What is a laboratory confirmed case of mumps?
Acute mumps infection can be confirmed by the presence of serum mumps immunoglobulin M (IgM), a four-fold rise in serum mumps immunoglobulin G (IgG) titer between acute and convalescent phase serum specimens, positive mumps virus culture, or detection of viral RNA by reverse transcription-polymerase chain reaction (RT- PCR).