Why did the man go to see his doctor?

W: Hello, Jim. I haven’t seen you in a while, What seems to be the problem?
M: Actually I’m a little embarrassed about coming here. I feel fine right now. But you know every year around the holidays like clockwork I come down with something.
W: So you’re interested in prevention. What symptoms do you usually get?
M: You know, cough, fever, runny nose, my head and bones ache etc. I usually feel miserably weak and it ends up ruining my holidays.
W: Sounds like a typical flu to me. Influenza often strikes when people are overtired, stressed and not eating nutritious food. And also you increase your exposure to a virus when you’re in big crowds where lots of people are coughing and sneezing.
M: I certainly spend a lot of time in department stores around the holidays buying gifts for people.
W: Yes. And so you increase your exposure to airborne viruses just when your body’s resistance is already low from all the running around you do.
M: So what can I do to ward off the flu?
W: Actually it’s fairly simple. Get a lot of rest and eat well. That way your immune system will be boosted. And you’ll be more able to fight off illness.
M: All these things make sense. But one more question. Aren’t I bound to get sick anyway if there’s an outbreak in the dorm?
W: I’d also suggest you get immunized. It prevents the three main types of influenza.
M: I’ll do it right away. It will be nice to feel well curing the holidays for once.