I reblogged a comic the other day about a doctor watching House, MD and diagnosing toxoplasmosis, tagging it with "you're more likely to get toxoplasmosis from a salad than a cat". There's a story behind that.
I used to work in the kennel at a vet clinic. One day one of the vet techs came into the kennel in a tearing hurry, handed me two cat carriers, and said, "Find a cage for these two. Don't know how long, but you can put them together." And then she left.
This was not how that was supposed to happen. I had no cage cards--no names, no feeding instructions, no health information--they weren't on the schedule, and techs didn't usually intake boarders. Medical cases had a separate kennel, so a tech shouldn't be bringing me an animal in during office visit hours. But I had a cage in the cat room, so I tucked them in--two adult females, very friendly, apparently healthy.
Half an hour later the tech came back--with cage cards--and said, "It's okay, they're staying overnight and going home tomorrow." She slumped against the kennel wall and told the cats' story.
They had been brought to the clinic to be euthanized, to die.
These healthy, friendly, beloved cats had been brought in to be killed, because a woman's doctor, her obstetrician, had told her that they had killed her unborn baby. He told her if she ever wanted a child she had to get rid of the cats. He told her they should be euthanized before they killed any other woman's unborn child.
He said, with no evidence, that they had toxoplasmosis. He said that toxoplasmosis caused her miscarriage.
The woman was distraught. She had just lost her baby, she was dealing with the hormonal changes of the pregnancy loss, and now she had to euthanize her beloved cats. Fortunately no vet I've ever worked for will euthanize healthy animals brought in by a sobbing client without asking why!
The vet spent almost an hour talking to the woman, educating her on toxoplasmosis, telling her all the reasons her doctor was wrong.
Not all cats have toxoplasmosis, and even when they do they only shed the oocytes in their feces--they're only infectious--for the first few weeks. Most cats are infected as kittens and are no longer infectious as adults. According to Wikipedia, "Numerous studies have shown living in a household with a cat is not a significant risk factor for T. gondii infection,[61][63][64] though living with several kittens has some significance.[65]"
Most people get toxoplasmosis from raw vegetables, especially salad greens that grow close to the soil and are hard to clean. Raw or rare meat, raw seafood, and unpasteurized milk are also a risk.
Toxoplasmosis can be a soil-borne disease from feces in the soil. Gardening is a greater risk than cat cohabitation.
Toxoplasmosis infection is dangerous to the fetus in pregnancy, yes, causing birth defects and miscarriages. But only the first time the person is infected. If this this woman had lost her first pregnancy to toxoplasmosis--and the vet said it really didn't fit the symptoms--she would be at low risk in a subsequent pregnancy.
So basically the vet told the woman that 1) her miscarriage probably wasn't toxoplasmosis, 2) even if it was, she probably didn't get it from her cats, 3) even if her cats had given her toxoplasmosis, they weren't infectious anymore.
The woman kept her cats and got a new obstetrician.
Human doctors get a few lectures on zoonotic diseases--diseases transmitted from animals to humans or vice versa. Veterinarians get semesters. If a doctor ever tells you your animals have given you a disease, get a second opinion from your vet!
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