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Increase of virulence of swine fever virus in pigs treated with serum. Contribution to the problem of immunological variants



Increase of virulence of swine fever virus in pigs treated with serum. Contribution to the problem of immunological variants



Zentbl. VetMed, 14B: 238-258



Strains of swine fever virus were isolated from various phases of the disease, before and after its clinical peak. In the latter, neutralizing antibodies were found in the serum in addition to the virus itself. When normal pigs and pigs treated with 5 ml of hyperimmune serum were infected with the various virus samples, the relatively virulent virus isolated from pigs which had passed the clinical peak was neutralized.

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