Studie legt nahe, dass die Antibiotikaresistenz von Keimen während Dürreperioden zunimmt | Dürre führt zu einer erhöhten Antibiotikaresistenz in allen Böden

Highlights from the article:

>A series of experiments by researchers at the California Institute of Technology found that dry soil—drought conditions—consistently select for and enrich antibiotic resistance in soil bacterial communities. More concerningly, the researchers found that pro-resistance conditions in soil link to higher frequencies of antibiotic-resistant infections in hospitals around the world. And with human-driven climate change, drought conditions are expected to increase. Assuming the link is real, projections indicate that drought-threatened regions across the globe will face heightened emergence of antibiotic resistance.
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>While the authors acknowledge that more research is needed to confirm the connections, “our study offers a clear example of how climate change has the potential to intersect with microbial ecology to shape public health outcomes,” they conclude.
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>The underlying mechanism hypothesized to explain this connection is a fairly simple one: as soil dries, natural antibiotics produced by soil microbes reach higher concentrations in the remaining pockets of moisture. Those higher concentrations, in turn, select for bacteria that can resist the antibiotics.
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>The researchers note that not only are soil bacteria and clinical pathogens known to share the same resistance genes, there are examples of the genetic sequence of those genes being 100 percent identical across the strains found in soils and hospitals. The genetic flow between the environmental microbes and clinical pathogens is thought to occur through a variety of pathways, including through agriculture, recreation, and simple dust inhalation.
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>The researchers collected data on antibiotic-resistant infections in over 100 hospitals across the world and looked at the soil conditions in the areas around those hospitals. They found a strong correlation between increased frequency of resistant clinical isolates and drought conditions. The association held up when researchers accounted for economic factors.
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>In all, the findings offer a warning that we may need a broader approach to combating the rise of antibiotic resistance. “Effective strategies must recognize that antibiotic stewardship in hospitals, while crucial, may not be enough if we neglect stewardship of the planet’s changing climate,” he concluded.

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Link to research article:

[Drought drives elevated antibiotic resistance across soils](https://www.nature.com/articles/s41564-026-02274-x)

Abstract:

>Antibiotic resistance is a growing threat to human health and is often attributed to excessive clinical usage that selects for resistance. Although many antibiotics are derived from soil microorganisms, how environmental changes to soil ecosystems might promote resistance is poorly understood. Here we establish drought as a driving force of antibiotic resistance in the soil, with potentially far-reaching public health consequences. Across various geographic regions and soil types, we consistently observe metagenomic signatures of enrichment for antibiotic producers under drought conditions. Experimentally, we demonstrate that drought-induced lowering of water content concentrates natural antibiotics, thereby intensifying selection against sensitive strains and favouring antibiotic-resistant bacteria. Using clinical surveillance data from 116 countries, we show that the average frequency of hospital antibiotic resistance is strongly correlated with the local aridity index, even after controlling for regional income differences. Together, our findings reveal an underrecognized link between climate factors and antibiotic resistance.