Two choices? Really?
Here's the thing; the late
George Carlin preformed a skit where he talked about how everything today is soooo antiseptic. Antibacterial soaps, antibiotics, alcohol rubs, etc etc! We're so clean in killing all the germs that we're letting our bodies get weak to illnesses. The immune system needs some exposure to keep strong, up to date, etc.

That was his skit. Something about swimming the Hudson River (basicly raw sewage) when he was young too.
I don't
totally agree, but he does have a point.

I'm clean, but not so clean that I eliminate every germ in a 10 mile radius. Before I started school, I worked out a ton too. My immune system was hell on wheels while I was working out. I eat right, (until recently) worked out, and I fear not light exposure. I have a strong immune system.
I was surrounded by flu (H1N1 perhaps?) carriers at one time a week and a half ago. I survived just fine.