October 2017 NUI Galway Provide First Definitive Identification Guide on False Widow Spider Bites

Researchers from the Ryan Institute at NUI Galway have developed the world’s first verified identification guide and symptoms checklist for General Practitioners and the public on how to treat bites from the False Widow spider.

The study was recently published in two separate research papers in international journals, one in the journal, Biology and Environment, which showed that the False Widow spider
(Steatoda nobilis) is taking over Ireland and is an invasive species with a detrimental effect on native species. This study also featured on the journals front cover. The second journal, Clinical Toxicology showed five reported cases of False Widow bites in the UK and Ireland that have provided the world’s first verified identification guide on how to treat bites from this spider.  

Led by Dr Michel Dugon, the research team based at the Venom Systems and Proteomics laboratory in NUI Galway made the discovery while investigating the potential of local bugs that included the venom from the False Widow spider, as a source of novel therapeutics to develop medication to treat illnesses ranging from bacterial infection to cancer.

This is the only laboratory in the world currently working on extracting venom from The False Widow spider for potential therapies. This particular species of spider is having a detrimental effect on other local species and spiders in Ireland due to their competitiveness and fast breeding nature. The False Widow lives for five to seven years whereas most other spider and bug species in Ireland only lives for a maximum of one year. In Ireland False Widow spiders live close to buildings and houses inhabited by people, they only survive in cities and not in rural areas. Dublin, Cork and Wexford have the highest number of False Widows to date.

Dr Michel Dugon, lead author of the study from the Ryan Institute at NUI Galway, said: “While it is extremely unlikely that a bite will ever be fatal, we do need to consider bites from False Widows as a potential health risk given the increase of this species not just in the UK and Ireland but also mainland Europe and the US. We hope that our study will help to address some of the public’s concerns about these spiders and will provide healthcare professionals with the information required to accurately diagnose and report bites associated with the False Widow.”

The False widow spider arrived in the UK about 100 years ago and has steadily invaded Ireland over the past 20 years through human transport of goods, a by-product of globalisation. The first true case of a False Widow spider bite was identified in the UK in the 1990’s and in Chile last year. There has since been five additional reported cases, three in Ireland and two in the UK, leading to the NUI Galway study being the most intensive research carried out on this species to date.

Bites from a False Widow spider are not fatal with identified symptoms resulting in a large swelling within three minutes of being bitten, sometimes followed by the formation of a dry necrotic wound when the swelling subside, and inflammation for a few days afterwards. The venom from a False Widow spider is a lot more powerful than the researchers expected, producing about one tenth of a millionth of a litre of venom.

This study was funded by the Irish Research Council.

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https://youtu.be/3YEaGnl4Mlg