CDC puts it at over 40 million in the USA, so over 10%. https://www.cdc.gov/parasites/toxoplasmosis/index.html https://www.cdc.gov/parasites/toxoplasmosis/index

CDC puts it at over 40 million in the USA, so over 10%. https://www.cdc.gov/parasites/toxoplasmosis/index.html https://www.cdc.gov/parasites/toxoplasmosis/index.html Edit: here's that paper from Tenter et al. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109627/#__ffn_sectitle https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109627/#__ffn_... As a consequence, no two tests produce the same results in all cases, even when carried out in the same laboratory [45–54]. In addition, prevalence rates vary over time and with the age of the individuals included in the study [55–68]. The strongest thing they were willing to say is that it's higher in Latin America and west Africa, and lower in colder climates. Here's a direct link to Table 3 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109627/table/T3/?report=objectonly https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3109627/table/T...