(virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein

any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye

animal viruses belonging to the family Arenaviridae

an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon

animal viruses belonging to the family Filoviridae

an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses