA clones have been detected in healthy humans and human infections. Apparently, these clones have the ability to cross physical barriers, adapting easily. This change in the epidemiology of MRSA has raised serious concern as it becomes difficult to define the boundary between hospital–community-livestock transition. 

2. Human-Associated Methicillin-resistant Staphylococcus Aureus 

The control and prevention of infections by S. aureus strains can be carried out through rapid molecular typing that, simultaneously allows us to understand the transmission mechanism of this microorganism. MRSA typing can be performed through phenotypic or molecular characterization. In fact, the identification of endemic MRSA strains and strains responsible for disease outbreaks has become possible due to the improvement in molecular characterization techniques, which have allowed for a greater discrimination of MRSA clones [19]. Multilocus sequence typing (MLST) consists of the analysis of nucleotide sequences of internal fragments of seven housekeeping genes present in S. aureus. These genes are highly conserved since they encode enzymes necessary for the metabolism of the bacteria. The sequence of each locus is assigned an allele identification number based on its similarity to known alleles, and the combination of these seven alleles generates a sequence type (ST). When there are single nucleotide polymorphisms in fewer than three genes, the STs are considered closely related, and can be grouped under the same clonal complex (CC) [20]. The spa-typing technique is also widely used and it is based on the amplification and sequencing of the 24 bp X polymorphic zone of the spa gene, which encodes protein A, containing a variable number of repeats [21]. These repetitions are contrasted with those already known on an online server and, thus, the number associated with that strain of S. aureus can be determined.
MRSA strains known today resulted from processes of genetic recombination of pre-existing strains. Throughout this process of evolution, there was a selection of some advantageous characteristics that made these strains successful in a given geographic location [22][23]. Furthermore, the predominant lineage in that geographic location, after reaching a peak of dominance, tends to decline and later disappear, being replaced by a new lineage [24]. This clonal replacement process has been observed worldwide [25]. The acquisition of different types of Staphylococcal Cassette Chromosome mec (SCCmec) by methicillin-susceptible S. aureus (MSSA) strains of different genetic origins underlies the origin of MRSA pandemic clones such as those belonging to CC8: Archaic (ST250-I), Iberian (ST247-I), Brazilian (ST239-III) and USA300 (ST8-IV); and clones belonging to CC5, CC22, CC30 and CC398: New York/Japan (ST5-II), EMRSA-15 (ST22-IV), EMRSA-16 (ST36-II) and LA-MRSA (ST398-V), respectively [19][26].
MRSA infections in Europe in the early 1960s were limited to hospital outbreaks caused primarily by S. aureus with the phage 83A (later designated ST250). This clone was designated Archaic and was gradually replaced in the following decades by five other prevalent clones: CC5, CC8, CC22, CC30 and CC45 [6]. Of these, clones CC5 and CC8 are the most prevalent worldwide and comprise several different Sequence Types (ST’s) being widely distributed throughout the world (Table 1) [19].
Table 1. Pandemic MRSA lineages and their worldwide distribution [27][28].
Clonal Complex (CC) Sequence Type (ST) Spa-Type SCCmec Type Clone Geographic Distribution
CC1 ST6 t304 and variants IVa Middle East The Middle East and Europe
CC5 ST5 t001, t002, t003, t010, t045, t053, t062, t105, t178, t179, t187, t214, t311, t319, t389, t443 II New York/Japan, USA100 United States, Japan, Europe, Australia and South Korea
t001, t002, t003,
t010, t045, t053, t062, t105, t178, t179, t187, t214, t311, t319, t389, t443		 IV Pediatric/USA800 South America and Europe
CC8 ST239 t030, t037, t234, t387, t388 III Brazilian/Hungarian Europe, South America, Asia and Africa
ST247 t008, t051, t052, t054, t200 I Iberian/EMRSA-5 Europe and the United States
ST250 t008, t009, t194 I Archaic Worldwide
CC22 ST22 t005, t022, t032, t223, t309, t310, t417, t420 IV EMRSA-15 Europe, Australia and Canada
CC30 ST36 t018, t253, t418, t419 II EMRSA-16, USA200 Europe, North America, and Australia
ST30 t012, t019, t1143, t300 IV USA1100/South West Pacific America, Australia and the Western Pacific
CC45 ST45 t004, t015, t026, t031, t038, t050, t065, t204, t230, t390 IV Berlin, USA600 Europe and the United States
ST80 ST80 t044, t203, t131, t1028, t1200 IV European Europe, North Africa and the Middle East
  ST93 t3949 t202 t15361 t4699 t17089 t16949 t17272 IV Queensland Australia
Abbreviations. ST: sequence type; CC: clonal complex; SCCmec: Staphylococcal Cassette Chromosome mec.
Currently, Portugal has one of the highest nosocomial prevalence rates in Europe. Most HA-MRSA infections in Portugal are associated with EMRSA-15, the Iberian clone, and New York/Japan clones [29][30]. The Iberian clone was first described in Spain in 1989 and, since then, it has been reported in several countries, namely in Portugal. This, and the Portuguese clone (ST239-III variant) were the most prevalent clones of HA-MRSA from the mid-1980s to the beginning of the following decade [31][32]. The Pediatric clone was also mentioned for the first time in 1992, in a pediatric hospital in Portugal and was later found in Poland, the United States, Argentina and Colombia. Currently, the Clone New York/Japan is the most prevalent HA-MRSA clone in the country [19].
In addition to these, other clones such as the Brazilian (first described in 1992, in Brazil) have been identified worldwide. The New York/Japan clone, in turn, was identified as the dominant MRSA in hospitals in the metropolitan areas of New York, Pennsylvania, New Jersey and Connecticut in the United States, and also in a hospital in Tokyo, Japan [33]. However, in the last decade, there was a major shift in dominant MRSA clones from the New York/Japan to the USA300 clone [33]. In the United Kingdom, EMRSA-15 and EMRSA-16 were identified as endemic in hospitals in that region during the 1990s [34]. The same was true in several other European countries. Currently, EMRSA-15 is the dominant strain in UK hospitals, emphasizing the fact that CA-MRSA clones are widely disseminated in the hospital setting [9].

3. Animal-Associated Methicillin-resistant Staphylococcus Aureus 

In addition to humans, MRSA also colonizes and infects animals. MRSA colonization and infection have been reported in a variety of animals, from domestic animals to farm animals. The indiscriminate use of antimicrobial agents in animal production and other agricultural activities has largely contributed to the distribution of MRSA among animals [35], thus, affecting more than 40% of pigs, 20% of cattle and up to 90% of turkey farms as demonstrated by a study carried out in Germany [36]. In Europe, LA-MRSA mostly belongs to the ST398 of the CC398, presenting itself as the largest reservoir of MRSA [37]. First recognized in 2005, LA-MRSA CC398 strains are the main type of MRSA reported in swine internationally and it is conceivable that this strain, which originated in swine, was later dispersed to other animals, such as cattle, horses and poultry [37][38][39][40][41]. While CC398 is the dominant lineage in livestock in Europe, other STs are predominant in other geographic locations. The dominant MRSA in livestock in Asia is CC9 [42]. Nevertheless, a wide range of genetic lineages have been reported in livestock such us CC1, CC5, CC9, CC45, CC97 and CC398 [43]. Figure 1 shows the distribution of MRSA CCs most commonly found in livestock and pets. MRSA strains often carried the mecA gene which confers resistance to methicillin but, the divergent mecA variant, mecC gene, has been increasingly reported in animals since it was first recognized in 2011 [44]. mecC-MRSA has been found in humans and animals, including pets, wild animals and livestock [11][45][46]. Most of the mecC-MRSA found among livestock belong to CC130 or CC425 [28]. Generally, MRSA clones of pets differ from those in livestock and meat production animals [47]. In cats and dogs, the most predominant MRSA lineage is ST22-IV (EMRSA-15) in Europe while in North America and Japan is ST5 [48][49]. As for horses, the most common lineages are ST8 and ST398 [41][50].
Pathogens 11 01110 g001 550
Figure 1. Distribution of the most frequent MRSA and MSSA clones in pets and livestock.

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Subjects: Microbiology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Vanessa Silva
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Andreia Monteiro
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José Eduardo Pereira
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Luís Maltez
,
Gilberto Igrejas
,
Patrícia Poeta
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