Guardian: Cat parasite linked to brain cancer
An infectious parasite spread by cats may be a cause of brain cancer in humans, research suggests.
The single-celled organism Toxoplasma gondii infects about a third of the world's population. Often it causes no symptoms, but the parasite can be fatal to unborn babies and damage the nerve systems of people with weak immune systems.
The new study shows a positive correlation between rates of infection by T. gondii and brain cancer incidence around the world.
That's quite enough evidence for me.
Time for a cull!