New research published this week estimates over 6.3 million water sports sessions, such as swimming or surfing, resulted in one type of antibiotic resistant bacteria being ingested across England and Wales.

In the first study of its kind, scientists at the University of Exeter Medical School have assessed the amount of water ingested during different water sports, and combined this with water sampling data to estimate people’s exposure to bacteria resistant to antibiotics.

The research, which is being presented today at the Society for General Microbiology’s Annual Conference, focused on the prevalence of Escherichia coli (E. coli) and specifically considered those resistant to an important class of antibiotics, known as third-generation cephalosporins – or 3GCs.

The scientists considered surfers, sea swimmers, divers and kayakers and found that while only 0.12% of E. coli found in coastal waters and rivers running into beaches were resistant to 3GCs, this number was enough to present a potential risk of exposure to water users. Surfers and sea swimmers were among those at highest risk of exposure, due to their tendency to swallow more water.

The project was led by microbiologist, Dr William Gaze, who believes these findings represent just part of the story:

“We know very little about how the natural environment can spread antibiotic resistant bacteria to humans, or how our exposure to these microbes can affect health. People are exposed to antibiotic resistant bacteria in many ways, through person to person contact, via food and as a result of international travel. Our research establishes recreational use of coastal waters as an additional route of exposure. With millions of people visiting beaches in England and Wales each year, there is a risk of people ingesting 3GC resistant E. coli, and it looks like water-users’ exposure to all resistant bacteria could be even higher.”

The study also showed that people’s risk of exposure to resistant bacteria is closely related to water quality at a given beach, demonstrating the importance of the EU Bathing Water Directive which aims to ensure good water quality standards.

Antibiotic resistant bacterial infections pose a serious threat to human health and the study’s authors are currently working to investigate the link between recreational exposure in the sea, colonisation in the body and infection. Senior Medical Professionals, including the government’s chief medical officer for England, list resistance to antibiotics as a significant threat to the nation and should be ranked alongside terrorism. The scientists hope their findings will increase the understanding of the potential health risks water users face. Another of the study’s authors, Anne Leonard, said:

“Although this research has established that coastal waters are a potential source of exposure to antibiotic resistant bacteria, we’re not recommending that people stop visiting the beach. Exercise and enjoyment of the natural environment has many established benefits for health and wellbeing, and this kind of research will help us ensure people can still make the most our coastal resources.”

Surfers Against Sewage have been working with the European Centre for the Environment and Human Health, part of the University of Exeter Medical School, to collect data regarding the human health effects of marine pollution.  The findings of this study will be published in 2016.

This summer we will be collaborating with the Centre to further explore antibiotic resistant bacteria in the ‘Beach Bums’ study.  We will be recruiting 300 volunteers from England and Wales (150 surfers/ body boarders; and 150 non sea users) and samples will be taken to test the link between exposure to coastal waters and the presence of antibiotic resistant bacteria.  Volunteers will be invited to participate in the study at various beach locations and events around the South West and also through events held by our Regional Reps.  If you are interested in learning more or wish to volunteer in this important scientific study please contact our Campaign Officer, David Smith: [email protected]