Airborne TB Bacteria Mutate During Drying, Offering New Target to Fight Drug Resistance

Tuberculosis (TB) bacteria that are expelled into the air from infected patients can survive the drying process and even acquire mutations that confer antibiotic resistance, a new study from Weill Cornell Medicine has shown. The research reveals that the bacteria not only endure the harsh conditions of the environment but also generate genetic changes during the airborne phase, making them highly contagious—second only to measles in transmissibility.

The investigators identified specific mechanisms that allow the TB bacilli to withstand desiccation and to mutate while airborne. These findings suggest that transmission is not a simple passive transfer of static organisms but may involve an active evolutionary step, with the pathogen adapting in real time as it moves from one host to another. The study highlights the need to consider these airborne evolutionary dynamics when developing strategies to curb the spread of drug‑resistant TB.