Metapneumovirus

**Semantic type:** Virus

**Definition:** A genus of nonsegmented, negative-strand ssRNA viruses in the Pneumovirinae subfamily that uniquely accomplishes cell fusion without the help of an attachment protein. This virus has a genome of about 13 kb, encoding eight proteins. The virion is enveloped and spherical with a diameter of about 150 nm

**Synonyms:** - METAPNEUMOVIRUS