Vaccines can be used to protect against both viruses and bacteria. But bacteria have a secret weapon that makes them harder to fight.

No vaccine is completely effective, so it's helpful to understand how effective different vaccines are when people decide whether to get vaccinated. Until now, there has been little information about the flu vaccine's effectiveness for children.

Most of the press around the start of flu season focuses on high-risk groups, such as children, the elderly, pregnant women and those working in healthcare. But others are at risk too.

The flu vaccine is not perfect, but it has been shown to reduce a person's risk of getting the flu. For children in particular, this can mean avoiding the hospital.

Doctors recommend annual flu shots to help patients stay healthy during flu season. New research suggests that the flu vaccine also might help prevent stroke.

Tuberculosis is not a common disease in the US, but it does occur, even among children. So, who are those children?

Receiving quality prenatal care means ensuring that you protect both yourself and your unborn child from disease. One recommendation for this is getting the flu vaccine.

Vaccinations are given to protect children from common ailments. A new study found that the risk of fever may increase when two of these vaccines are administered at the same time.

A universal flu vaccine to protect against all strains of the flu doesn't exist yet. But a new one does appear to protect against four flu strains at once.

Antibiotics completely revolutionized the way medicine is practiced. But they brought a downside too — when bacteria learned to fight back.