viruses Definition

any of a large group of submicroscopic infectious agents that are usually regarded as nonliving extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic material but no semipermeable membrane, that are capable of growth and multiplication only in living cells, and that cause various important diseases in humans, animals, and plants; also : filterable virus

a disease or illness caused by a virus

the causative agent of an infectious disease

hiv

any of numerous serotypes of three enteroviruses (species Human enterovirus A, Human enterovirus B, and Human enterovirus C) that are associated with mild to serious illness (such as sore throat, diarrhea, hand, foot and mouth disease, conjunctivitis, meningitis, and hepatitis)

a virus whose genome consists of DNA

any of several filoviruses (genus Ebolavirus and especially species Zaire ebolavirus) of African origin that cause an often fatal hemorrhagic fever

epstein-barr virus

a herpesvirus (species Human herpesvirus 4 of the genus Lymphocryptovirus) that causes infectious mononucleosis and is associated with Burkitt's lymphoma and nasopharyngeal carcinoma —abbreviation EBV

any of the infectious agents that pass through a filter of diatomite or unglazed porcelain with the filtrate and remain virulent and that include the viruses and various other groups (such as the mycoplasmas and rickettsias) which were originally considered viruses before their cellular nature was established

hiv

a filovirus (species Lake Victoria marburgvirus of the genus Marburgvirus) that causes an often fatal hemorrhagic fever and was originally transmitted to humans from green monkeys