Richard Knox

Most researchers currently believe that United Nations peacekeeping soldiers introduced cholera to Haiti in October of 2010.

After all, Haiti hadn't recorded cholera for as long as a century, Nepal had experienced a cholera epidemic in the months preceding the soldiers' arrival, and the Haitian and Nepalese cholera strains were found to be nearly identical.

Top AIDS scientists are scratching their heads about new data from the most famous HIV patient in the world — at least to people in the AIDS community.

Timothy Ray Brown, known as the Berlin patient, is thought to be the first patient ever to be cured of HIV infection.

China's first national survey of tuberculosis has produced some of the worst TB news in years.

Out of the million Chinese who develop TB every year, researchers say at least 110,000 get a form that's resistant to the mainstay drugs isoniazid and rifampin. Patients with such multidrug-resistant or MDR tuberculosis have to be treated for up to two years with expensive second-line drugs that are toxic and less effective.

In our recent poll on what it means to be sick in America, one ethnic group stands out as having special problems – Hispanic Americans.

The national survey, conducted by NPR with the Robert Wood Johnson Foundation and the Harvard School of Public Health, sheds new light on Hispanics' health issues. It runs counter to the widespread impression that African-Americans are worst-off when it comes to the cost and quality of health care.

A shortage of Adderall began last year, sending millions of people with attention deficit/hyperactivity disorder and narcolepsy on perpetual wild goose chases to find drugstores with the pills they need to stay alert and focused.

So it's not surprising that Adderall counterfeiters have seized a big marketing opportunity. What is surprising is their clumsiness.

Millions of men and their doctors are trying to understand a federal task force's recommendation against routine use of a prostate cancer test called the PSA.

The guidance, which came out last week, raises basic questions about how to interpret medical evidence. And what role expert panels should play in how doctors practice.

A big study of a colon cancer test called flexible sigmoidoscopy may provide a good example of how a cheaper, easier-on-the-patient and possibly better technology isn't always the one American doctors choose to use.

There they go again — those 17 federally appointed experts at the U.S. Preventive Services Task Force are telling American doctors and patients to stop routinely doing lifesaving tests.

A federal task force has concluded that men over 50 don't need a regular blood test for prostate cancer. Millions of men get the test every year. The task force says too many unnecessary treatments are being performed because of the test.

In the lull between the Supreme Court arguments over the federal health overhaul law and the decision expected in June, we thought we'd ask Americans who actually use the health system quite a bit how they view the quality of care and its cost.

Most surveys don't break it down this way.

When the results came back, we found that people who have a serious medical condition or who've been in the hospital in the past year tended to have more concerns about costs and quality than people who aren't sick. No big surprise there.

U.S. government spending to fight HIV/AIDS in developing countries is also preventing death from other diseases, a new study finds.

Some experts worry the billions of dollars the United States spends to treat people with HIV in poor countries may crowd out prevention and treatment of other illnesses.

Millions of people around the world are living with HIV, thanks to drug regimens that suppress the virus. Now there's a new push to eliminate HIV from patients' bodies altogether. That would be a true cure.

We're not there yet. But a report in Science Translational Medicine is an encouraging signpost that scientists may be headed in the right direction.

Here's good news for geezers — or for merely middle-aged folks — who'd like to stay fit and independent far into their later years.

You don't have to lift heavy weights to build muscle strength. Lifting lighter weights can be just as effective if you do it right, and you're much less likely to hurt yourself, researchers say.

Nine national medical groups are launching a campaign called Choosing Wisely to get U.S. doctors to back off on 45 diagnostic tests, procedures and treatments that often may do patients no good.

Many involve imaging tests such as CT scans, MRIs and X-rays. Stop doing them, the groups say, for most cases of back pain, or on patients who come into the emergency room with a headache or after a fainting spell, or just because somebody's about to undergo surgery.