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Kulíková L., V. Jurajda, R. Juranová: Effects of Infectious Bursal Disease Vaccination Strains on the Immune System of Leghorn Chickens. Acta Vet. Brno 2004, 73: 205-209. The detection of infectious bursal disease on chicken farms in the Czech Republic and problems related with it triggered the interest in the immunoprophylaxis of the disease in this country. In the present study, levels of post-vaccination antibodies against infectious bursal disease were monitored by the ELISA test in seven experiments with Leghorn chickens free of maternal antibodies. The chickens were vaccinated with commercial vaccines made of viruses of different virulence (A, B, C - mild; D - intermediate; E, F, G - highly virulent). Effects of vaccination strains on the chickens' immune system were assessed using the bursa of Fabricius index, and a statistical comparison with results from a control group was made. Of the mild vaccines, only vaccine A produced a sufficiently high antibody titre and 100% positivity in the group. Vaccine C, on the other hand, caused a statistically significant (p < 0.05) atrophy of the bursa of Fabricius. The intermediate vaccine D produced only 80% positivity, with the lowest average post-vaccination antibodies titres and statistically insignificant BF index. The most virulent vaccines E and F demonstrated an almost 100% positivity, high post-vaccination antibodies titres and, as expected, statistically significant (p < 0.01) bursal atrophy. Vaccine G from among the virulent vaccines also produced 100% positivity, but, surprisingly, caused no damage to the bursa of Fabricius. The results of the study point to differences in virulence and immunogenic properties of different vaccination strains within individual groups of vaccines that need to be borne in mind in everyday veterinary practice.

Effects of Infectious Bursal Disease Vaccination Strains on the Immune System in Leghorn Chickens