The real threat from rats doesn't come from their bite ... they, like most animals, will avoid humans if possible. The real threat comes from the diseases they carry, which get transmitted to humans by the flees.
1 year ago
Last edited at 11:30AM on 2/3/2012
Walt is on the right path, but the virus' and diseases rodents carry are also in their feces, saliva, and bodies when they die.
Their rapid breeding can lead to infestations which can virtually guarantee the spread of virus' and diseases which are deadly to human physiology.
I'm under the impression that you're asking more about their disposition though. Rodents are quite smart, and are able to be taught, and studied because of this. For many years neuro-psychologist have taken advantage of various smart mammals in order to better understand how the human mind evolved.
They are not "committed", but predisposed to nibble where we might not want. Keep them away from babies, keep them indoors, keep their living spaces clean, and you should be able to enjoy them as any other pet.
Its actually a myth that the plague that killed hundreds of thousands came from rats. It actually came from the fleas that were infesting the rats. Rats do not go out and look to bite humans. Although not my favorite, they are extremely intelligent and are very social. Bites by rats, unless provoked, are rare. So your answer is no.