[the prevalence of antibodies to influenza virus and respiratory coronavirus in fattening pigs in spain].the presence of antibodies to two influenza viruses of the type a (h1n1 and h3n2) and to a porcine respiratory coronavirus was investigated in a study lasting a year. 735 blood serum samples were collected from 79 closed pig fattening farms in the province segovia (spain). hemagglutination inhibition was used with influenza viruses. the percentage of positive results was 78.5% and 62.5% respectively for the serotypes h1n1 and h3n2. a clear reduction in the spread of antibodies was observed in th ...19892554624
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