Retroviral vaccines. How close is C to D?
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D006801:Humans; D012190:Retroviridae / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology; D014765:Viral Vaccines / Q000276:immunology*
D014614:Vaccines, Synthetic; D014765:Viral Vaccines