https://en.wikipedia.org/wiki/Toxoplasmosis
Up to half of the world's population is infected with toxoplasmosis.[8] In the United States about 23% are affected[9] and in some areas of the world this is up to 95%
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The seroprevalence of T. gondii in domestic cats, worldwide, has been estimated to be around 30–40%.[118] In the United States, no official national estimate has been made, but local surveys have shown levels varied between 16% and 80%.[118] A 2012 survey of 445 purebred pet cats and 45 shelter cats in Finland found an overall seroprevalence of 48.4%.[119] A 2010 survey of feral cats from Giza, Egypt, found an overall seroprevalence of 97.4%.[120]