The Viruses
   The RNA Viruses
     The Negative Stranded ssRNA Viruses
       Order Mononegavirales
         Family Paramyxoviridae
           Subfamily Pneumovirinae see Family Pneumoviridae
             Genus Pneumovirus
               1 Bovine respiratory syncytial virus see Bovine orthopneumovirus
               2 Human respiratory syncytial virusᵀ
               3 Murine pneumonia virus