According to the CDC, the flu vaccine reduces the odds of getting the flu by 70% to 90%.
You may wonder why there's such a wide range. And in fact, it's even wider than it seems: that statistic only applies to healthy adults. It turns out that the effectiveness of the flu vaccine depends on a number of different factors. Here's a rundown of what they are.
The flu vaccine doesn't work equally well in all people. It’s most effective in healthy adults. In young children,...