<prompt> Mycobacterium avium complex infections are common when the CD4 counts in cellsmm3 are2002005050  <response>: The CD4 T-cell count can define the risk of infection with specific organisms. As a rule of thumb, bacterial and tubercular infections are more likely at higher CD4 counts 200 cellsmm3. Pneumocystis pneumonia usually strikes at CD4 counts below 200 cellsmm3, while cytomegalovirus and Mycobacterium avium complex infections are uncommon until the very late stages of immunosuppression CD4 counts 50 cellsmm3. 