According to the Centers for Disease Control and Prevention, the influenza virus is most commonly active in the United States “from late fall through early spring.”

Since 2010, the CDC has recommended that people over the age of 6 months receive an annual flu shot unless an individual has a specific condition that prevents him or her from receiving the shot.

The CDC recommends getting a flu shot when they first become available in mid-October. However, it is not too late. Getting a vaccine as late as January can still be beneficial, according to the CDC.

Those between 6 months and 8 years old, who require a booster shot after their first shot to be fully covered, should receive their second shot no sooner than four weeks after the first is administered, according to the CDC.

In addition to a flu shot, the CDC recommends avoiding contact with individuals who are sick and advises people to wash theirhands thoroughly and often with soap and water and avoid touching their eyes, mouth and nose.