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Polyclonal non multiresistant methicillin resistant Staphylococcus aureus isolates from clinical cases of infection occurring in Palermo, Italy, during a one-year surveillance period.

Mammina C, Calà C, Bonura C, Di Carlo P, Aleo A, Fasciana T, Giammanco A, EPI-MRSA Working Gro - Ann. Clin. Microbiol. Antimicrob. (2012)

Bottom Line: SCCmec type IV was found in all isolates.PVL was detected in one ST22 isolate.MLVF identified 31 different patterns, some subtype clusters ranging in size between two and 22 isolates.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Sciences for Health Promotion G, D'Alessandro, University of Palermo, Palermo, Italy. caterina.mammina@unipa.it

ABSTRACT

Background: The evolving epidemiology of methicillin resistant Staphylococcus aureus (MRSA) is characterized by the emergence of infections caused by non multiresistant MRSA carrying staphylococcal chromosomal cassette (SCC)mec IV or V in the healthcare settings. A molecular epidemiological analysis of non multiresistant MRSA isolates from four acute general hospitals was performed in Palermo, Italy, during a one year period.

Methods: For the purpose of the study, MRSA isolates were defined as non multiresistant when they were susceptible to at least three classes of non β-lactam antibiotics. Seventy-five isolates were submitted to antimicrobial susceptibility testing, multilocus sequence typing (MLST) and polymerase chain reaction (PCR) for SCCmec, accessory gene regulator (agr) groups, arginine catabolic mobile element (ACME) and Panton Valentine leukocidin (PVL) toxin genes. For epidemiological typing, Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) was performed on all isolates and pulsed field gel electrophoresis (PFGE) on ST8 isolates.

Results: Non multiresistant MRSA isolates were isolated from all hospitals. Resistances to ciprofloxacin, macrolides and tetracycline were the most prevalent. MLST attributed 46 isolates with ST22, 13 with ST8, eight with ST1, three with ST50 and three with ST398. SCCmec type IV was found in all isolates. PVL was detected in one ST22 isolate. All isolates tested negative for the ACME element. MLVF identified 31 different patterns, some subtype clusters ranging in size between two and 22 isolates. The closely related PFGE patterns of the ST8 isolates differed from USA300.

Conclusions: A polyclonal circulation of non multiresistant MRSA along with blurring of boundaries between healthcare associated (HA)-MRSA and community associated (CA)-MRSA appear to be occurring in our epidemiological setting. A better understanding of spread of MRSA with the support of molecular typing can provide invaluable information in the epidemiological, microbiological and clinical fields.

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Dendrogram showing similarity between the 31 different Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) patterns. Sequence type (ST) is also indicated.
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Figure 1: Dendrogram showing similarity between the 31 different Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) patterns. Sequence type (ST) is also indicated.

Mentions: To obtain a more discriminative picture of the MRSA strains in the four hospitals under study and highlight possible subtype clusters of epidemiological interest, all MRSA were submitted to MLVF. This fingerprinting technique allowed for the identification of 31 different banding patterns among the 75 isolates under study (Table 2 and Figure 1). Some subtype clusters were also recognized ranging in size between two and 22 isolates. In particular, the largest subtype cluster, including 22 isolates, was characterized by the MLVF pattern 004 and was found within the ST22-IVa isolates. It comprised isolates with six different antibacterial susceptibility patterns from all the participating hospitals. Moreover, two smaller clusters, grouping seven and six isolates, respectively, were identified among the ST22-IVb isolates: the first one, characterized by the MLVF pattern 023 contained isolates from three out of the four hospitals under investigation, whereas the second one with the MLVF pattern 073 consisted of isolates that, except for one of them, had been isolated from patients attending different wards of the same hospital.


Polyclonal non multiresistant methicillin resistant Staphylococcus aureus isolates from clinical cases of infection occurring in Palermo, Italy, during a one-year surveillance period.

Mammina C, Calà C, Bonura C, Di Carlo P, Aleo A, Fasciana T, Giammanco A, EPI-MRSA Working Gro - Ann. Clin. Microbiol. Antimicrob. (2012)

Dendrogram showing similarity between the 31 different Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) patterns. Sequence type (ST) is also indicated.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3473248&req=5

Figure 1: Dendrogram showing similarity between the 31 different Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) patterns. Sequence type (ST) is also indicated.
Mentions: To obtain a more discriminative picture of the MRSA strains in the four hospitals under study and highlight possible subtype clusters of epidemiological interest, all MRSA were submitted to MLVF. This fingerprinting technique allowed for the identification of 31 different banding patterns among the 75 isolates under study (Table 2 and Figure 1). Some subtype clusters were also recognized ranging in size between two and 22 isolates. In particular, the largest subtype cluster, including 22 isolates, was characterized by the MLVF pattern 004 and was found within the ST22-IVa isolates. It comprised isolates with six different antibacterial susceptibility patterns from all the participating hospitals. Moreover, two smaller clusters, grouping seven and six isolates, respectively, were identified among the ST22-IVb isolates: the first one, characterized by the MLVF pattern 023 contained isolates from three out of the four hospitals under investigation, whereas the second one with the MLVF pattern 073 consisted of isolates that, except for one of them, had been isolated from patients attending different wards of the same hospital.

Bottom Line: SCCmec type IV was found in all isolates.PVL was detected in one ST22 isolate.MLVF identified 31 different patterns, some subtype clusters ranging in size between two and 22 isolates.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Sciences for Health Promotion G, D'Alessandro, University of Palermo, Palermo, Italy. caterina.mammina@unipa.it

ABSTRACT

Background: The evolving epidemiology of methicillin resistant Staphylococcus aureus (MRSA) is characterized by the emergence of infections caused by non multiresistant MRSA carrying staphylococcal chromosomal cassette (SCC)mec IV or V in the healthcare settings. A molecular epidemiological analysis of non multiresistant MRSA isolates from four acute general hospitals was performed in Palermo, Italy, during a one year period.

Methods: For the purpose of the study, MRSA isolates were defined as non multiresistant when they were susceptible to at least three classes of non β-lactam antibiotics. Seventy-five isolates were submitted to antimicrobial susceptibility testing, multilocus sequence typing (MLST) and polymerase chain reaction (PCR) for SCCmec, accessory gene regulator (agr) groups, arginine catabolic mobile element (ACME) and Panton Valentine leukocidin (PVL) toxin genes. For epidemiological typing, Multiple-Locus Variable-Number Tandem Repeat Fingerprinting (MLVF) was performed on all isolates and pulsed field gel electrophoresis (PFGE) on ST8 isolates.

Results: Non multiresistant MRSA isolates were isolated from all hospitals. Resistances to ciprofloxacin, macrolides and tetracycline were the most prevalent. MLST attributed 46 isolates with ST22, 13 with ST8, eight with ST1, three with ST50 and three with ST398. SCCmec type IV was found in all isolates. PVL was detected in one ST22 isolate. All isolates tested negative for the ACME element. MLVF identified 31 different patterns, some subtype clusters ranging in size between two and 22 isolates. The closely related PFGE patterns of the ST8 isolates differed from USA300.

Conclusions: A polyclonal circulation of non multiresistant MRSA along with blurring of boundaries between healthcare associated (HA)-MRSA and community associated (CA)-MRSA appear to be occurring in our epidemiological setting. A better understanding of spread of MRSA with the support of molecular typing can provide invaluable information in the epidemiological, microbiological and clinical fields.

Show MeSH
Related in: MedlinePlus