The indirect fluorescent antibody test has been used to detect Toxocara antibodies quantitatively in human sera. The results obtained correlate well with those obtained with the toxocara skin test. Cross reactions have been found with Ascaris lumbricoides and about one in five normal sera give a significant fluorescent reaction. The specificity of the test has been established by Ascaris adsorption studies and by a lack of cross reaction with sera from other helminthic infections. The test may be especially easy to use and therefore particularly valuable in regions where A. lumbricoides infection is relatively rare.
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