This infection is called parasites. Cryptosporidium parvum infection can cause symptoms of the disease in HIV-infected patients with CD4 cell counts less than 200 CD4 cells until more than 200 diseases caused by bacteria. Cryptosporidium parvum is gone in 1-3 weeks, although the symptoms are gone, but you still have it, and you can spread the infection to others. And when you do, it will cause your CD4 count is low.