- H -
- HA1 virus
- HA2 virus
- hand-foot-and-mouth disease virus
- Hantaan virus
- hard pad virus
- helper virus
- hemadsorption virus type 1
- Hendra virus
- hepatitis A virus (HAV)
- hepatitis B virus (HBV)
- hepatitis C virus (HCV)
- hepatitis D virus (HDV)
- hepatitis delta virus (HDV)
- hepatitis E virus (HEV)
- hepatitis G virus (HGV)
- hepatitis GB virus (HGBV)
- hepatitis virus
- herpangina virus
- herpes simplex virus (HSV)
- herpes virus
- herpes zoster virus
- herpes-like virus (HLV)
- herpes-type virus (HTV)
- hog cholera virus
- horsepox virus
- human B lymphotropic virus (HBLV)
- human immunodeficiency virus (HIV)
- human immunodeficiency virus-2
- human T lymphotrophic virus
- human T-cell leukemia-lymphoma virus (HTLV)
- human T-cell lymphoma/leukemia virus
- human T-cell lymphotropic virus
- human T-cell lymphotropic virus type I (HTLV-I)
- human T-cell lymphotropic virus type II (HTLV-II)
- human T-cell lymphotropic virus type III (HTLV-III)
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