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Antibody Titres In Broilers Of Infectious Bronchitis Virus Strains 4/91 And Massachusetts In Thailand, Thawat Lekdumrongsak, Jiroj Sasipreeyajan, Prachak Poomvises, Achara Tawatsin

The Thai Journal of Veterinary Medicine

Thirty, one-day-old broilers were divided into 3 groups, 10 birds each. Group 1 was vaccinated twice with a live infectious bronchitis virus vaccine, (IBV)-serotype Massachusetts, strain H120 when one day old and a live IBV-strain Massachusetts vaccine when ten days old. Group 2 was vaccinated once with a live IBV-strain Massachusetts vaccine when ten days old. Group 3 were non-vaccinated controls. Blood samples were taken from birds on days 1, 10, 21, 28, 35 and 42. Samples were tested by a virus neutralization(VN) test, for strains 4/91 and Massachusetts(M41) neutralizing antibodies and were tested by an enzyme-linked immunosorbent assay(ELISA) for …