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Antigenic and Structural Relationships Between Avian Paramyxoviruses Isolated from Ducks in Hong Kong and Mississippi, U.S.A.

M. Aymard

N. Kessler

^* Poultry Department Central Veterinary Laboratory, New Haw, Weybridge Surrey KT15 3NB
Laboratoire de Virologie WHO Collaborating Centre for Viral Reference and Research Faculte de Medecine, 8 avenue Rockefeller 69373 Lyon, Cedex 2, France

Representative isolates of the paramyxoviruses duck/Hong Kong/75 and duck/Mississippi/75 were shown to be serologically closely related by haemagglutination and neuraminidase inhibition tests. The structural polypeptides of these viruses were also shown to be similar. For each of the isolates tested, polyacrylamide gel electrophoresis in the presence of SDS revealed a similar polypeptide pattern consisting, under reducing conditions, of seven polypeptides with apparent mol. wt. ranging from 46000 to 190000. Each virus had two glycosylated polypeptides with apparent mol. wt. of 56000 and 71000 to 72000 under reducing conditions and 62000 to 63000 and 135000 to 142000 under non-reducing conditions.

Received 9 March 1979; accepted 2 May 1979.