Richard Knox

Colorado opened its first pot stores in January, and adults in Washington state will be able to walk into a store and buy marijuana this summer. But this legalization of recreational marijuana is taking place without much information on the possible health effects.

Go into almost any hospital these days and you'll hear a constant stream of beeps and boops. To most people it sounds like medical Muzak.

But to doctors and nurses, it's not just sonic wallpaper. Those incessant beeps contain important coded messages.

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RENEE MONTAGNE, HOST:

Let's hear more now from Americans who are finding that their health insurance has been cancelled - stories that have stirred up more controversy over the Affordable Care Act.

Today marks a milestone on the nation's long march toward universal health coverage: the launch of online marketplaces, called exchanges, designed to help people find insurance they can afford.

It's an idea pioneered by Massachusetts seven years ago. People here call their program a success, and say the state's exchange was an indispensable factor.

A federal task force is planning to recommend that millions of smokers and former smokers get a CT scan annually to look for early signs of lung cancer.

The 16-member US Preventive Services Task Force gives that lung cancer screening test a grade of B, which puts it on the same level as mammography for women between the ages of 50 and 74.

A vaccine against human papillomavirus — the most common sexually transmitted infection and the cause of almost all cervical cancer — is dramatically reducing the prevalence of HPV in teenage girls.

The first vaccine against HPV, Merck's Gardasil, was approved by the Food and Drug Administration in 2006. Cerverix, from GlaxoSmithKline, was approved in 2009.

There's been a buzz of activity at the Centers for Disease Control and Prevention in Atlanta since scientists got their first samples of a new bird flu virus from China four weeks ago.

Already they've prepared "seed strains" of the virus, called H7N9, and distributed them to vaccine manufacturers so the companies can grow them up and make them into experimental flu vaccine.

The number of Boston bombing victims still in the hospital dropped to 19 as of Wednesday evening. The great majority have gone home or to a rehab facility.

That's what has happened with Celeste and Sydney Corcoran, a mother-daughter pair who ended up in the same hospital room after being struck down by the first marathon bomb blast.

Forty-seven-year-old Celeste Corcoran is propped up in her hospital bed. In a nearby window is a forest of blooming white orchids from well-wishers. On the opposite wall, a big banner proclaims "Corcoran Strong."

She's recalling how thrilled she was to be near the finish line of the Boston Marathon, waiting for her sister Carmen Accabo to run by. "I just remember standing there, wanting to be as close as I could to catch her," Corcoran says. "I really just needed to see her face."

The largest current study of an AIDS vaccine, involving 2,500 people, is being stopped.

After an oversight committee took a preliminary peek at the results this past Monday, they concluded there was no way the study would show that the vaccine prevents HIV infection.

Nor would the vaccine suppress the wily virus among people who get infected despite being vaccinated.

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