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Home Antibiotic Resistance

80% cut in antibiotics entering Thames is needed to avoid surge in superbugs

endopromag_adn by endopromag_adn
September 28, 2023
in Antibiotic Resistance
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80% cut in antibiotics entering Thames is needed to avoid surge in superbugs

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The amount of antibiotics entering the River Thames would need to be cut by as much as 80% to avoid the development and spread of antibiotic-resistant “superbugs,” a new study has shown.

Scientists from the Centre for Ecology and Hydrology (CEH) modeled the effects of antibiotic prescriptions on the development of antibiotic-resistant bacteria in a river. It found that across three-quarters of the River Thames catchment, the antibiotics present, due to effluent discharge, were likely to be at levels high enough for antibiotic-resistant bacteria to develop.

The study comes after England’s chief medical officer professor Dame Sally Davies warned last week that bugs resistant to antibiotics could pose a more immediate risk to humanity than climate change, and might kill at least 10 million people a year across the world.

Dr. Andrew Singer of the Centre for Ecology and Hydrology, who led the study, said, “Rivers are a ‘reservoir’ for antibiotic-resistant bacteria which can quickly spread to people via water, soil, air, food and animals. Our beaches offer a similar risk. It has been shown that surfers are four times more likely to carry drug-resistant bacteria than non-surfers.”

How antibiotics get into our rivers

Up to 90% of prescribed antibiotics taken by people pass through the body and into the sewerage system, where about half end up in rivers when effluent is discharged.

“The release of drugs and bugs into our rivers increases the likelihood of antibiotic-resistant genes being shared, either through mutation or ‘bacterial sex’. This is the first step toward the development of superbugs as the drugs used to fight them will no longer work,” Singer explained.”

“Environmental pollution from drugs and bugs is a serious problem that we need to find solutions to.”

The CEH-led research was based on prescription data from clinical commissioning groups for two classes of antibiotics–macrolides, such as erythromycin and azithromycin, and fluoroquinolones such as ciprofloxacin, levofloxacin and moxifloxacin.

Macrolides treat a range of respiratory and sexually transmitted infections such as pneumonia, whooping cough and chlamydia, while fluoroquinolones treat respiratory and urinary tract infections. These were chosen for the study because they biodegrade slowly while other antibiotics such as penicillin biodegrade before they get to the river.

Possible solutions

There are a number of different ways to could reduce the amount of antibiotics entering rivers, including:

  • Reducing inappropriate prescriptions, either because the antibiotics will not reduce the infection, or the course of treatment is longer than is medically necessary.
  • Preventative action so fewer medicines are needed in the first place, such as more rapid diagnosis of medical conditions, greater uptake of vaccinations for illnesses and better hygiene controls in hospitals.
  • Increased investment in research and development of new wastewater treatment processes that would remove the drugs and bugs from sewage.

The Government and health officials recognize that reducing antibiotic prescribing is key to tackling antibiotic resistance, and there was a 6.1% reduction in total antibiotic consumption in primary and secondary care in England between 2014 and 2018.

However, antibiotics prescriptions per person in the UK per person is still higher than several European countries and double that of the Netherlands, where their controls on prescribing antibiotics and effective hygiene measures in the healthcare system have resulted in relatively low rates of antibiotic resistance.

The study is published in the journal PLOS ONE.

Source: Centre for Ecology and Hydrology

Tags: Bacteria
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