Mouse Anti-RSV (fusion protein) monoclonal antibody. RSV is the most common germ that causes lung and airway infections in infants and young children. RSV is a medium-sized (120-200 nm) enveloped virus that contains a lipoprotein coat and a linear negative-sense RNA genome. The former contains virally encoded F, G, and SH lipoproteins. The F and G lipoproteins are the only two that target the cell membrane, and are highly conserved among RSV isolates.