Droughts swell antibiotic resistance, study suggests

A new study published in Nature Microbiology reveals a concerning link between drought conditions and the rise of antibiotic resistance. Researchers at Caltech found that dry soil environments naturally select for and enrich antibiotic-resistant bacteria. As soil dries, existing antibiotics become more concentrated in remaining moisture pockets, killing off susceptible bacteria and allowing resistant strains to thrive. This phenomenon is particularly worrying as climate change is projected to increase the frequency and severity of droughts globally. The study also identified a correlation between drought conditions in regions surrounding hospitals and higher rates of antibiotic-resistant infections, suggesting a potential pathway for environmental resistance to impact public health.