[Immune response of the chicks from immune layers vaccinated at 1 and 4 days of age against Newcastle disease].
The study of antihemagglutinins in day-old chicks revealed the presence of congenital antibodies against the Newcastle disease virus, having an average geometric titer of lg2 7.9. In the vaccinated 1,500 chicks on the first and fourth day with a La Sota vaccine there was four days later a drop in the antibody titer. Then again a rise in the antibody titer was noted that reached on the 14th day an average geometric value of lg2 7.6 which remained unchanged up to the 40th day. The antihemagglutination titers in the untreated chicks on the 40th day of age dropped to lg2 1.8. As many as 70 per cent of the control chicks died at challenging on the 24th day of age, while all of the treated birds (100 per cent) were given protection through vaccination by the spray method or ocularly and nasally, withstanding challenge on the 20th and 24th day following treatment.
D000367:Age Factors; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000032:analysis; D000914:Antibodies, Viral / Q000032:analysis; D000917:Antibody Formation; D002645:Chickens / Q000276:immunology*; D007110:Immunity, Active; D009521:Newcastle Disease / Q000276:immunology*; D014611:Vaccination / Q000662:veterinary*; D014765:Viral Vaccines / Q000008:administration & dosage
D000888:Antibodies, Anti-Idiotypic; D000914:Antibodies, Viral; D014765:Viral Vaccines
Imunen otgovor pri pileta, proizkhozhdashti ot imunni nosachki, vaksinirani na ednodnevna i chetirdnevna vuzrast sreshtu psevdochuma