Just fight it :D
I never get sick, because the moment I start feeling sick I fight it as hard as I can... just keep myself as busy as I possibly can and my body will fight through it. if you let yourself get tired and lethargic, it'll get ya!
Oddly enough, I still don't get sick, but I'll end up sleeping like crazy if I'm infected
A crazy flu just ripped through my whole family, I didn't get sick, but now that everyone is feeling better I slept 12 hours a night for the last 4 days, against my will.
but no sick feeling, just a ton of sleep to recover from all the fighting.
I knew I was infected cause all my tattoos were embossed out of my skin, but it didn't get the best of me
