1887

Abstract

In an earlier report, we described the construction of the genetically engineered pseudorabies virus strain 2.4N3A which does not express glycoprotein gl. Although this strain showed a strongly reduced virulence in 10-week-old seronegative pigs, it could still cause severe disease or death in 3-day-old piglets. To attenuate the strain further, we constructed mutants with a deletion in the viral thymidine kinase gene. One mutant strain, designated 783, has a deletion of 19 base pairs and was shown to be highly immunogenic and safe for vaccination of pigs against pseudorabies virus.

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1990-07-01
2024-11-05
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