Differences in virulence genes and genome patterns of mastitis-associated Staphylococcus aureus among goat, cow, and human isolates in Taiwan.

Abstract

A total of 117 mastitis-associated Staphylococcus aureus isolates from cow, goat, and human patients were analyzed for differences in antibiotic susceptibility, virulence genes, and genotypes using accessory gene regulator (agr) typing, pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). Multidrug-resistant (MDR) S. aureus were commonly found in all sources, though they were predominantly found in human and goat isolates. Almost 70% of the isolates were resistant to ampicillin and penicillin. Host-associated virulence genes were identified as follows: tst, a gene encoding toxic shock syndrome toxin, was found in goat isolates; lukED and lukM, genes encoding leukocidin, found in cow isolates; lukPV, a gene encoding leukocidin, found in human isolates; and eta, a gene encoding for exfoliative toxin, found in both human and cow isolates. All four types of hemolysin, α, β, γ, and δ, were identified in human isolates, three types (α, γ, and δ), were identified in cow isolates, and two types (α and δ) were identified in goat isolates. Agr-typing determined agr1 to be the main subtype in human and cow isolates. PFGE and MLST analysis revealed the presence of diverse genotypes among the three sources. In conclusion, mastitis-associated, genetically diverse strains of MDR S. aureus differed in virulence genes among human, cow, and goat isolates.

• Authors: Chishih Chu, Yajiun Wei, Shih-Te Chuang, Changyou Yu, Chih-Hsuan Changchien, Yaochi Su
• Journal: Foodborne pathogens and disease (Foodborne Pathog Dis) Vol. 10 Issue 3 Pg. 256-62 (Mar 2013) ISSN: 1556-7125 [Electronic] United States
• PMID: 23489048 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Agr protein, Staphylococcus aureus
• Bacterial Proteins
• DNA, Bacterial
• LukM protein, Staphylococcus aureus
• Penicillins
• Trans-Activators
• Virulence Factors
• Ampicillin

Topics

• Ampicillin (pharmacology)
• Animals
• Bacterial Proteins (genetics, metabolism)
• Cattle
• DNA, Bacterial (isolation & purification)
• Drug Resistance, Multiple, Bacterial
• Electrophoresis, Gel, Pulsed-Field
• Goats
• Humans
• Mastitis (microbiology, veterinary)
• Microbial Sensitivity Tests
• Multilocus Sequence Typing
• Penicillins (pharmacology)
• Staphylococcus aureus (drug effects, genetics, isolation & purification, pathogenicity)
• Taiwan
• Trans-Activators (genetics, metabolism)
• Virulence
• Virulence Factors (genetics)