#retrovirus
- AIDS — International medical acronym for 'Acquired Immunodeficiency Syndrome', a chronic and potentially life-threatening condition caused by the human immunodeficiency virus (HIV). The virus structurally destroys the cells of the immune system, depriving the body of its capacity to fight opportunistic infections and malignancies, with the AIDS stage representing the advanced clinical phase of the infection.
- Amphotropic — Describing plant ovules: an accepted orthographic variant for 'amfitrop', describing a structure strongly bent in a horseshoe shape; in virology, describing a virus (especially a retrovirus) capable of infecting and structurally replicating within both the cells of its original host species and cells of different species, exhibiting a dual tropism.