Patients and specimens in the study.

Note: OF, Oral fluid; CSF, cerebrospinal fluid; TS, throat swab; TCF, tissue culture fluid; P, parotitis; N, neurological complications; NK: not known; MMR, measles-mumps-rubella vaccine; UK, United Kingdom.*Dominican Republic linked re-infection case in Sweden, childhood infected (Dr. Kari Johansen, Swedish Institute for Infectious Disease Control).