Not buying it, otherwise it would rival the bubonic plague, and it doesn't.  When I can have pregnant women, chemo patients and people with AIDS feeding cat colonies over a number of years and have zero problem when according to you they all should be long dead, it makes me think you're concerns are overblown at best.  The amount of exposure, the degree of illness caused if any, and the multiple ways it can be spread around, makes your arguments not hold very much water in my view.  Sorry.