A low CD4 count does not predict progression to AIDS but does indicate increased chance of oppounistic infection such as those listed. Kaposi's sarcoma, which has been linked to herpesvirus typ 8, pneumocystis, and mycobacterial disease are three of the most prevalent oppounistic infections. While HIV- positive patients contract pneumococcal pneumonia, they are probably at no more risk than the general population, as protection against pneumococcal disease is linked to the presence of anticapsular antibody.