Study of a New Strain of Paramyxoviruses Isolated from Wild Ducks: Antigenic and Biological Properties

Abstract

Among the different strains of avian paramyxoviruses isolated from migrating feral ducks, 2 were identified as Newcastle disease viruses (NDV) and the 5 others would correspond to a new serotype for which the name of Duck/Mississippi/75 virus is suggested. The characteristics of this new serotype are as follows: Duck/Mississippi/75 virus is able to grow as well in allantoic as in amniotic cavities of embryonated hen''s eggs; the hemagglutinin and hemolytic activities can be detected with hen red blood cells; the neuraminidase hydrolyses the .alpha.2 .fwdarw. 3 bonds of the fetuin substrate and its pH activity could be species specific. Antigenically, this serotype is different from all human and animal paramyxoviruses, in spite of an antigenic relationship with NDV.