title: What immunity can protect against HIV infection.
authors.forename: N L
authors.initials: NL
authors.lastname: Letvin
mesh_terms: D000818:Animals; D015658:HIV Infections / Q000276:immunology*; D006801:Humans; D007109:Immunity; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*