A few years ago I felt like an alarmist when, over at Killer Hobbies, I asked whether a cat parasite might be capable of altering human behavior.
I’d just discovered that the Toxoplasma parasite changes the behavior of infected rats. Cats are the natural hosts for the Toxoplasma parasite, which gets very crafty in its attempts to reach a feline. Research shows that when a rat is infected with Toxoplasma, its brain is altered so that the rodent loses its fear of cats. The infected rat becomes much more likely to get eaten by a cat, and then—voila!—the parasite reaches its target host.
Other research indicates that even human behavior can be affected by parasites.
A parasitologist (who knew such a field existed?) reports that women who are infected with Toxoplasma tend to be more extroverted and caring—to what end as far as the parasite is concerned, is not known. My personal theory is that perhaps the parasite is trying to make us take better care of its feline hosts. I come from a family of dedicated cat lovers. As a clan, we like dogs just fine. But we’re nuts about cats. For example, I have an aunt who owns nine indoor kitties. She also feeds and takes care of dozens of feral cats.
My sister is another fierce protector of all things feline. She has appointed me executor of her estate on behalf of her two cats. I have precise instructions for where and how they’ll be cared for if they outlive her (her will even includes funding for a long-term kitty haven).
Then there’s me. My husband calls me a “cat whisperer.” When I see or hear a cat on the street, I’m magnetically drawn to it. I’m strangely drawn to it, I’m thinking now.
Our familial tendency to adore cats and care for them makes me wonder—could it be that we’re all infected with the Toxoplasma parasite, and we’ve been passing the bug down through the generations? Maybe the parasite has altered our brains to make sure that we take excellent care of its host, Mr. Cat.
Bottom line: Is a bug pulling our strings?
Technically speaking, I’m not even sure that a parasite is a bug (science teachers, help me out here). But I’m sure it looks like one under a microscope. I’ll bet it looks really disgusting, too.
The whole thing makes me think about some signs my relatives have hanging all around their houses. The signs say things like:
“The cat owns the house. We just work here.”
Things may be worse than they know.
We might all be working for a damned bug.
Update:
Now I feel vindicated for having sounded the alarm about parasites affecting humans. Radiolab weighed in recently with an entire show on the subject. Think about it next time you’re communing with Kitty!






