Following emotional head-lines of certain articles in the press, making believe that the cat could be susceptible to the AIDS virus, the authors present elements of comparison between principal feline retroviruses (the feline leucosis virus and the feline immunodeficiency virus) and the two human immunodeficiency viruses (HIV). The feline leucosis virus in differentiated from the human and the feline immunodeficiency viruses by its virological, pathological and epidemiological characteristics. Being close to the AIDS virus in the taxonomy of retroviruses, the feline immunodeficiency virus (FIV) presents a number of similarities with the HIV. Therefore, the FIV could give rise to interests in its use as a model in the study of AIDS. Whatever the factors of resemblances may be, there are no elements of present knowledge in favor of an inter-species contamination (cat-man); on the contrary, these viruses demonstrate a marked species specificity.