Cat Parasite Linked to Increased Suicide Risk in Women
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This news won't be good for cat ladies everywhere. According to NPR, a recent study found that a parasite carried by house cats can lead to an increased suicide risk in women.
The parasite is called Toxoplasma gondii and lives in the intestines of your feline friends. Humans can become infected with T. gondii from changing the litter boxes, but we also can pick up the microscopic pest from uncooked vegetables and meat.
In a study of 45,000 Danish women, results showed that those infected with T. gondii were 1.5 times more likely to take their own lives. While the differences may seem small, University of Maryland psychiatrist Teodor Postolache said that it's large enough to mean there is a connection. The feline parasite has also been linked to several other behavioral problems, including schizophrenia and bipolar disorder.
RELATED: Learn What's Behind Your Cat's Weird Behavior
Dr. Postolache told NPR that animal lovers should not give away their felines because of this study. The actual risk of a suicide attempt as a result of this parasite is very small. Less than 1,000 of the study's participants (about two percent) experienced self-directed violence in the 30-year span of the study, with seven ultimately committing suicide.
Scientists are still unsure how T. gondii affects the brain and causes these behavioral changes. In rats, the parasite encourages cysts to form on areas of the brain linked to behavior. Strangely enough, infected rats also lost their fear of cats and became attracted to the scent of cat urine.
RELATED: Get Expert Advice on Cat Behavior
While the results of the study may be somewhat alarming, cat lovers can rest assured that when it comes to owning felines, the benefits certainly outweigh the risks.
Find Out What Human Foods Your Feline Can Share:

The parasite is called Toxoplasma gondii and lives in the intestines of your feline friends. Humans can become infected with T. gondii from changing the litter boxes, but we also can pick up the microscopic pest from uncooked vegetables and meat.
In a study of 45,000 Danish women, results showed that those infected with T. gondii were 1.5 times more likely to take their own lives. While the differences may seem small, University of Maryland psychiatrist Teodor Postolache said that it's large enough to mean there is a connection. The feline parasite has also been linked to several other behavioral problems, including schizophrenia and bipolar disorder.
RELATED: Learn What's Behind Your Cat's Weird Behavior
Dr. Postolache told NPR that animal lovers should not give away their felines because of this study. The actual risk of a suicide attempt as a result of this parasite is very small. Less than 1,000 of the study's participants (about two percent) experienced self-directed violence in the 30-year span of the study, with seven ultimately committing suicide.
Scientists are still unsure how T. gondii affects the brain and causes these behavioral changes. In rats, the parasite encourages cysts to form on areas of the brain linked to behavior. Strangely enough, infected rats also lost their fear of cats and became attracted to the scent of cat urine.
RELATED: Get Expert Advice on Cat Behavior
While the results of the study may be somewhat alarming, cat lovers can rest assured that when it comes to owning felines, the benefits certainly outweigh the risks.
Find Out What Human Foods Your Feline Can Share:
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The following quote is taken from a message board on composting human manure. People were concerned about litter boxes and separately composting cat manure and its pathogenic substances. The person quoted below has some interesting information about not becoming infected with "tomoplasmosis", the disease which is transmitted by the micro organism "toxoplasma gondii".
July 06 2012 at 7:58 AM Report abuse Permalink rate up rate down Replytaken from message boards at:
http://www.jenkinspublishing.com/cgi-bin/messages/show.cgi?tpc=4&post=2728#POST2728
This message is about half way down the page in its contextual position...
(BEGIN QUOTE) For what it's worth, the disease most people worry about being transmitted in cat litter is tomoplasmosis, from the micro organism toxoplasma gondii. High temps in the compost pile WILL kill it, but more importantly, it is well nigh impossible to really have a problem with it. However, under some conditions, toxoplasmosis can cause serious pathology, including hepatitis, pneumonia, blindness, and severe neurological disorders. This is especially true in individuals whose immune systems are compromised (e.g., AIDS patients). Toxoplasmosis can also be transmitted transplacentally resulting in a spontaneous abortion, a still born, or a child that is severely handicapped mentally and/or physically.
The reason it is not very likely to be a problem from cat litter is manifold.
First, the cat can only transmit the organism in its feces for a short time (at most a few weeks) after its initial infection. After that time, the parasite enters to host tissue and is not shed in feces.
Second, The organism is only transmissible to fetuses during a rather narrow window during gestation, and then, only if the infection is new.
Third, the organism is transmitted by prey animals, and so only if your cat has eaten one will it have the parasite, so few indoor only cats will have it.
Fourth, the parasite IS highly infectious, so if you have a cat, and you clean its litter box with anything short of a biosuit, you have already been exposed to the organism, and have built up immunity to future infection.
Thus the likelihood of Tpg transmission to fetuses, or to the adult is VERY small, and then only in a very circumscribed set of circumstances. You need to have just gotten the cat, and it needs to have been your first outdoor cat, AND it needs to have just gotten infected, AND you need to have gotten pregnant at just the wrong time, AND cleaned the litter box in such a way as to contact the organism, AND gotten infected.
In fact, a recent study of the organism looked at factors involved in the transmission of the organism, and found at the top of the list contact with infected food. Not only was cat ownership not at the top of the list of risk factors, it was not at the bottom either. In fact, they found no evidence that contact with cat feces presented a significant risk AT ALL. (END QUOTE)
Technically that sounds fine and dandy from what you stated. However 30 years ago I live next door to a 32 year old woman, her husband and 3 sons (good friends). They had a cat and the woman developed a serious infection in her eye; it caused her to go blind in that one eye. Then the pain became so painful in that eye, she said she contemplated suicide several times, so the doctor removed the eye and she said the caused the pain to go away. Point is, the infection was caused but something having to do with the cat [probably while cleaning the litter box] but that sweet cat caused the woman's life to become a living hell. No, she did not keep the cat.
August 11 2012 at 9:54 PM Report abuse Permalink rate up rate down ReplyCorrection:
August 11 2012 at 10:00 PM Report abuse Permalink rate up rate down ReplyTechnically that sounds fine and dandy from what you stated. However 30 years ago I lived next door to a 32 year old woman, her husband and 3 sons (good friends). They had a cat and the woman developed a serious infection in her eye; it caused her to go blind in that one eye. Then the pain became so painful in that eye, she said she contemplated suicide several times, so the doctor removed the eye and she said that caused the pain to go away. Point is, the infection was caused but something having to do with the cat [probably while cleaning the litter box] but that sweet cat caused the woman's life to become a living hell. She ended up getting a prosthetic replacement eye. No she did not keep the cat.
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July 05 2012 at 6:25 AM Report abuse Permalink rate up rate down ReplyI think it's because cats have ESP and practice mind control. If the cat doesn't like its owner it uses the "Think System" and makes the person wanna kill themselves. Makes as much sense as this article.
I have had this diagnosed and its cure is simple...Just a 2 week dose of Clindamycine. Once cured the parasite is gone and unless you introduce it again it will be safe.(there is NO way to be immune)The thing is cross contamination is possible . I bet they will find that any and all parasites have a reaction on everything (pertaining to Suicide study). The worst thing is to let an animal suffer with undiagnosed parasites leaching nutrition from their bodies. Please note there are only certain ways to check for this and other less heard of parasites. You need to have a PCR done of the stool. That will tell you genetically what bug your dealing with. People need to also realize in office stool samples are worthless and misdiagnose or miss shedding couple protozoans and the PCR panel is now state of the art technology. I dont know why we just done eradicate these things we can so we dont have to worry about people getting them and causing harm. But think about it..if it causes harm to us..is it safe to let them go unchecked in our beloved animal friends??????? just sayin
July 04 2012 at 6:56 AM Report abuse Permalink rate up rate down ReplyI hate these kind of articles...imagine all the cats that are going to be dumped because of this...people can be so stupid...
July 04 2012 at 6:30 AM Report abuse Permalink rate up rate down ReplyI think that is rude to say about cats i have had cats and dogs all my life so has my sister even when she was pregnant we had 2 cats, and litter its the smell of the stuff in litter that is bad for pregnant women and anyone can ask a doctor a human doctor about it, and for the parasites i have more luck getting a parasite from a bathroom at a store or the movies even camping, and yes it is try that some cats love baby's milk on their mouth but that is not all cats some wont even go near a new born baby some are too scared of the baby moving, when my sisters children were baby's are cats would not go near them , and rat thing it is the truth that some of the bigger rats can fight cats but they can hold there own if the cat love the people in the home the cat will fight its hardest just like a dog and cats are smart sometimes to smart just like dogs and if i sound rude sorry it is just that people say mean things about cats and dogs and gets me mad the animal places are haven a hard time placeing cats and some dogs in home because of what people say about them and the truth is is that cats are cuddle and love there owners as long as they get treated right and the same with dogs
July 04 2012 at 1:40 AM Report abuse Permalink +1 rate up rate down ReplyThis article was written by a PO'd Wiener dog.... Captain HuggyFace.... A Snooty Feline Hater....
July 04 2012 at 1:04 AM Report abuse Permalink rate up rate down Replyif you've already had it then you are immune. So if you already have outdoor cats that eat raw meat then you are already immune and it doesn't matter if you clean the litter box or not. you can get tested for the antibodies but an indoor cat eating dry cat food won't get it
July 04 2012 at 12:18 AM Report abuse Permalink rate up rate down Replyyeah it is stupid, Do the research before making a comment. We have 2 cats and just had a baby and yes don't change the litter box but a person has a much higher chance catching this parasite from meat that's not fully cooked. FACT. 70 percent of the people in england have been infected with this parasite in there life time... Many facts not listed here, its just going to equal more homeless animals due to ignorance. More Chicken little the sky is falling crap. Sad, Sad ,Sad.
July 03 2012 at 11:43 PM Report abuse Permalink +2 rate up rate down ReplyIt's not stupid.... The parasites are real. This is also why pregnant women should never change the litter box. It can be transferred to the fetus. ~~~~ Just don't choose to have a cat if you are going to have babies.
July 03 2012 at 10:59 PM Report abuse Permalink rate up rate down ReplyThey come up with the strangest garbage, I thing the parasite is the person that cam up with this
July 03 2012 at 10:34 PM Report abuse Permalink rate up rate down Reply