A genus of the family paramyxoviridae (subfamily paramyxovirinae) where all the virions have both haemagglutinin and neuraminidase activities and encode a c protein. Parainfluenza virus 1, human is the type species.
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I think that you have to realize that the Mumps causing virus is only one of the paramyxovirus (or more correctly: belonging to the paramyxoviridae family of virus). The virus causing Mumps is specific to human, but in the paramyxovirus family, other member infect ...
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