From your 'tips on colds'
Wear gloves in public and on public transport. Don't use money - use your cards. And if you smell nitrous oxide on anyone's breath, hold you own breath and turn away to breathe - their nose is making this gas to kill bugs they already have and they are infectious. Nitrous oxide smells 'cold' and metallic. Zazen (tip 1) (who will forevermore be known by MNHQ as Jack Bauer)
I'm sure Zazen is as lovely as me, but that's cold.