Sheila
There is something called MRSA. It stands for Methicillin-resistant Staphylococcus aureus. It is a mutation of a very common bacterium that is spread easily by direct person-to-person contact. There are many risk factors involved. It has become prevalent due to the overuse of antibiotics. These people are usually placed in isolation. I don't know if this is what you are talking about as I have never heard of a urinary disease called mersa. I would need more information to help you correctly.