Randomised controlled trial of intravenous antivenom versus placebo in the treatment of redback spider bite

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Redback spiderbite is the most common significant envenoming in Australia and bites by the closely related widow spiders are a major global problem. Despite widespread use of redback spider antivenom, no controlled study has tested its effectiveness. This study aims to test the efficacy of antivenom versus placebo in a large multicentre, randomised controlled trial - RAVE-II. It is of critical importance to determine if an expensive treatment with a known risk of allergic reactions is effective.