Skip navigation

Study reveals evidence that bacteria can live in snake and spider venoms

23rd May 2022

Newly published research led by Northumbria University shows that, contrary to what is commonly believed, the venom of snakes and spiders is actually populated with microbes, including bacteria that could cause infection in people who have suffered a bite.

For decades scientists have thought that animal venom is an entirely sterile environment due to it being full of antimicrobial substances - materials that can kill bacteria.

However, new scientific evidence from research led by Northumbria University Associate Professor in Cellular and Molecular Sciences, Sterghios Moschos and venom biologist Steve Trim, Founder and CSO of biotechnology company Venomtech, has shown that this is not the case.

The work, published today in scientific journal Microbiology Spectrum demonstrates how adaptable microorganisms are. The study provides strong genetic and culture evidence that bacteria can not only survive in the venom glands of several species of snakes and spiders, but can also mutate to resist the notoriously toxic liquid that is venom.

The findings also suggest that victims of venomous animal bites may therefore also need to be treated for infections, not just antivenom to tackle the toxins deposited through the bite.

The publication of the study follows the news that Northumbria University’s research power continues to grow with results from the Research Excellence Framework (REF2021) showing Northumbria University with the biggest rise in research power ranking of any UK university. Its research power ranking rose to 23rd, having previously risen to 50th in 2014 from 80th in 2008, making Northumbria the sector’s largest riser in research power ranking for the second time.

 

Challenging the dogma of venom sterility

Seeking to address a gap in research, Dr Moschos and colleagues investigated the venom of five snake and two spider species. “We found that all venomous snakes and spiders that we tested had bacterial DNA in their venom,” explained Dr Moschos.

“Common diagnostic tools failed to identify these bacteria correctly - if you were infected with these, a doctor would end up giving you the wrong antibiotics, potentially making matters worse.

“When we sequenced their DNA we clearly identified the bacteria and discovered they had mutated to resist the venom. This is extraordinary because venom is like a cocktail of antibiotics, and it is so thick with them, you would have thought the bacteria would not stand a chance. Not only did they stand a chance, they had done it twice, using the same mechanisms,” added Dr Moschos.

“We also directly tested the resistance of Enterococcus faecalis, one of the species of bacteria we found in the venom of black-necked spitting cobras, to venom itself and compared it to a classic hospital isolate: the hospital isolate did not tolerate the venom at all, but our two isolates happily grew in the highest concentrations of venom we could throw at them.”

 

Implications for clinical treatment

2.7 million venomous bite-related injuries occur annually, predominantly across Africa, Asia and Latin America. Of these, it is thought that 75% of victims will develop infections in venom toxin-damaged tissue, with bacteria Enterococcus faecalis being a common cause of disease.

These infections have previously been thought to be a consequence of having an open wound from the bite, as opposed to the infection-causing bacteria having come from the venom itself.

The researchers say that their study shows the need for clinicians to consider treating snakebite victims not just for tissue destruction, but for infection too, as quickly as possible.

Steve Trim of Venomtech added: “By exploring the resistance mechanisms that help these bacteria survive, we can find entirely new ways of attacking multi-drug resistance, potentially through engineering antimicrobial venom peptides.”

The paper, ‘Bacterial Adaptation to Venom in Snakes and Arachnida’, is published in open-access journal, Microbiology Spectrum, an American Society for Microbiology publication. The paper and full list of authors can be found on Microbiology Spectrum's website

comments powered by Disqus

Applied Sciences

The Department of Applied Sciences has an exciting and extensive portfolio of subjects including biology, biomedical sciences, chemistry, forensic science, food and nutritional sciences.

News and Features

This is the place to find all the latest news releases, feature articles, expert comment, and video and audio clips from Northumbria University

REF 2021

Northumbria has submitted 1096 staff across thirteen Units of Assessment (UoA) to the Research Excellence Framework (REF) 2021. This submission reflects our research across four Faculties and nineteen Departments, incorporating traditional disciplines, such as English and Engineering, modern disciplines, such as Business and Design, and professional disciplines, such as Architecture and Nursing.

a sign in front of a crowd
+

Northumbria Open Days

Open Days are a great way for you to get a feel of the University, the city of Newcastle upon Tyne and the course(s) you are interested in.

Research at Northumbria
+

Research at Northumbria

Research is the life blood of a University and at Northumbria University we pride ourselves on research that makes a difference; research that has application and affects people's lives.

a person sitting at a table
+

Order your prospectus

If you would like to know more about our courses, or life in general as a student at Northumbria, then we can help you.

Latest News and Features

Help to Grow Management event at BALTIC marking the one-year anniversary of its 'Why Small Business Matters' podcast with a real time episode
a tall building
Matty GarmGems
PhD student Rana Faisal Shahzad and Dr Shahid Rasul discussing a CO2 recycling project with Dan Ferguson of SUEZ recycling and recovery UK, at the SUEZ plant in North Tyneside.

Back to top