The potential reason might be this charming fellow

https://en.wikipedia.org/wiki/Toxoplasma_gondii

"Once inside our bodies, T. gondii can infiltrate the central nervous system and influence neurotransmitters. The parasite has been linked to personality changes, the emergence of psychotic symptoms, and some neurological disorders, including schizophrenia."

Otherwise the data is not really great so far.

"This kind of research can't show cause and effect, and it often doesn't account for factors that may have affected both the exposure and the outcome.

The researchers also highlight the low quality of a number of the examined studies."