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Infections with C. difficile are a big problem for people in hospitals and nursing homes. An experimental treatment with spores from a harmless version of the bacterium prevented new infections.

Effectiveness of the vaccine within one year of the final booster was 73 percent. But it fell to 34 percent in two to four years, an analysis of a Washington state epidemic found.

Loretta Lynch also met with police, local officials, members of Congress and community groups.

On May 9 — 42 days after the last reported case — the World Health Organization will announce that the epidemic has ended in the West African nation. Its citizens are proud, sad and a bit leery.

Afraid of saying the wrong thing to someone with a serious illness? Now there are "empathy cards" that make fun of those well-meaning but tasteless remarks.

Companies are assembling and churning out tailored stretches of DNA faster and more cheaply than ever before. The tool speeds research into diseases of plants and people. But what about eugenics?

An officer's body camera captured his decision not to shoot a possibly armed suspect. He was praised for brave self-restraint, but some law enforcement officers say his reluctance was irresponsible.

Omar Khadr, who served more than a decade at Guantanamo Bay, has been released on bail while he waits out an appeal for war crimes' convictions. The Canadian government criticized the judge's ruling.

The lofty target for the superPAC of not-quite-a-candidate Jeb Bush is one more sign of the cash gusher — and legal gray areas — opened up by recent campaign finance decisions.

Don't look at me! In Minnesota, lawmakers are banned from making eye contact during debate. The idea is it leads to more civility. But does it? And what can animal science teach us about it?