Places of residence of participants with antibody levels suggesting prior exposure to Toxocara spp. Tc-CTL-1 (n = 172) (A) and Strongyloides stercoralis Ss-NIE-1 (n = 4) (B) , Mississippi, USA. All serologic assays were performed using MAGPIX multiplex recombinant antigen beads (ThermoFisher, https://www.thermofisher.com) on convenience serum samples collected at the University of Mississippi Medical Center (Jackson, MS, USA) during October 28, 2017–March 29, 2018. Only those samples confirmed by a subsequent S. stercoralis crude L3 larval antigen (CrAg) ELISA are included.