http://www.iht.com/a...ence/snpara.php
"On paper, Toxoplasma gondii looks as if it ought to be the most famous parasite on Earth. This single-celled pathogen infects more than half the world's population.
Each of Toxoplasma's victims carries thousands of the parasites, many residing in the brain. And Toxoplasma is equally adept at infecting all other warm-blooded animals."
"Once you get infected with Toxoplasma, you're infected for life"
"Once Toxoplasma enters a host, it spreads quickly. Within hours it can be detected in the heart and other organs. It is even able to infect the brain, which is protected from most pathogens by a tight barrier."