Confusion in the interpretation of CD4 among AIDS or HIV +ve patients Hassan H. Dib, Peking University Health Science Center 23 January 2009 It came to my attention while I am reviewing some papers on CD4 among HIV patients with Cryptosporidium, I have found your article and after reviewing it I have had found something a bit confusing. First, in your method you have mentioned that you have measured the levels of CD4 among HIV positive patients, and later then in your tables you have indicated that those reflect AIDS patients. Wouldn't CD4 levels will be totally different between HIV positive and AIDS patients who attracted Cryptosporidium. Plus, wouldn't AIDS patients have a higher tendency than HIV positive patietns to attract opportunisitc infections which will reflect proportionally on the CD4 levels between the two. Competing interests There is no competing interest, just to clarify some misplacement of some information for the readers.