Enveloped, ⊝ ssRNA, non-segmented

Parainfluenza – croup (seal-like barking cough)Mumps, MeaslesRSV – bronchiolitis in babies

- All contain surface F (fusion) protein, which causes respiratory epithelial cells to fuse and form multinucleated cells.

- Palivizumab (monoclonal antibody against F protein) prevents pneumonia caused by RSV infection in premature infants.