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By J B McFerran; M S McNulty; Commission of the European Communities. Coordination of Agricultural Research

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Additional resources for Acute virus infections of poultry : a seminar in the CEC Agricultural Research Programme, held in Brussels, June 13-14, 1985

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Also indicates 51 a more serious infection. v. The lack of a rise in HI titres after challenge at both 3 weeks and 11 weeks after vaccination with 500 and 125 pI of vaccine B indicates a good protection at both ages. In these groups also a smaller proportion of the birds reacted with formation of precipitating antibody compared with the same groups vaccinated with A. 5 pI formed precipitating antibody, indicating a more intensive contact with the challenge virus than in the other two groups. Both in the vaccinated and in the non-vaccinated birds, virus was reisolated from faeces samples 3 days after challenge.

None of these strains produced plaques in chicken embryo fibroblasts in the absence of trypsin. 5* * data from Franciosi et al. (1981). 21 32 Most of the isolates were tested for their resistance to pH 4. (Table 2). 8 log. 6 log. 2 log, and the two new H6 TABLE 2 Sensitivity to pH 4 (10 minutes at 40 C)* Avian strains isolated in Italy (1965-83) turkey/Italy/1976-82 11 strains H6N2 chicken/Italy/80 HSN2 turkey/Italy/80 HSN2 turkey/Italy/80 H6N6 turkey/Italy/83 H6Nl guinea fowl/Italy/79 H6N2 H6N2 turkey/Italy/76 quail/Italy/67 HlON8 turkey/Italy/80 H6N2 turkey/Italy/77 HlON2 turkey/Italy/82 H7N2 2 strains HlON8 duck/Italy/6S HlON8 quail/Italy/7O HlON8 quail/Italy/79 More recent isolates turkey/Italy/83 H9N?

V. also indicates 51 a more serious infection. v. The lack of a rise in HI titres after challenge at both 3 weeks and 11 weeks after vaccination with 500 and 125 pI of vaccine B indicates a good protection at both ages. In these groups also a smaller proportion of the birds reacted with formation of precipitating antibody compared with the same groups vaccinated with A. 5 pI formed precipitating antibody, indicating a more intensive contact with the challenge virus than in the other two groups.

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