Isolation of parainfluenza virus type 3 from an infant with meningoencephalitis.

A parainfluenza virus type 3 strain was isolated from the cerebrospinal fluid of an infant with a clinical diagnosis of meningoencephalitis. Specific HAI antibodies to parainfluenza virus type 3, ranging in titer from 1/80 to 1/160 could be detected in the infant's serum. A 2-fold rise in the level of complement fixing serum antibodies-from 1/16 at the first to 1/32 at the second collection-was recorded.