One in three people carry Toxoplasma gondii for life, yet most never fall ill. Learn who's actually at risk, how infection spreads.

Around one in three people worldwide have been infected with a microscopic parasite called Toxoplasma gondii, which can cause toxoplasmosis. After the initial infection, toxoplasmosis settles into our muscles and brain, where it can remain for life.
Toxoplasmosis is a good example of a parasite that's simultaneously very common and, for most people, not very dangerous, but the risk is highly dependent on who's infected.

Yet, the vast majority would not even know they are infected, as it rarely poses clinical problems in healthy people who aren’t pregnant. In fact, our bodies do a remarkable job of protecting us against a barrage of infections, without us even knowing, toxoplasmosis included.

So the most concerning question is how this parasite enters the body
Toxo can be carried by cats and transferred to humans through their excrement. The toxoplasmosis parasite can only proliferate in certain "definitive hosts."It does not mean that only Cat owners are affected by this parasite.

Eating undercooked meat that contains toxins is a common cause of infection all over the world. It's also crucial to remember that cats only shed toxoplasmosis during their initial infection; after that, they get immune, which means they stop shedding and spreading the infection. The majority of infected cats do not exhibit any symptoms, but if they do get the clinical condition toxoplasmosis, they may become lethargic, lose their appetite, and have a fever

Many people have heard that this infection is related to pregnant women being advised to avoid undercooked meat and cat litter, as these are two ways we can unintentionally consume toxins. The parasite can pass through the placenta and infect the growing fetus, resulting in miscarriage, blindness, and congenital neurological abnormalities.

Toxo can persist for a lifetime in the host's muscles or brain after infection. However, the only tests available indicate the presence of antibodies rather than the parasite itself; therefore, we are unable to pinpoint its precise location. It's interesting to note that toxoplasmosis can alter a rodent's behavior, including reversing its innate dislike of cat odor, when the rodent's brain is infected.

Scientists have hypothesized that the parasite does this to increase the likelihood that a cat will eat the infected rodent by making it less likely to flee. This completes the intricate life cycle of the parasite, which only reproduces sexually within cats.
For most healthy people, toxoplasmosis remains a silent passenger for life, causing no illness at all. Our health-care system already manages the situations where it poses genuine risks, particularly during pregnancy and in people with weakened immune systems.

But understanding how this remarkably successful parasite hides from our immune system could lead to something we’ve never had before: treatments that completely clear dormant infection.