FIG. 1.

TIA of sera from Paraguayan aborigines. Assayed serum samples were from persons negative for T. cruzi infection by conventional serological and parasitological tests. The value of 0% was assigned to the inhibition obtained with pooled serum samples from areas of nonendemicity. The positions of the dot spots of recombinant antigens 1, 2, 30, and SAPA and of the glutathione S-transferase (GST) from Schistosoma japonicum, expressed by the pGEX vector without insert (Pharmacia, Uppsala, Sweden) and used as a negative control, are indicated in the top box. Open circles denote the samples giving positive dot spot reactions. The results from two positive and two negative sera in the dot spot assay are also shown.