Carriage of Methicillin-resistant Staphylococcus aureus in a Colony of Rhesus (Macaca mulatta ) and Cynomolgus (Macaca fascicularis ) Macaques

Comparative Medicine
Abigail W GreensteinJeffrey D Fortman

Abstract

Methicillin-resistant Staphylococcus aureus (MRSA) carriage and infection are well documented in the human and veterinary literature; however only limited information is available regarding MRSA carriage and infection in laboratory NHP populations. The objective of this study was to characterize MRSA carriage in a representative research colony of rhesus and cynomolgus macaques through a cross-sectional analysis of 300 animals. MRSA carriage was determined by using nasal culture. Demographic characteristics of carriers and noncarriers were compared to determine factors linked to increased risk of carriage, and MRSA isolates were analyzed to determine antimicrobial susceptibility patterns, staphylococcal chromosome cassette mec (SCCmec) type, and multilocus sequence type (ST). Culture results demonstrated MRSA carriage in 6.3% of the study population. Animals with greater numbers of veterinary or experimental interventions including antibiotic administration, steroid administration, dental procedures, and surgery were more likely to carry MRSA. Susceptibility results indicated that MRSA isolates were resistant to β-lactams, and all isolates were resistant to between 1 and 4 non β-lactam antibiotics. In addition, 73.7% of MRSA is...Continue Reading

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