Researchers in the United States have shown for the first time they can safely and effectively infect human volunteers with Zika virus, a step toward learning more about the disease and developing vaccines and treatments.   The study – known as a “controlled human infection model” – has previously been …

The World Health Organization warns that tens of thousands of survivors of a series of powerful 6.3 magnitude earthquakes that struck western Afghanistan’s Herat province between October 7 and 15 are in desperate need of humanitarian aid and essential health services. “I have personally seen how these multiple earthquakes flattened …

It’s been a month since a Maryland man became the second person to receive a transplanted heart from a pig — and hospital video released Friday shows he’s working hard to recover. Lawrence Faucette was dying from heart failure and ineligible for a traditional heart transplant because of other health …

Astronomers have detected an intense flash of radio waves coming from what looks like a merger of galaxies dating to about 8 billion years ago — the oldest-known instance of a phenomenon called a fast radio burst that continues to defy explanation.  This burst in less than a millisecond unleashed …

With warmer oceans serving as fuel, Atlantic hurricanes are now more than twice as likely as before to rapidly intensify from wimpy minor hurricanes to powerful and catastrophic, a study said Thursday. Last month Hurricane Lee went from barely a hurricane at 129 kph to the most powerful Category 5 …

Burkina Faso’s health ministry has declared a dengue fever epidemic amid the deadliest outbreak in years. More than 200 people have died, and new cases are rising sharply. There have been 50,478 suspected cases and 214 deaths of the mosquito-borne illness this year, the ministry said in a statement released …

Australian researchers say they have produced the most comprehensive view of the history of the universe to date. An Australian National University team says their study offers new ideas about how the universe might have started. The research team says the study’s aim was to understand the origins of all …

U.N. inspectors took samples from a fish market near the Fukushima nuclear power plant on Thursday following the release of wastewater from the wrecked facility in August. China and Russia have banned Japanese seafood imports since the discharge began but Japan says it is safe, a view backed so far …

As the war drags on, some severely injured Ukrainians who received medical help abroad are returning home. Yana Stepanenko and her mother have resettled in Lviv after a year of treatment and rehabilitation in the U.S. Omelyan Oshchudlyak has the story. Camera: Yuriy  Dankevych       …

A clinical trial is recruiting thousands of volunteers — including a large number of Black women who face disparities in breast cancer death rates — to try to find out. People like Carole Stovall, a psychologist in Washington, D.C., have signed up for the study to help answer the question. …

Four-day work weeks improved Spanish workers’ health several ways, such as by lowering stress while reducing fuel emissions and benefiting children, a pilot program showed on Tuesday.  The coastal city of Valencia — Spain’s third largest with more than 800,000 inhabitants — scheduled local holidays to fall on four consecutive …