White-tailed spider bites--arachnophobic fallout?

To investigate if public concern regarding the toxic effects of the bites from white-tailed spiders, Lampona cylindrata and L. murina, is reflected in the case histories of patients admitted to Christchurch Hospital with a diagnosis of spider bite.

The case histories of patients admitted to Christchurch Hospital with a diagnosis of 'contact with venomous spiders' were examined for evidence that the patients developed necrotising arachnidism.

Ten patients were admitted to Christchurch Hospital between January 2001 and January 2003 with a diagnosis of 'contact with venomous spiders'. We found no evidence that patients developed necrotising arachnidism. No patients admitted to Christchurch Hospital required re-admission to treat sequelae of the putative spider bite. Support for a spider bite as the causative agent was not robust and alternative agents could have been the cause.

The public's fear of bites from white-tailed spiders is likely misplaced and, if the spider was not caught in the act of biting the patient, alternative diagnoses should be considered before assuming a white-tailed spider was responsible for the patient's symptoms.