You know the signs. The thunderous cough. The pounding headache. The full-body fatigue.

It's the flu. Last fall and winter, influenza sickened roughly 40 million Americans and killed 60,000, according to the Centers for Disease Control and Prevention.

This year's flu season is nearly upon us. Here are four tips to stay healthy.

1. An ounce of prevention is worth a pound of cure. People should get the flu vaccine early. Every year, this shot prevents up to 6.7 million flu cases, 87,000 hospitalizations, and 10,000 deaths. The vaccine also helps makes the flu less severe for those who do catc...