RESUMO
In spite of the eradication of Aujeszky's disease in Denmark a single outbreak was recorded in December 1988 and another severe epizootic took place during the winter and spring of 1989/90. The epizootic occurred in nearly the same areas as the preceding epizootic during the winter of 1987/88. Identification of the strains of virus involved eliminated the possibility that the latest epizootic was due to the persistence of virus in the pig population. Furthermore, as during the preceding epizootic, initial recordings of the new strains were found to coincide with periods with southerly winds. It was concluded from circumstantial evidence that the concurrent introductions of virus to several farms played a major role during the epizootic.
Assuntos
Microbiologia do Ar , Surtos de Doenças/veterinária , Herpesvirus Suídeo 1/classificação , Pseudorraiva/transmissão , Doenças dos Suínos/transmissão , Movimentos do Ar , Animais , DNA Viral/análise , Dinamarca/epidemiologia , Herpesvirus Suídeo 1/genética , Polimorfismo de Fragmento de Restrição , Pseudorraiva/epidemiologia , Estações do Ano , Suínos , Doenças dos Suínos/epidemiologiaRESUMO
Field isolates of suid herpesvirus 1 (Aujeszky's disease virus) from Poland and Hungary were identified by restriction fragment pattern analysis as derivatives of attenuated vaccine strains. The Polish isolates were found to be related to the BUK-TK-900 strain (Suivac A) which is widely used as a live vaccine in Poland, and the Hungarian isolates were related to the Bartha K-61 vaccine strain widely used in Hungary. Pigs experimentally infected with derivatives of BUK-TK-900 or BUK-TK-900 itself were found to develop gI-antibodies, while pigs infected with derivatives of Bartha K-61 showed a gI-negative response.