Uh...okay.

You like cats because they're beautiful, elegant creatures, right? Or is it because you've been infected by a parasite that influences your brain?
Bizarrely, new research raises that question, finding that the parasite Toxoplasma gondii, which lives in cats, actually makes cats attractive rather than scary to their natural prey (in this case, rats). Earlier research also suggests that this parasite, which can infect humans, may affect personality and possibly even the risk of schizophrenia.
Read more: http://healthland.time.com/2011/08/1...#ixzz1VPftCeSI
"That's one butt-wiggle for a cat... and one giant pounce for catkind..."
A parasite wants to live, hence moving to different hosts to complete its life cycle and produce offspring. The rabies virus is a seek and destroy kind of deal, if an animal (cat, bat, cow, human) is infected, fatality is 100% guaranteed.Originally Posted by Tom
"That's one butt-wiggle for a cat... and one giant pounce for catkind..."
Actually, I read this some time ago. The toxoplasma parasite must complete its life cycle in a cat, but the early part of its life cycle is spent in a rodent. The parasite does that to the rodents it infects to increase the odds it will find its next host (a cat)... or more accurately, that its next host will find it.
I suppose the rabies virus does sort of the same thing, infecting an animal and causing him/her to get violently aggressive, biting other creatures.