PersistentMycobacterium tuberculosisbioaerosol release in a tuberculosis-endemic setting

Abstract

AbstractPioneering studies linking symptomatic disease and cough-mediated release ofMycobacterium tuberculosis(Mtb) established the infectious origin of tuberculosis (TB), simultaneously informing the pervasive notion that pathology is a prerequisite forMtbtransmission. Our prior work has challenged this assumption: by sampling TB clinic attendees, we detected equivalent release ofMtb-containing bioaerosols by confirmed TB patients and individuals not receiving a TB diagnosis, and we demonstrated a time-dependent reduction inMtbbioaerosol positivity during six-months’ follow-up, irrespective of anti-TB chemotherapy. Now, by extending bioaerosol sampling to a randomly selected community cohort, we show thatMtbrelease is common in a TB-endemic setting: of 89 participants, 79.8% (71/89) producedMtbbioaerosols independently of QuantiFERON-TB Gold status, a standard test forMtbinfection; moreover, during two-months’ longitudinal sampling, only 2% (1/50) were seriallyMtbbioaerosol negative. These results necessitate a reframing of the prevailing paradigm ofMtbtransmission and infection, and may explain the current inability to elucidateMtbtransmission networks in TB-endemic regions.SummaryElucidating chains ofMycobacterium tuberculosistransmission is limited by a dependence on linking sputum-positive tuberculosis cases. Here, we report persistentM. tuberculosisbioaerosol release in the majority of a randomly selected community cohort. The contribution to tuberculosis transmission is unknown.