Toxoplasma gondii is one of the fascinating little parasitic creatures capable of changing the natural behavoir of its infected host. It needs to live in a cat in order to reproduce, but the rest of its life cycle can be spent in just about any warm-blooded animal. When it makes its way into a rat or mouse, for example, it has the peculiar ability to render the rodent unafraid of cats and even drawn to their scent. This powerful evolutionary trait increases the T. gondii's chances of reproduction—a mouse hanging around with cats is obviously likely to be eaten.
People should perhaps worry less about the cat poop and more about the other factors that may be involved. T. gondii is widely spread throughout both ocean and terrestrial environments. Many people and many animals have been exposed. Exposure rates over 50% are not uncommon. But a healthy immune system copes with T. gondii very well. While many people and animals have been exposed, few get sick or die. The immune supressed are vulnerable. While T. gondii is a good indicator of the spread of the spread of pathogen pollution, it is not terribly lethal. While the article says many sea otters die, the most recent research says otherwise; like other animals it may be the immune suppressed that are most vulnerable. So the real question is not about T. gondii (like the common cold, it's everywhere). The real question is what is causing immune suppression in our human and wildlife populations? But the answer, in my opinion, is not more research, but is to work towards a clean and healthier ocean and environment.
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