Official website of the Johns Hopkins Antibiotic (ABX), HIV, Diabetes, and Psychiatry Guides, powered by Unbound Medicine. Johns Hopkins Guide App for iOS, iPhone, iPad, and Android included. Explore these free sample topics:
-- The first section of this topic is shown below --
Number of CD4 cells (T-helper lymphocytes with CD4 cell surface marker), used to assess immune status, susceptibility to OIs, urgency of ART, need for OI prophylaxis, and for defining AIDS (CD4 < 200).