
US Measles Cases Reach 20-Year High
The number of measles cases in the United States so far this year marks a 20-year high, the Centers for Disease Control and Prevention announced today.
Vaccines help protect people from diseases. They contain "weakened" or "dead" germs, such as viruses or bacteria, which stimulate the body's immune system in a manner that can prevent us from getting sick with harmful pathogens. Here's the latest science news on vaccines.Vaccines
Related Topics: Immune System, Medicine, DNA and Genes, Virus