Wikipedia
Pneumoviridae
Pneumoviridae is a new virus family in the order Mononegavirales. It was created in 2016 by elevating the now dissolved paramyxoviral subfamily Pneumovirinae. Pneumoviruses produce enveloped virions (virus particles) that vary in size from 150 to 200 nm in diameter. The nucleocapsid consisting of a protein shell and viral nucleic acids has a helical symmetry.