A case-control questionnaire survey of risk factors for porcine reproductive and respiratory syndrome (PRRS) seropositivity in Danish swine herds

Author: Mousing J.   Permin A.   Mortensen S.   Botner A.   Willeberg P.  

Publisher: Elsevier

ISSN: 0378-1135

Source: Veterinary Microbiology, Vol.55, Iss.1, 1997-04, pp. : 323-328

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