WebMD - yeah right. A real plethora of info backed up by facts from the NIH.
If I were willing to accept the data...then my first reaction would be why? Logic would dictate that it is not merely having a close pet...which a dog would easily accomplish in this logic. The cat has to have some type of bacteria....that would be helping your body in some fashion. So...as the cat owner quietly sleeps at night...that dang cat is licking your face...transmitting lots of friendly bacteria into you...thus saving your life in the end. Logically...this is the only way that this would work.