Scientists have warned of a surge in noble false widow spider bites, with hospital admissions doubling as the species expands its range across the UK and Ireland. A new study published in Clinical Toxicology confirms that bites can cause severe symptoms similar to those of the true black widow spider, requiring medical treatment.
The noble false widow, originally from Madeira and the Canary Islands, has become one of the most common spiders in urban areas of Britain and Ireland. Researchers from NUI Galway have established a DNA database to help clinicians identify the species. The study found that symptoms of envenomation range from mild pain and swelling to severe cases involving tremors, blood pressure changes, nausea, and impaired mobility. In rare instances, victims have developed wounds or severe bacterial infections.
Dr Michel Dugon, senior author of the study, noted the spider's adaptability and competitiveness, stating, 'Two decades ago, this species was almost unknown in Ireland, the UK or in continental Europe. One thing is certain though, this species is here to stay, and we must learn how to live with it.' The increase in numbers is attributed to a possible genetic mutation and global trade, rather than climate change.
Lead author Dr John Dunbar urged bite victims to photograph the spider for identification, saying, 'Our latest study confirms without a doubt that noble false widows can cause severe envenomations. While most cases will have a mild outcome, we need to continue to closely monitor bites to understand the potential range of symptoms and to treat severe cases when they occur.'
