<prompt> prophylaxis for Pneumocystis carinii is indicated in HIV positive patents When CD4 count is-300 cellsmm3200 cells mm3100 cellsmm350 cells mm3  <response>: Low CD4 count correlated with risk of PCP p 0.0001; 79 had CD4 counts less than 100microl and 95 had CD4 counts less than 200microl. Bacterial pneumonia has been linked to several HIV-related factors, including CD4 counts, having an uncontrolled viral load, and not being on antiretroviral therapy. HIV-positive people with a weak immune system, paicularly a CD4 count below 200 cellsmm3, are at greatest risk. Ref Harrison20th edition pg 1107 