Superbugs on rise as climate change drives antibiotic resistance, study finds

In recent years, antimicrobial resistance has emerged as a deadly threat to public health.

According to the World Health Organization (WHO), antimicrobial resistance (AMR) has shifted from a "silent pandemic" to an immediate global health crisis.

According to a 2024 study published in The Lancet, between 2025 and 2050, 39 million deaths are expected to be directly attributable to AMR.

In a new study published in Nature Microbiology, the researchers have found its link with climate change.

According to researchers at Caltech, climate change-driven drought is a significant yet overlooked driver of antibiotic resistance.

For years, drug resistance has often been blamed on the clinical misuse of antibiotics, but this research highlights an “ecological pathway.”

Drought as selective pressure

In the ecological pathway, dried soil is responsible for creating high concentrations of natural antibiotics in the remaining moisture. The high concentration becomes intolerable for weak bacteria, allowing antibiotic-resistant strains to thrive and multiply.

Soil-to-clinic link

The researchers have found a direct genetic connection between human pathogens and soil bacteria after analyzing the data over 100 hospitals globally. They found that antibiotic-resistance genes in hospitals are 100 percent identical to those found in local soils.

Various channels such as agriculture, outdoor recreation, and the inhalation of dust are responsible for transmission.

"Droughts are creating the same effects as overuse of antibiotics in the clinic: They both drive selection for antibiotic resistance," said Dianne Newman, professor of biology and geobiology at Caltech.

This study highlights that to combat growing antibiotic resistance worldwide, we must also address the threatening realities of climate change.