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Research Article
ScienceAsia 32 (2006): 127-132 |doi: 10.2306/scienceasia1513-1874.2006.32.127
Epidemiologic Study of methicillin-resistant
Staphylococcus aureus by
Coagulase Gene Polymorphism
Isaya Janwithayanuchit,* Somying Ngam-ululert, Porntip Paungmoung and
Watcharin Rangsipanuratn
ABSTRACT: An epidemiologic study of methicillin-resistant Staphylococcus aureus (MRSA) was conducted by
antibiotype, coagulase gene typing and polymerase chain reaction-restriction fragment length polymorphism
(PCR-RFLP) analysis. A total of 129 MRSA strains were isolated from 17 hospitals in the regions of the
central, northern, northeastern and eastern Thailand during November 2003 – March 2004. Antimicrobial
susceptibility testing with a panel of 10 antimicrobial agents showed 9 different antibiotypes. The antibiotypes
1 and 2 were the most common phenotypes with 44.2% and 35.6% of the isolates, respectively. Coagulase
gene typing of MRSA strains generated 4 different genotypes: I, II, III, IV, the PCR products of which were
492 20, 654 20, 735 20 and 816 20 bp with the percentages of 1.5 (2/129), 2.3 (3/129), 82.2 (106/129)
and 14 (18/129), respectively. Coagulase gene PCR-RFLPs exhibited 4 patterns: A, B, C and D, with AluI
digested PCR product fragments at 220 20 and 220 20 bp (pattern A); 400 20 and 220 20 bp (pattern B);
420 20 and 220 20 bp (pattern C); and 510 20 and 220 20 bp (pattern D). The percentage values for each
pattern were compatible with those from the coagulase gene typing method. The results indicated that
antibiotypes 1, 2, coagulase gene type III and PCR-RFLP pattern C were the epidemic strains while the rest
were sporadic strains.
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Faculty of Medical Technology, Huachiew Chalermprakiet University, Samutprakarn 10540, Thailand.
* Corresponding author, E-mail: isaya@hcu.ac.th
Received 16 Mar 2005,
Accepted 16 Nov 2005
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