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Sequential serological studies in different turkey farms in northern germany 2. report detection of humoral antibodies against infectious bursal disease virus serotype i and ii



Sequential serological studies in different turkey farms in northern germany 2. report detection of humoral antibodies against infectious bursal disease virus serotype i and ii



Archiv fuer Gefluegelkunde 55(1): 14-18



By means of virus neutralization assays, a serological survey was performed in order to acquire knowledge on the occurrence of IBDV-serotype I and II during 5 fattening periods of 4 different turkey farms. These farms were clients for the Clinic for Poultry of the Veterinary School of Hannover. Blood samples were taken at day of hatch, and thereafter in the 4th, 8th and 16th week of age in the flocks H-1, B-1, M-1, P-1 and H-2 and in the 22nd week of age in the flocks H-1, B-1, P-1 and H-2. Furthermore, reference antisera against these serotypes were prepared in chicken and tested for cross-neutralization of the heterologous serotypes. Little or no cross reactions were observed as results of these test. In the course of the fattening periods, different patterns of the occurrence of IBDV-antibodies were observed. In virus neturalization assays, the majority of the sera obtained at hatching in the flocks H-1 (80% seropositive) and P-1 (65% seropositive) exhibited antibodies against IBDV-serotype I, whereas the majority of sera obtained in flock P-1 (75% seropositive) and H-2 (100% seropositive) had antibodies against serotype II. After the 6th week, the percentage of reagents positive for IBDV-serotype II increased. In the 8th week of life, 65% of the sera from flock H-1 were found positive, followed by an increase in the 16th week of age to 70% (Flock H-1) and 85% (Flock P-1) and in the 22nd week of age to each 100%. These observations suggest a field infection by IBDV-serotype II in the corresponding turkey farms. With some exceptions, neutralizing antibodies against IBDV-serotype I were found only when the sera came from day-old offsprings from parent flocks, where vaccination with IBDV-serotype I had been performed. These results suggest that infections with IBDV-serotype II were existing at least within the turkey farms examined. No clinical symptoms or depression of performance parameters were observed in these farms. In view of the inconsistent literature reports on the pathogenicity of this serotype, however, further epizootiological and etiological studies are required in order to obtain further knowledge on the occurrence and significance of the IBDV-serotype II in turkeys.

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