Abstract
The presence and specificity of IgG antibodies produced by patients with loxoscelism were studied. The loxoscelism diagnosis was supported mainly by clinical parameters. A search for IgG antibodies anti- Loxosceles gaucho venom in patients with loxoscelism submitted to serumtherapy showed antibodies in four out of 20 patients. The IgG antibodies were detected as early as 9 days and as late as 120 days after bite. The highest IgG antibody titer was 1:640 and the lowest was 1:80. Immunoblotting tests showed that human anti- L. gaucho IgG antibodies recognize preferentially the components responsible for the dermonecrotic and lethal activities of the venom. A comparison of the clinical picture, the level of serum IgG antibodies and the dose of antivenom administered suggest that there is no relationship between these parameters.
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