Strange story here, I don't know how true this is but it may be worth some research ladies.
http://www.medicaldaily.com/news/201207 ... on-cdc.htm
http://www.redorbit.com/news/health/111 ... -in-women/
http://www.nzherald.co.nz/world/news/ar ... d=10817539
"There has to be an invisible sun."
I heard something similar a while ago. I don't think it was litter specific, but that most people who have cats, also have a certain parasite living in their brain.