To the Editor: While there have been impressive gains in the global control of tuberculosis (TB) over the past two decades, TB remains a leading cause of death and efforts to decrease its burden have been limited by the rise of drug resistant strains [1]. As drug-resistant TB remains exceedingly difficult and costly to treat, more research is needed to identify areas for improving primary prevention of TB. The risk of TB transmission is increased whenever there is overcrowding, poor ventilation and exposure to an infected individual, and public transport has been identified as a potential setting with increased risk for TB transmission [2]. Indeed, recent research demonstrates the fraction of rebreathed air on public transport is mathematically correlated with a higher risk of contracting TB [3].
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