<prompt> Answer this question truthfullyWhat are mumps?  <response>: <reason> Mumps virus MuV is an enveloped, non-segmented, negative-sense RNA virus that causes mumps. MuV belongs to the genus Rubulavirus and family Paramyxovirus.The spherical virion is approximately 200nm is diameter and its genome consists of a single RNA strand of 15,384 nucleotides. The RNA is encapsidated by nucleoprotein N protein forming the ribonucleoprotein RNP complex.MuV binds to host cell sialic acid via haemagglutinin-neuraminidase HN and fusion F glycoproteins and cause virus-to-cell membrane fusion. Replication and transcription is mediated by an RNA polymerase complex composed of large L and phospho- P proteins. Budding is initiated after HN and F glycoproteins are transported through the endoplasmic reticulum and Golgi body to the cell surface. Matrix M protein localizes the RNP to the area of the host cell expressing HN and F. 