Natural immunity to Haemophilu influezae type b in health infants of Al Ain, UAE

The impact of changes in 1993 of the old 1987 WHO/CDC AIDS case definition was studied in a cohort of 153 HIV-infected injection drug users (IDUs) and 502 HIV-infected homosexual men in Amsterdam. It appeared that the extension in Europe of the old AIDS definition to also include recurrent pneumonia, pulmonary tuberculosis and invasive cervical neoplasia, strongly increases the number of persons diagnosed with AIDS among IDUs, but will hardly influence the AIDS incidence among homosexual men. As recurrent pneumonia and pulmonary tuberculosis are present among drug users with high CD4 cell counts, the incidence of these diseases may partly be determined by environmental factors. The extension of the old 1987 AIDS definition in the USA with CD4 count <200 cells/mm3 In addition to the 3 above-mentioned diseases, will also have a larger impact on drug users than on homosexual men.