Two strains fo S.S.P.E. virus show both haemagglutinin and salt-dependent haemagglutinin. These properties are associated with distinct plaque forms within each strain. The existence of salt-dependent strains in wild-type measles virus suggests that they should be found in the early isolates of all strains of S.S.P.E.
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Gould et al. (1976) studied this question.
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