My 3.5 year old DD is currently down with the dreaded sickness bug, the last two times she's had one I've also come down with it a day or 2 later. But I know a good few parents who never catch it, their kid has 24 hours of sickness and then they just stay healthy. Even my mum never caught mine as a kid and I once threw up on her face.
I'm always diligent with hand washing and Dettol spraying, this time even more so as I'm 35 weeks pregnant and feeling drained enough as it is! We've also been so far pretty lucky and always contained it in a bowl so I'm not (touch wood) so far scrubbing floors or dealing with multiple sicky sheets and towels in the wash.
How do some parents avoid it?!