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risk factors for seropositivity to h5 avian influenza virus in ostrich farms in the western cape province, south africa.in a 2005 serological survey, carried out in response to an outbreak of h5n2 avian influenza (ai) in ostriches in the eastern cape province, 16.3% of ostrich farms in the western cape province of south africa were found to be seropositive to h5 ai virus. we subsequently carried out a questionnaire-based census survey on all available registered western cape ostrich farms that still existed at the end of 2005 (367 farms, of which 82 were seropositive), in order to identify risk factors associated ...200818486977
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