Some of the worst infections come from cat scratches. The term "Cat Scratch Fever" has a real meaning behind it. Ages ago when people were scratched by cats they would often get a fever and become VERY sick. Many died from the infections of a simple cat scratch.

Now, as for urine being sterile, that is entirely true. However, urine is the body's waste being removed from the body. That in itself should tell you it's nothing you want to ingest, either intentionally or by mistake. I will say the analogy given in this thread did a great job at appetite supression for me. Definitely not a vision I needed to picture.