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Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. The best way to prevent flu is by getting a flu vaccine each year.

About influenza prevention for travelers - CDC

Fact sheet provides an overview about the impact of flu on pregnant women, and emphasizes the importance of flu vaccination for pregnant women and their unborn babies - CDC

Seasonal Flu Vaccine Safety and Pregnant Women - CDC

CDC Centers for Disease Control and Prevention Influenza Flu - findings from the Internet Panel Survey of pregnant women flu vaccination in the United States for the 2010-11, 2011-12, and 2012-13 flu seasons.

Answers to common questions about flu vaccine effectiveness for the 2013-14 season - CDC

CDC public health news, press releases, government public health news, medical and disease news, story ideas, photos.

Some people are at high risk for serious flu complications, including young children, older people, pregnant women and people with certain health conditions. Flu vaccination and the correct use of flu antiviral medicines are very important for those people.

Influenza (flu) is an infection of the nose, throat and lungs caused by the influenza viruses. It can cause mild to severe illness, and at times can lead to death. Children younger than 5, but especially children younger than 2 years old, and children and adolescents with chronic health conditions are at greater risk for serious flu complications.

Selected Publications on Influenza Vaccine Effectiveness - CDC