Yes, even if meat is properly cooked, once it reaches the intestines, since it takes longer time to digest and gets putrid, it encourages the development of parasites like ring worm, tape worm etc, which otherwise would be killed in a vegetarian food handling intestines.
Yes.. I experienced this, but when I stop eating any kind of meat, these parasites disappeared in full and I have a healthy digestive track.. I even consume less food because now I am not sharing my food with those multi legged brothers!
I feel more energetic and younger when I started becoming pure vegetarian. It is proved scientifically in the following site:

http://www.veggie123.com/veggie/chapter6...