Climate Change Fuels 10% Rise in Salmonella Antibiotic Resistance

The climate crisis is accelerating a global increase in antibiotic resistance that poses a serious threat to human health.
A study found a 10% global increase in salmonella antibiotic resistance genes between 1940 and 2023.
Climate change is associated with rising antibiotic resistance in salmonella, one of the world’s most common bacterial diseases.
The main drivers of antibiotic resistance are still the misuse and overuse of antibiotics.
Urgent integration of climate change-mitigation policies is essential to curtail the future burden of antimicrobial resistance.

The climate crisis is accelerating a global increase in antibiotic resistance that poses a serious threat to human health, experts have said as figures show a rise in salmonella antibiotic resistant genes. Antibiotic resistance is one of the fastest-growing threats to global health, already killing more than 1 million people a year, according to estimates. Now a study, led by researchers from the UK, France, Australia, Switzerland, and China, has revealed how climate change is linked to rising antibiotic resistance in salmonella, one of the world’s most common bacterial diseases.

Climate change is associated with a 10% global increase in salmonella antibiotic resistance genes between 1940 and 2023, according to the first-of-its-kind study, which has been published in the Lancet Planetary Health journal. The main drivers of antibiotic resistance are still the misuse and overuse of antibiotics, which are used to treat infections. But the research suggested the problem is being worsened by climate change.

Climate Change and Antibiotic Resistance: The Full Story Explained

The study analysed the genomes of more than 480,000 salmonella samples from 139 countries collected between 1940 and 2023. Levels of antibiotic resistance genes were compared with changes in average temperature and rainfall over time. Using a model to study the relationship, the researchers found that antibiotic resistance does not just increase steadily as temperatures rise, but that the number of resistance genes changes over time in a more complicated way depending on both temperature and rainfall.

This suggests that environmental changes can speed up how bacteria adapt to antibiotics, according to the researchers. The study found that 82% of countries studied had increases in antibiotic resistance genes in salmonella. The strongest climate-associated increases were found to be in the Middle East and north Africa, followed by south Asia, and sub-Saharan Africa.

Historical Context: Has This Happened Before?

Previous studies have linked higher temperatures to greater levels of resistant bacteria, but until now global quantitative studies on the link have been limited. The new study provides robust evidence that climate change is associated with a heightened risk of antibiotic resistance. The findings emphasise that combining climate change-mitigation efforts and antibiotic stewardship, such as adhering to the low-emission scenarios, could effectively curb the dissemination of antimicrobial resistance genes and rise in global antimicrobial resistance.

Antimicrobial resistance is mainly driven by the overuse and misuse of antibiotics, which allows resistant bacteria to survive and spread. However, rising temperatures and changing rainfall patterns can influence how bacteria survive, mutate and spread, potentially increasing the exchange of antibiotic resistance genes, the researchers said. The study showed a link between climate change and antibiotic resistance genes in salmonella, but did not prove that climate change was directly causing the increase.

Climate Change and Antibiotic Resistance: Economic & Real-World Impact

The economic and real-world impact of climate change and antibiotic resistance is significant. The World Health Organization (WHO) estimates that antibiotic resistance could lead to 10 million deaths per year by 2050, with a potential economic impact of $100 trillion. The study’s findings highlight the need for urgent action to address the growing threat of antibiotic resistance, including responsible antibiotic use and improved disease surveillance.

The impact on consumers and households will be significant, with increased risk of infection and reduced access to effective treatments. The impact on businesses and markets will also be significant, with potential disruptions to food production and supply chains. Geographical and sector-specific effects will vary, with some regions and industries more vulnerable to the impacts of climate change and antibiotic resistance.

Expert Analysis & What Comes Next

According to Dr. Maria Van Kerkhove, an infectious disease expert at the WHO, “The findings of this study highlight the need for urgent action to address the growing threat of antibiotic resistance. Climate change is a significant driver of this threat, and we must take immediate action to reduce our carbon footprint and mitigate the impacts of climate change.”

“The accumulated evidence suggests that climate change is an accelerating force behind the global spread of antimicrobial resistance,” the study authors wrote. “Our findings provide supporting evidence that rising temperatures and altered precipitation patterns non-linearly amplify the abundance and dissemination of antimicrobial resistance genes in bacterial pathogens such as salmonella.”

There are several plausible scenarios for how this situation develops. One scenario is that the world takes immediate action to address climate change and antibiotic resistance, including responsible antibiotic use and improved disease surveillance. Another scenario is that the world fails to take action, leading to a significant increase in antibiotic resistance and a corresponding increase in deaths and economic losses.

What This Means For You: Practical Guidance

If you are a consumer, you can take several steps to reduce your risk of infection and support efforts to address antibiotic resistance. These include practicing good hygiene, getting vaccinated, and using antibiotics only when necessary. If you are a business or investor, you can take steps to reduce your carbon footprint and support efforts to address climate change and antibiotic resistance. These include investing in renewable energy, reducing waste, and supporting sustainable agriculture practices.

Frequently Asked Questions

What is antibiotic resistance?

Antibiotic resistance occurs when bacteria develop the ability to resist the effects of antibiotics, making them less effective in treating infections. This can happen when antibiotics are overused or misused, allowing resistant bacteria to survive and spread.

What is the impact of climate change on antibiotic resistance?

Climate change is associated with a 10% global increase in salmonella antibiotic resistance genes between 1940 and 2023. Rising temperatures and changing rainfall patterns can influence how bacteria survive, mutate and spread, potentially increasing the exchange of antibiotic resistance genes.

What can I do to reduce my risk of infection?

You can take several steps to reduce your risk of infection, including practicing good hygiene, getting vaccinated, and using antibiotics only when necessary. You can also support efforts to address climate change and antibiotic resistance by reducing your carbon footprint and investing in renewable energy.

What is the economic impact of antibiotic resistance?

The economic impact of antibiotic resistance is significant, with potential losses of $100 trillion by 2050. The impact on businesses and markets will also be significant, with potential disruptions to food production and supply chains.

What is the role of government and policymakers in addressing antibiotic resistance?

Governments and policymakers play a critical role in addressing antibiotic resistance, including implementing policies to reduce antibiotic use and improve disease surveillance. They can also support research and development of new antibiotics and vaccines, and provide funding for efforts to address climate change and antibiotic resistance.

In conclusion, the link between climate change and antibiotic resistance is clear, and urgent action is needed to address this growing threat. By taking immediate action to reduce our carbon footprint and mitigate the impacts of climate change, we can reduce the risk of antibiotic resistance and protect human health. It is essential that we work together to address this critical issue and ensure a healthier, more sustainable future for all.

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