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Mind-Altering Cat Parasite Linked To Schizophrenia in Largest Study Yet (sciencealert.com)

Scientists claim they have found new evidence of a link between infection with the protozoan parasite, Toxoplasma gondii, and schizophrenia, in what is described as the largest study of its kind. From a report: T. gondii, a brain-dwelling parasite estimated to be hosted by at least 2 billion people around the world, doesn't create symptoms in most people who become infected -- but acute cases of toxoplasmosis can be dangerous. Healthy adults are generally thought to not be at risk from T. gondii infections, but children or people with suppressed immune systems can develop severe flu-like symptoms, in addition to blurred vision and brain inflammation.

Pregnant women need to be careful too, as the parasite can cause foetal abnormalities or even miscarriage. Aside from the known physiological dangers, however, the stranger and more ambiguous risks associated with the parasite remain largely hypothetical -- although a huge body of research suggests something weird is going on. Causation remains very much disputable, but the brain-dwelling parasite -- commonly carried by cats and present in their faeces -- has been linked to a huge host of behaviour-altering effects.

Virtually all warm-blooded animals are capable of being infected, and when T. gondii gets inside them, unusual things happen. In rodents, animals seemingly lose their inhibitions, becoming more exploratory and losing their aversion to cat odours.

20 of 116 comments (clear)

  1. If this explains why I smooch cats... by jlowery · · Score: 3, Funny

    ...then I'm no longer filled with self-loathing.

    --
    If you post it, they will read.
  2. Basically... by slipped_bit · · Score: 3, Funny

    ... this explains why cats are taking over teh world.

    1. Re:Basically... by slipped_bit · · Score: 2

      And I, for one, welcome our new feline overlords!

  3. Yet another reason.... by cayenne8 · · Score: 2, Insightful

    ....to own a dog instead of a cat.

    --
    Light travels faster than sound. This is why some people appear bright until you hear them speak.........
    1. Re:Yet another reason.... by dunkelfalke · · Score: 4, Informative

      While the cats are the primary host for toxoplasmosis, the main source of transmission in your country is raw meat and unwashed fruits and vegetables.

      --
      "It's such a fine line between stupid and clever" -- David St. Hubbins, Spinal Tap
    2. Re:Yet another reason.... by Oswald+McWeany · · Score: 4, Insightful

      ....to own a dog instead of a cat.

      I don't get the "either/or" argument. Both cats and dogs make great pets- too many people seem to think that there needs to be a competition that you have to dislike one if you like the other.

      They fill different voids. IN GENERAL: Dogs are more like kids, they are dependents and look for you for direction. Cats are more like fellow adults/buddies, they're more independent but still enjoy your company but they have a life outside of you.

      Why not both: a dog to look after and take for walks, and a cat to curl up on your lap as you read a book at night?

      --
      "That's the way to do it" - Punch
    3. Re:Yet another reason.... by Nidi62 · · Score: 3, Insightful

      IN GENERAL: Dogs are more like kids, they are dependents and look for you for direction. Cats are more like fellow adults/buddies, they're more independent but still enjoy your company but they have a life outside of you.

      With a cat I have an arrangement of "here, you eat your food and shit in the litterbox. You have your life and I have mine. If you want to cuddle on the couch, that's cool".

      Try getting a wife instead. You eventually end up with basically the same arrangement, but there's also the occasional opportunity for sex.

      --
      The only thing necessary for evil to triumph is for it to be pitted against a slightly greater evil
    4. Re:Yet another reason.... by Nidi62 · · Score: 5, Funny

      Dogs give you unconditional love...not sure what you get out of a cat.

      Apparently schizophrenia.

      --
      The only thing necessary for evil to triumph is for it to be pitted against a slightly greater evil
    5. Re:Yet another reason.... by burtosis · · Score: 2

      Instructions unclear... asked the wife to shit in the litter box and now not only is there no sex, I'm sleeping in the doghouse.

  4. Explains the crazy cat lady phenomena by Stonent1 · · Score: 3, Interesting

    So the lady on the Simpsons that throws cats at people was just schizo from cat parasites.

    1. Re:Explains the crazy cat lady phenomena by ConceptJunkie · · Score: 3, Insightful

      Or it's just a joke.

      --
      You are in a maze of twisty little passages, all alike.
  5. Really? by vbdasc · · Score: 5, Interesting

    IMHO, if T.gondii is hosted by 2 billion people worldwide, then it's rather a human parasite than a "cat parasite".

    1. Re:Really? by bill_mcgonigle · · Score: 2

      The cat is the carrier and beneficiary. Humans and rodents are the hosts and victims.

      A hundred years from now, after we have effective treatments, people will look back at this as a major health crisis that was barely understood.

      --
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    2. Re:Really? by HiThere · · Score: 2

      No. It would be fair to call it a mouse parasite, because the mouse is a part of the natural life cycle, but instances of T.gondii that end up infecting people are dead ended (unless the person is eaten by a leopard or some other cat). So while lots of humans are infected, and their behavior probably altered, it only indirectly affects any T.gondii, and doesn't benefit those that are infecting the person.

      T.gondii needs to be eaten by some kind of cat or other to complete its life cycle. (So calling is a mouse parasite, while reasonable, is less valid than calling it a cat parasite.)

      --

      I think we've pushed this "anyone can grow up to be president" thing too far.
  6. Re:I wonder by Pinky's+Brain · · Score: 4, Informative

    It's permanent, some treatments can help against latent cases but they only use it for AIDS patients.

  7. Re:This shouldn't be too much of a problem.. by Major+Blud · · Score: 2

    After all, how many mind-altering cats are there, really?

    Just one. https://en.wikipedia.org/wiki/...

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  8. Crazy Cat Ladies by sycodon · · Score: 2

    It explains the Crazy Cat Ladies.

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    When Fascism comes to America, it will call itself Anti-Fascism, and tell you to give up your guns.
    1. Re:Crazy Cat Ladies by jellomizer · · Score: 2

      Maybe a little.
      Someone who has immune system problem is sick a lot, so would probably like to have a cat as company.
      Such cat may have the parasite, and then the person get schizophrenia and inhibits a lot of the "Crazy" like symptoms.

      --
      If something is so important that you feel the need to post it on the internet... It probably isn't that important.
  9. We've talked about this before by Trailer+Trash · · Score: 4, Informative

    Toxoplasmosis has a life cycle that includes cats and their prey. It reproduces inside the cat's digestive system and comes out in their crap. Since cats don't eat crap and generally stay away from crap, it has found a clever way to get back into a cat's digestive system. It infects cats' prey, such as rodents, and makes them far less afraid of cats and cat odors. Which makes them far more likely to be eaten by cats. The parasite apparently has no effect on cats, but it has psychoactive effects on the other hosts.

    Since it's psychoactive, it's not surprising that it has such effects on humans.

    This is similar to the rabies virus, which causes dogs to bite anything and everything (the virus is present in saliva) and actually has the same effect on humans. In humans, the end result is hallucinations, confusion, and aggression - probably what dogs are going through before they die of rabies.

  10. Too bad there's no cure by Harvey+Manfrenjenson · · Score: 3, Informative

    The active infection is fairly easy to treat, but there is no known way yet to eradicate the latent, encysted infection.

    Psychiatric researchers have known about this problem for a while, and they've even done a few controlled trials to see if schizophrenics etc. improve when given anti-toxoplasma agents. The trials were all failures. As more than one reviewer has pointed out, the failures were not surprising, because the anti-toxo agents are known to be ineffective against latent infection.