Here are a couple of sites that talk about that kind of infection.

http://www.phageinternational.com/pathogens/proteus.htm

http://emedicine.medscape.com/article/226434-overview

Looks like the short line is it's an intestinal bacteria and can cause UTI's and other things in that vein. It's commonly found in long-term care facilities and hospitals and from patients with underlying diseases or compromised immune systems. Considered a community acquired infection.