<unk>  (HPIVs) are a group of four distinct serotypes of single-stranded RNA<unk>  belonging to the paramyxovirus family. They are the second most common cause of lower respiratory tract infection in younger children.
Human parainfluenza viruses
Human respiratory syncytial virus
Enterovirus
Coxsackie A virus
Arbovirus
Bovine coronavirus
Cytomegalovirus
Coxsackie virus