I wouldn't say the staff (as in, doctors and nurses) are careless. It's just that in many hospitals the state hasn't been paying for cleaning services.

There have been multiple instances of rats being found in hospitals, for example.

Here's a source from a few months back. This one was in the pediatric ICU!

http://rederecord.r7.com/video/rato-e-encontrado-em-uti-do-h...