When Hospitals fail to cope with the number of diagnosed patients, THAT'S when you should start to worry.
But you're talking millions of cases, by which they would probably introduce methods to avoid the above.
PC.
I have it for the PS3 and bought it again on the PC. Better graphics (by a long shot), better controls (mouse to aim ftw), better multiplayer (no crappy PS3 voice comms).
I thought it was really good, very funny, well written and some great lines in it. :)
The first "episode" was a little slow but it really picked up.
"Meeeeeeeeeeaaaoowww Yeeeeeeaah!" :D