What happens every year during the winter months is that people are more prone to getting sick with the changes in weather, increase in stress, and other factors. When people are more prone to getting sick, more people will get sick. That's why people get the sniffles, sneezes, and coughs right around the busy holiday season. This doesn't mean that we need to rush off to the nearest pharmacy or grocery store to get the latest flu vaccine. (The fact of the matter is that there are dozens of flu strains out there and the flu vaccine typically vaccinates against 3, so chances are, if you were going to get the flu, you'll probably still get it anyway.) The good news is that your body can fight off the flu better than a vaccine can anyway.
When you are able to de-stress, eat healthy, and practice proper hygiene, you won't need to get the flu vaccine, or any vaccine for that matter. You see, you're body is a pretty smart machine. Your body wants to be healthy and when you give it the natural, correct means, it will tend to stay healthy. So what you can do to help your body fight off the flu or any other microbe, is to eat well, think well, and move well.
These 3 things will keep your body in tip-top microbe fighting shape. If you need more advice on how to do the 3 things, look through the previous bogposts, there's plenty of information there. Also, you innately know how to do all three things, just try listening to your body and being aware of what it's telling you.