I have an acquaintance who works at a school where there was a suspected case of swine flu and they had to sterilize all the surfaces in the school, including the computers in the computer lab. What would sterilize a computer in such a situation without damaging it? Would simple alcohol wipes suffice? These would be standard desktop machines with a mix of CRT and LCD monitors.
An oldie from Slashdot: Disinfection Technology/Methods for Computer Equipment?
You can buy wipes specially designed for cleaning LCD screens. I'm not sure if they would steralize to medical standards, though. This comment suggests diluted alcohol is an option.
For keyboards, if they're "normal" keyboards, you can usually pull the keys off and run them through the wash. Just remember what goes where :-) (and make sure you can reassemble them before you pull them all apart -- some of the bigger keys are more fiddly)