Table 2. Results of multiplex serologic testing for antibodies suggesting prior exposure to Toxocara spp., Giardia duodenalis, and Cryptosporidium spp. on 1,960 postdiagnostic serum samples from patients at University of Mississippi Medical Center, Jackson, Mississippi, USA*.

Parasite antigen used
Toxocara spp. Tc-CTL-1	S. stercoralis rSs-NIE-1 plus CrAg-ELISA†	G. duodenalis VSP3	C. parvum Cp17	C. parvum Cp23	C. parvum Cp17 + Cp23‡	C. parvum Cp17 + Cp23 and G. duodenalis VSP3
172 (8.8)	4 (0.2)	111 (5.7)	646 (33.0)	1,076 (54.9)	538 (27.4)	38 (1.9)

*All values are no. (%). †8 samples were found to be positive by the rSs-NIE-1 MAGPIX multiplex serologic assay (ThermoFisher, https://www.thermofisher.com), but only 4 reacted in the confirmatory S. stercoralis crude L3 larval antigen (CrAg) ELISA. ‡Only samples reactive to both Cp17 and Cp23 were considered positive for Cryptosporidium spp. exposure.