Richard Knox

Scientists believe a little girl born with HIV has been cured of the infection.

She's the first child and only the second person in the world known to have been cured since the virus touched off a global pandemic nearly 32 years ago.

Doctors aren't releasing the child's name, but we know she was born in Mississippi and is now 2 1/2 years old — and healthy. Scientists presented details of the case Sunday at a scientific conference in Atlanta.

Researchers say more young American women are being diagnosed with advanced breast cancer.

It's a newly recognized trend. The numbers are small, but it's been going on for a generation. And the trend has accelerated in recent years.

There's still more to learn about the risks of smoking and the benefits of quitting.

Studies in this week's New England Journal of Medicine show that the risk for women has been under-appreciated for decades. New data also quantify the surprising payoffs of smoking cessation — especially under the age of 40.

A smoldering epidemic already affects an estimated 4 million Americans, most of whom don't know it.

It's hepatitis C, an insidious virus that can hide in the body for two or three decades without causing symptoms — and then wreak havoc with the liver, scarring it so extensively that it can fail. Half of all people waiting for liver transplants have hepatitis C.