4.5 Article

Comparison of air samples, nasal swabs, ear-skin swabs and environmental dust samples for detection of methicillin-resistant Staphylococcus aureus (MRSA) in pig herds

Journal

EPIDEMIOLOGY AND INFECTION
Volume 142, Issue 8, Pages 1727-1736

Publisher

CAMBRIDGE UNIV PRESS
DOI: 10.1017/S095026881300280X

Keywords

Air sampling; diagnostic; methodology; mecA; spa; swine

Funding

  1. Danish Ministry of Food, Agriculture and Fisheries [3304-NIFA-11-0561, 3304-FVFP-09-F-002-1]
  2. Danish Veterinary and Food Administration 'centrally coordinated projects'

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To identify a cost-effective and practical method for detection of methicillin-resistant Staphylococcus aureus (MRSA) in pig herds, the relative sensitivity of four sample types: nasal swabs, ear-skin (skin behind the ears) swabs, environmental dust swabs and air was compared. Moreover, dependency of sensitivity on within-herd prevalence was estimated. spa-typing was applied in order to study strain diversity. The sensitivity of one air sample was equal to the sensitivity of ten pools of five nasal swabs and relatively independent of within-herd prevalence [ predicted to be nearly perfect (99%) for within-herd prevalence >= 25%]. The results indicate that taking swabs of skin behind the ears (ten pools of five) was even more sensitive than taking nasal swabs (ten pools of five) at the herd level and detected significantly more positive samples. spa types t011, t034 and t4208 were observed. In conclusion, MRSA detection by air sampling is easy to perform, reduces costs and analytical time compared to existing methods, and is recommended for initial testing of herds. Ear-skin swab sampling may be more sensitive for MRSA detection than air sampling or nasal swab sampling.

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