s among the general population, so the risk of contact with cats appears to be minimal. Medical experts do, however, urge some caution when cleaning out a litter box, as Toxoplasma is readily transmitted to humans through the accidental ingestion of cat feces. (As if such an unsavory fate weren't bad enough!)
But if people aren't typically contracting Toxoplasma from contact with cats, how are they getting it? The biggest culprit is the eating of undercooked meat. As we've seen, Toxoplasma can lodge itself in the muscle tissue (i.e., meat) of any warm-blooded animal, including pigs, cattle, sheep, and chickens. A non-trivial portion of our meat supply is infected. Luckily, heating tainted meat to at least 155 degrees Fahrenheit (67 degrees C) for a few minutes appears to be sufficient to prevent infection. Obviously, to be completely safe, you might want to consider going even hotter and longer . . .
1) Just as Toxoplasma reduces reaction times in rodents - presumably, to make them easier for cats to catch - it also makes people react more slowly. In fact, infected individuals are at much higher risk of experiencing an automobile accident. (And remember, most people who have contracted Toxoplasma are completely oblivious to the fact.)
2) Women infected with Toxoplasma experience a suite of changes that might be considered generally positive. They tend to be very kindly, and to exhibit, on average, slightly higher IQ, conscientiousness, warmth, generosity, and guilt-proneness. Why in the world would the parasite engender these particular effects? Well, anything Toxoplasma can do to aid and abet its genetic kin will be subject to evolutionary selection pressure, since this will still effectively help pass along its genes. Thus, Toxoplasma appears to be trying to turn its female hosts into people who will be particularly nice to cats - aka, "cat ladies!"
3) Men, on the other hand, have a completely different set of reactions to Toxoplasma infection. They experience reduced IQ and initiative, and tend to become more stoic, laid-back, and slow-tempered. In other words, they become just the sort of guys who would be unlikely to interfere with their "cat lady" wives, to hinder them from tending to their brood of adoring felines!
Now, having outlined this array of creepy Toxoplasma effects, I need to give the following disclaimer: these effects on personality are often fairly subtle, and many infected individuals exhibit no measurable effects at all.
Nevertheless, the obvious question for each of us is: what if I'm infected, and if so, what can be done about it? I am duty-bound to urge you to consult with your physician on this one. Certainly, there are fairly straightforward blood tests that can determine whether or not you have Toxoplasma antibodies in your system (which would in turn indicate whether or not you've ever had an active infection, in which case it's likely that you would still have Toxoplasma cysts in muscle and nervous tissue).
There are a number of different antibiotics that seem to have at least some effect in combating the Toxoplasma cysts in the brain, although at this point it's premature to say that any single drug (or combination) is a guaranteed cure. Given the enormous potential public health implications of this issue - which is just now coming to widespread attention - I think it's safe to say that finding a reliable way to eradicate Toxoplasma will become a high clinical research priority in the years ahead.