Our immune systems constantly fight off disease — protecting us from colds, flu and infection. An experimental treatment called immunotherapy is helping patients' immune systems fight off cancer.

A map from the World Health Organization reveals show something interesting: Many poor countries have higher vaccination rates than rich ones.

Because the Chicago-area patients are all under a year old, they can't be vaccinated. Saying that more cases are likely, a Cook County health official warns, "The cat is out of the bag."

Indianapolis-based Anthem, the country's second-biggest health insurer, says hackers obtained personal information such as names, birthdates and social security numbers of policyholders. No credit card data was compromised.

Scientists launched a large trial Monday to test two vaccines. But testing Ebola drugs in West Africa is proving more difficult than expected because the disease is disappearing rapidly.

Indiana's high vaccination rate keeps chances of outbreak low, say public health experts.

Several times a week, Mike Quaglia dons bright red boxing gloves and pummels a hundred-pound punching bag. He has Parkinson's disease, and the boxing helps alleviate his symptoms.

With Super Bowl XLIX just around the corner, "Frontline" is asking fans for their thoughts on the NFL's concussion problem.

Shares of Anthem competitors UnitedHealth Group Inc. and Aetna Inc. also rose about 30 percent or more last year.

A single X-ray or CT scan exposes a person to just a tiny bit of radiation, but over time, that exposure can add up to increased rates of cancer — especially for kids. Now, patients at Riley Hospital for Children in Indianapolis have a new option.