Article

Prevalence, antibiotic resistance and molecular characterisation of Staphylococcus aureus in pigs at agricultural fairs in the USA.

Center for Emerging Infectious Diseases, University of Iowa College of Public Health, 105 River Street S431, Iowa City, IA 52242, USA.
The Veterinary record 04/2012; 170(19):495. DOI:10.1136/vr.100570
Source: PubMed

ABSTRACT Fairs and petting zoos have been associated with outbreaks of zoonotic disease. Previously, the presence of meticillin-resistant Staphylococcus aureus (MRSA) was documented in commercial pigs; therefore, it was hypothesised that antibiotic-resistant S aureus may also occur in pigs exhibited at agricultural fairs. To test this hypothesis, 157 pigs were swabbed at two state fairs in 2008 to 2009. Both nares were sampled and cultures were grown in enrichment broth, then plated onto selective MRSA plates and blood plates. S aureus was confirmed using phenotypic and molecular methods, and was analysed using spa typing, gene-specific polymerase chain reaction and antibiotic susceptibility testing. The presence of S aureus was confirmed in samples collected from pigs exhibited at USA pig shows. Twenty-five of 157 (15.9 per cent) samples were positive for S aureus. Two isolates (8 per cent) were resistant to meticillin; 23/25 (92 per cent), 14/25 (56 per cent) and 15/25 (60 per cent) were resistant to tetracycline, erythromycin and clindamycin, respectively. spa typing revealed multiple isolates of spa type t034 (9/25, 36 per cent) and t337 (7/25, 28 per cent) and singletons of t002, t209, t526, t1236, t1334, t1683, t3075, t5784 and t5883. These results verify the presence of antibiotic-resistant S aureus in pigs exhibited at USA fairs, suggesting that pigs are a potential reservoir for S aureus within this environment.

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    PLoS ONE 01/2013; 8(1):e53738. · 4.09 Impact Factor
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Keywords

agricultural fairs
 
antibiotic susceptibility testing
 
antibiotic-resistant S aureus
 
blood plates
 
commercial pigs
 
enrichment broth
 
gene-specific polymerase chain reaction
 
meticillin-resistant Staphylococcus aureus
 
molecular methods
 
petting zoos
 
pigs
 
pigs exhibited
 
potential reservoir
 
S aureus
 
selective MRSA plates
 
spa typing
 
state fairs
 
USA fairs
 
USA pig
 
zoonotic disease