I never ride when I'm sick. I am a pathetic wuss and the world comes to a standstill whenever I start to feel poorly. I drag myself home and go to bed, and start demanding cups of tea. Luckily for my dh I'm rarely sick for long 
Honestly, if I'm sick I always get worse if I try to exert myself.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett