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New tests for characterization of mumps virus antibodies: hemolysis inhibition, single radial immunodiffusion with immobilized virions, and mixed hemadsorption.

ABSTRACT

Hemolysis inhibition (HLI), single radial immunodiffusion (SRID) with immobilized virions, and mixed hemadsorption tests were used for measuring antibodies against mumps virus. Rabbit hyperimmune sera against mumps and early and late human convalescent sera were analyzed. All three tests identified antibodies against both hemagglutinin and the second major envelope component, hemolysin (fusion factor). The sensitivity of the HLI test corresponded to that of the hemagglutination inhibition (HI) test, but in some sera HLI antibodies occurred in greater quantity than HI antibodies. The SRID test readily identified rises in antibody titers in connection with acute infection. Due to its simplicity and lack of sensitivity to nonspecific inhibitors, it is recommended for use in this context. The mixed hemadsorption test showed a high sensitivity for specific identification of mumps antibodies. It therefore may be suitable for use in screening for immunity to mumps.