Answer :
because hiv virus has no definte shape so no proper medicine for it and loose their immunity power against diseases and die
THE AIDS VIRUS OR HIV DIRECTLY AFFECTS OUR IMMUNE SYSTEM WHICH PROTECTS OUR BODY FROM THE PATHOGENS THUS DIFFERENT DISEASES AFFECTS US THE AIDS VIRUS STOPS THE FUNCTIONING OF THE B LYMPHOCYTES WHICH INFORMS THE T LYMPHOCYTES AND THE WHITE BLOOD CELLS ABOUT THE ACTION OF THE PATHOGENS. IN SUCH MEDICINES ALSO DON'T WORK