This study is bullshit. I know one of the authors, Jaroslav Flegr. He's a local lolcow who has spent the entire coof panic proclaiming himself High Prophet and predicting fire and brimstone unless everyone listens to him... by writing long letters addressed to his goddamn cat and publishing them on social media. The man is actually, legitimately fucking insane, and the "study" is the result of polls he ran on his goddamn facebook profile. I'm not making any of this up, I swear - I'm not high enough to think of something this dumb. It's a high school tier science project.

Here he is on Family Guy, btw. Even before the coof he was so crazy he made it on the show: https://www.youtube.com/watch?v=QBRT4aLh1nI (He didn't discover toxoplasmosis, he just wrote about it a bunch because he loves his cats so much.)

Also fun fact: one of his older works, IIRC from the 90s or early 2000s, is literally a defense of Lysenkoism.