In humans, particularly infants
and those with weakened immunity,
T. gondii infection is generally
asymptomatic but may lead to
a serious case of toxoplasmosis.
T. gondii can initially cause mild,
flu-like symptoms in the first few
weeks following exposure, but
otherwise, healthy human adults
are asymptomatic.
This asymptomatic state of infection
is referred to as a latent infection,
and it has been associated with
numerous subtle behavioral,
psychiatric, and personality
alterations in humans.
Behavioral changes observed
between infected and non-infected
humans include a decreased aversion
to cat urine (but with divergent
trajectories by gender) and an
increased risk of schizophrenia.
Preliminary evidence has suggested
that T. gondii infection may induce
some of the same alterations in
the human brain as those observed
in rodents. Many of these
associations have been strongly
debated and newer studies have
found them to be weak, concluding:
On the whole, there was little
evidence that T. gondii was related
to increased risk of psychiatric
disorder, poor impulse control,
personality aberrations, or
neurocognitive impairment.
T. gondii is one of the most
common parasites in developed
countries; serological studies
estimate that up to 50% of the
global population has been exposed
to, and may be chronically infected
with, T. gondii; although infection
rates differ significantly from country
to country.[14][26] Estimates have
shown the highest IgG seroprevalence
to be in Ethiopia, at 64.2%, as of 2018.
https://en.m.wikipedia.org/wiki/Toxoplasma_gondiiF