jsidhu762: I'm more concerned about the diseases and parasites than I am with the actual animal.
Rat droppings can carry some nasty diseases, so remember to clean up, especially if you have foodstuff. It's not THAT dangerous (I've been told that I have more chance to get contaminated during a simple walk in the local forest), but it never does harm to be careful
Oh, and handle the critter with care : The little guys are fighters when they feel they can't escape. Smart, brave, aggressive, good swimmers and jumpers... Many of my colleagues have an healthy respect of cornered rats defending their nests.
(I'm a sewer worker, and my yearly vaccine shot is planned for tomorrow, so it feels weirdly appropriate to be asked about them today. With my line of work, I should despise or hate the lil' buggers, but I think I kinda admire, or even like, them. Especially since one of them seem to have taken a liking to our teams, and follows us during our underground inspections in his part of the network ^^)