Proteus mirabilis is a type of bacteria commonly found in the intestines of humans and animals. It is known for its ability to cause urinary tract infections (UTIs) and is often associated with complicated cases due to its resistance to certain antibiotics. This bacterium can also produce enzymes that break down urea, leading to the formation of kidney stones. In addition to its role in infections, Proteus mirabilis is notable for its unique swarming motility on solid surfaces. This characteristic allows it to spread rapidly, forming a distinctive pattern. Understanding this bacterium is important for developing effective treatments for infections it may cause.