Antibiotic resistance among germs swells during droughts, study suggests

A new study in Nature Microbiology suggests that drought conditions significantly increase antibiotic resistance in soil bacteria - and that this environmental shift correlates with higher rates of drug‑resistant infections in hospitals worldwide. Researchers at Caltech found that as soil dries, natural antibiotics produced by microbes become more concentrated, killing off susceptible bacteria and enriching resistant strains. Because soil microbes and clinical pathogens frequently share identical resistance genes, this environmental pressure may be feeding directly into hospital‑level resistance. Analysis of over 100 hospitals showed a strong correlation between drought severity and resistant infections, even after accounting for economic factors. The findings highlight a potential climate‑driven pathway for the spread of antibiotic resistance, suggesting that combating drug‑resistant infections may require addressing climate change itself.

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