Fear, fear of lawsuit maybe, they don't know what to do
If they are in immediate danger (such as in middle of highway with cars coming)
All three bacterial species are gram negative. Gram negative bacteria tend to survive better in Internal cavities of the body as they do not have thick cell walls like gram positive bacteria, so tend to "dry out" in dryer conditions like on the skin.
<span>So I would say the urinary tract provides them with a "good" living environment to thrieve and cause infection. They are all opportunistic pathogens. They are also all found naturally in nature in soil and plant roots so maybe this has something to do with it? </span>
A specialization in urology that forces on minimally invasive surgical procedures is called an Endoscopy
