Spiders or scapegoats

Note: For reporters who are not located in the North America, the embargo time is 0001 H (London time) Friday 6 August 2004.

Author Geoffrey Isbister (Newcastle Mater Misericordiae Hospital, Australia) comments: "Putting aside emotion and dislike for these creatures, and based on a rational assessment of the risks, the fear or concern about spiders is unfounded. Most spiders do not pose a medical risk. Even spiders that can cause clinically significant human envenoming cause very little mortality or severe morbidity. Scorpions are responsible for a far greater burden of illness worldwide. In Australia and the USA, bee and wasp stings account for many more deaths than spider bites. Spiders can also be compared with cars. The fear of cars is rare, and there are few myths about the medical effects of car travel even though more deaths occur from motor vehicle accidents each year than from spider bites, and people take a great risk every time they travel in a car. In 2001, there were 1183 motor vehicle deaths involving drivers or passengers in Australia, but no deaths from spider bites."

Various models to explain spider phobia are detailed: the 'non-associative' model, where fear is not based on previous negative experience, but rather on an innate Darwinian concern that spiders are venomous; another model suggests that spider phobia depends on conditioning, modelling, and negative information experiences; the 'disgust sensitivity' theory proposes that people who are scared of spiders also have a fear of other animals that evoke disgust such as slugs and maggots; this final theory provides some explanation for the association of spiders with disease.

There are many misconceptions surrounding spiders and disease-from them being the alleged causes of the great plagues to the cause of skin ulcers. Dr Isbister comments: "The current myth asserts that many types of spider are responsible for necrotic ulcers. This is a perception of both patien

Contact: Geoffrey K Isbister

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