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- RNA enveloped (single strand, negative sense) virus w/ 5 antigenically distinct types: human parainfluenza virus types HPIV, HPIV-1, HPIV-2, HPIV-3, HPIV-4A/4B.
- Viruses are members of the paramyxovirus family with two different genera:
- HPIV-1, HPIV-3 belong to the Respirovirus genus.
- HPIV-2, HPIV-4 belong to the Rubulavirus genus.