any organism of microscopic size

an agent capable of producing infection

relating to or caused by a virus

the branch of medical science that studies viruses and viral diseases

relating to or caused by a virus

a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis

a virus that is parasitic (reproduces itself) in bacteria

a plant pathogen that is a virus consisting of a single strand of RNA

an animal pathogen that is a virus

a virus that remains dormant in the body for a long time before symptoms appear

(virology) a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses)

the branch of medical science that studies viruses and viral diseases

a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint

a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease