Rae Ellen Bichell

Flint, Mich., brought the risk of lead pipes to many people's attention, but the problems go further. Find out if lead pipes could be affecting your drinking water.

Two women woke up to find they were blind in one eye. Then their eyesight quickly returned to normal. The likely cause? They had been gazing at their smartphone screens in the dark.

Citing growing evidence that no amount of lead exposure is safe for kids, the American Academy of Pediatrics has called for tighter regulations on the amount of lead in house dust, water and soil.

Syphilis cases are on the rise. The bacterium that causes the sexually transmitted disease is becoming resistant to some antibiotics. But somehow, penicillin has remained the best weapon against it.

People are supposed to get vaccine boosters for tetanus and diphtheria once every 10 years. But researchers in Oregon say that's overkill: For adults, one booster every 30 years might be good enough.

The medication is the only one available to prevent an infected pregnant woman from passing the disease to a fetus. Pfizer says the shortage should be over in July.

The message about reducing the risk from the Aedes aegypti mosquito is the same today as it was 70 years ago. This time there's just a new virus involved.

Guillain-Barre syndrome can render healthy people temporarily paralyzed. It's something you're likely to hear more about as Zika continues to spread. And for those who get it, it is one wild ride.

One man died and five others were injured in a clinical trial in France this year. Trials like those depend on healthy people willing to take experimental medications in return for cash.

In January, one man died and four others sustained brain injuries in the early clinical test of an experimental pain drug. Independent scientists reviewed the study to learn what went wrong.

After a decline throughout the '90s, suicide rates have reversed course. Suicide has increased in almost every age group over the past 15 years.

A Texas man who had traveled to Venezuela passed the Zika virus to his male partner through sex. CDC officials say that people should be aware that Zika can be transmitted through semen.

U.S. health officials say they are now convinced that Zika virus can target the developing brain before birth, leading to a severe type of microcephaly and other brain abnormalities.

The Obama administration requested $1.9 billion in emergency funds to prepare for Zika, but Congress has yet to respond. Now the White House plans to divert funding intended for Ebola.

The organ donor and both recipients in the procedure this month were all HIV-positive — a first in the U.S. Using HIV-positive organs for some patients could enable a thousand more transplants a year.

Evidence has ping-ponged over the decades on the effects of hormone therapy on a woman's arteries. The latest study suggests a brief stint on hormones might be helpful — if given at the right time.

In engineering the cell, researchers paired away nearly all genes that weren't essential to life. It might eventually serve as a basic framework for different sorts of cellular factories, they say.

Every year, little clusters of Nipah virus break out in Bangladesh. And it wasn't from the usual cause — drinking raw sap from date palm trees. So what's up?

Quitting abruptly is more effective, a study finds, even for people who'd rather phase it out gradually.

Getting an accurate diagnosis is a big hurdle in the current outbreak of Zika virus. There are three kinds of tests for Zika, and each has problems. Scientists are working hard to improve diagnosis.