Climate Change Fuels Salmonella Superbugs

The climate crisis is accelerating a concerning global rise in antibiotic resistance, particularly in salmonella, according to a comprehensive study. Researchers have established a link between climate change and a notable 10% increase in salmonella antibiotic resistance genes worldwide from 1940 to 2023.

While the overuse and misuse of antibiotics are primary causes of resistance, the study highlights that environmental shifts are exacerbating the problem. Rising temperatures and changing precipitation patterns non-linearly amplify the abundance and dissemination of these resistance genes. This suggests that environmental changes speed up bacterial adaptation to antibiotics.

The research analyzed more than 480,000 salmonella samples from 139 countries. Significant increases in antibiotic resistance genes were observed in 82% of the countries studied, with the strongest climate-associated rises in the Middle East, North Africa, South Asia, and sub-Saharan Africa.

Experts emphasize that urgent action is required. This includes integrating climate change mitigation policies, particularly those aligned with the Paris Agreement, with enhanced antimicrobial stewardship and One Health surveillance to effectively curtail the future burden of antimicrobial resistance.