The occurrence of Staphylococcus aureus isolates, especially MRSA and MSSA
isolates contaminated in raw milk, can cause endemic chronic bovine mastitis in the area of
dairy farming, Maha Sarakham province of Thailand. A total of 165 milk samples were
collected and S. aureus isolation was conducted by using a conventional method and PCR
reaction of 994 bp of coagulase gene fragment. The results revealed 25 isolates of S. aureus that
showed a positive result of coagulase gene. All 25 isolates were tested for MRSA and MSSA
identification by mecA gene that demonstrated 2 mecA-positive MRSA isolates (n=2) and 23
mecA-negative MSSA isolates (n=23). Two isolates of MRSA indicated that the antibiotic
resistance was a continuing problem in this area. All isolates have also been found to be isolates
having enterotoxin producing genes including sea, seb, sec, and sed but not found any
enterotoxin genes in MRSA and MSSA. To investigate factors related to MRSA, a survey
research was conducted and showed that all farms used both of injecting drug and
intramammary infusion antibiotics for their bovine mastitis treatment. The case-control study
was divided into farms using oxytetracycline and penicillin as the first choice. The study found
that oxytetracycline has been used routinely to treat mastitis in 2 and 18 farms having MRSA
and MSSA, respectively. The odds of MRSA among farms using oxytetracycline was more
than the odds of MSSA among farms using oxytetracycline. This study found that the often use
of oxytetracycline in this area might create new properties of bacteria to become resistant to
antibiotics. However, it may have other factors affecting bacterial resistances that need to study
in further research to more understanding and to introduce the result of risk factors
investigation to farmers.
Keywords
Staphylococcus aureus, MRSA, MSSA
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
Published by : Association of Agricultural Technology in Southeast Asia (AATSEA) Contributions welcome at : http://www.ijat-aatsea.com
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