i think a little sickness is a good thing. we need to be able to live with these viruses and build some immunity against them...kinda evolve together. there's a reason why the native americans were hit hard when the europeans came over. maybe the future is eliminating most viruses and updating your body's vaccine software every fall, but until then the occasional test for your immune system isn't a bad thing.
it's like the people who bathe in antibacterial everything. bacteria doesn't have to be a bad thing. we need good bacteria to thrive.