Vesicular stomatitis virus. Coloured transmission electron micrograph (TEM) of vesicular stomatitis virus (VSV) particles (blue) budding from a host cell (purple). Viruses replicate using the host cell's genetic machinery. These virus particles have formed in a cultured cell. VSV is a disease that infects sheep, horses and goats, and is similar to foot and mouth disease. VSV is a virus in the family Rhabdoviridae. Magnification: x10, 000 when printed at 10 centimetres wide.