CD4 and pulmonary tuberculosis: Worldwide, tuberculosis (TB) is prevalent, particularly amongst patients with HIV, and it has been estimated that up to 70% of patients will develop TB in their lifetime.6 As detailed above, the chance of developing TB greatly increases with a fall in CD4 count, with the threshold being approximately 200 cells/μL.6 Gastrointestinal manifestations are typically secondary to pulmonary TB.14