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Delays in diagnosing Tuberculosis (TB) are associated with increased transmission. TB may present as a clinical syndrome that mimics community-acquired pneumonia (CAP). The aim of this paper was to determine frequency of TB among patients with CAP at a referral hospital in Gaborone, Botswana. We performed a retrospective study of adults presenting with CAP from April 2010-October 2011 to the Emergency Department (ED); we matched this cohort to the National Botswana Tuberculosis Registry (NBTR) to identify individuals subsequently diagnosed with TB. We assessed demographics, time to TB diagnosis, clinical outcomes and performed logistic regressions to identify factors associated with TB diagnosis. We identified 1305 individuals presenting with CAP; TB was subsequently diagnosed in 68 (5.2%). The median time to TB diagnosis was 9.5 days. Forty percent were AFB sputum smear positive and 87% were identified as being HIV-positive. Subsequent diagnosis of TB is common among individuals with CAP at our ED, suggesting that TB may be present at the time of CAP presentation. Given the lack of distinguishing clinical factors between pulmonary TB and CAP, adults presenting with CAP should be evaluated for active TB in Botswana.

Tuberculosis among individuals with community-acquired pneumonia presenting to emergency in Gaborone, Botswana