John Tozzi Bloomberg

The effectiveness of Covid-19 vaccines among front-line workers declined to 66% after the delta variant became dominant, compared with 91% before it arose, according to a report from the U.S. Centers for Disease Control and Prevention.

The world needs the cooperation of the Chinese government to trace the origins of Covid-19 and prevent future pandemic threats, two leading U.S. disease experts said Sunday.

The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive.

The novel coronavirus can spread through the air to people who are more than 6 feet away from an infectious person, the US Centers for Disease Control and Prevention said on Monday, in guidance that could raise new challenges for safely re-opening businesses and schools.

Alexa won't be replacing doctors anytime soon, but Amazon says artificial intelligence can help hospitals become more efficient.

A once rare mosquito-borne virus called Zika is spreading rapidly through the Americas since arriving in Brazil in last May, with a case confirmed in Texas this week in a traveler returning from Latin America. Health officials are alarmed because of a possible link between the virus and a birth defect called microcephaly that causes babies to be bo...

The effectiveness of Covid-19 vaccines among front-line workers declined to 66% after the delta variant became dominant, compared with 91% before it arose, according to a report from the U.S. Centers for Disease Control and Prevention.

The world needs the cooperation of the Chinese government to trace the origins of Covid-19 and prevent future pandemic threats, two leading U.S. disease experts said Sunday.

The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive.

The novel coronavirus can spread through the air to people who are more than 6 feet away from an infectious person, the US Centers for Disease Control and Prevention said on Monday, in guidance that could raise new challenges for safely re-opening businesses and schools.

Alexa won't be replacing doctors anytime soon, but Amazon says artificial intelligence can help hospitals become more efficient.

A once rare mosquito-borne virus called Zika is spreading rapidly through the Americas since arriving in Brazil in last May, with a case confirmed in Texas this week in a traveler returning from Latin America. Health officials are alarmed because of a possible link between the virus and a birth defect called microcephaly that causes babies to be bo...