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[Preliminary results of the use of an ELISA test for the differential determination of IgG and specific IgM in toxoplasmosis serology].

The diagnosis of acute toxoplasmosis usually depends on serology, since clinical and/or histological features are difficult and/or often misleading. IgM titers are the best indicators of infection acquired in the past two to four months. IgG titers are generally correlated with non-active infections as well as previous (symptomatic and/or asymptomatic) illness. In the present paper, results obtained with a new kit for the evaluation of IgG and specific-IgM by micro-ELISA technique, are reported. Optical density values in sera from: a) blood donors; b) miscellany group; c) suspected toxoplasmosis, were at various degree high for IgG. Few sera of the entire sample (in the group of suspected toxoplasmosis and one in miscellany) showed high optical density for specific IgM. Reading of results with spectrophotometer were in agreement with reading to the naked eye. Reproducibility was satisfactory. Unfortunately some sera positive in the first determinations gave equivocal results in successive proofs. For these reasons diagnosis of toxoplasmosis must be based upon the use of at least three tests.