Influenza Detected in Ohio Swine Herds


The Ohio Animal Disease Diagnostic Laboratory (OADDL) recently reported on routine isolation of H1N1, H3N2 and H1N2 serotypes of influenza virus from hogs.  In some cases, multiple serotypes were detected from a single farm submission.


The OADDL uses rapid polymerase chain reaction assay to screen for influenza A virus followed by subtyping to identify hemagglutinin and neuraminidase genes.


H1 influenza A occurs frequently in states with large concentrations of commercial hogs, suggesting the need for epidemiologic separation of commercial or subsistence units from poultry flocks including turkeys, layers and broilers.  In some states with high population of hogs, vaccination of turkeys with an inactivated H1virus is carried out as a routine, based on the high probability of exposure.


It is inappropriate to operate hogs and commercial chickens on the same farm.  Special biosecurity precautions should be implemented by feed mills that deliver to a multi-species clientele.