3.
A serotype or serovar is a distinct variation within a species of bacteria or virus or
among immune cells of different individuals. These microorganisms, viruses, or cells are
classified together based on their surface antigens, allowing the epidemiologic classification of
organisms to the subspecies level
21.
The current mumps strain (Jeryl-Lynn) has the lowest associated
incidence of post vaccine aseptic meningitis (from 1 in 150,000 to 1 in
1.8 million).