[Induction of biological protection in pigs against infection with Aujeszky disease virus by vaccination with large doses of live or inactivated vaccines].
Pigs were inoculated against the Aujeszky's disease twice in a four-week interval. The dose of the live vaccine was 10(6) TKID50 and the titres of neutralizing antibodies were 1 : 16 to 1 : 128 in blood serum. Two weeks later the pigs were exposed to contact infection. Primary multiplication of the virus was observed on the mucous membranes of the nose and oropharynx and the virus was detected on the nasal mucous membrane within one to five days, the maximum infection titre values being 10(1.3) TKID50, and on the oropharyngeal mucous membrane within seven days, the maximum titres being up to 10(3.5) TKID50. In another group the pigs were inoculated with the same dose of attenuated virus or re-vaccinated with a dose of 10(8.5) TKID50, with neutralizing antibody titres of 1 : 256 to 1 : 1024 in blood serum. No viruses were detected on the nasal mucous membrane after contact infection and only trace amounts of the virus were found in the oropharynx within one to five days. Six piglets were inoculated in the same way but the infection was intranasal. The infective virus was detected on the nasal mucous membrane of only one piglet; however, trace amounts of the virus were found in the oropharynx of all the six piglets within three to nine days after infection. The nasal mucous membrane and oropharynx of the noninoculated control piglets exposed to intranasal infection were infectious until death and those of the contact-infected piglets remained so until the 14th day. At the intranasal infection of the piglets infected twice with a live or inactivated vaccine and slaughtered the 1st to 14th day after intranasal infection, the virus was replicated only in the place of primary multiplication without penetrating into the CNS and the internal organs. The intranasal infection of susceptible control piglets resulted in the dissemination of the infection via the neurogenic and lymphohaematogenic routes.
D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D011558:Herpesvirus 1, Suid / Q000276:immunology*; D011557:Pseudorabies / Q000517:prevention & control*; D013552:Swine; D013553:Swine Diseases / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary; D014613:Vaccines, Attenuated / Q000008:administration & dosage; D014765:Viral Vaccines / Q000008:administration & dosage*
D000914:Antibodies, Viral; D014613:Vaccines, Attenuated; D014765:Viral Vaccines
Vyvolańie biologickej chránenosti osípaných proti infekcii vírusom Aujeszkého choroby ockovaním vel'kými dávkami zivej alebo inaktivovanej vakcíny.