U.S. health officials halt publication of a study on Covid-19 vaccine effectiveness in preventing hospitalizations, citing a dispute over the study's methodology.

US health authorities plan to bar lawful permanent residents from reentering if they've traveled to Ebola-affected areas, per new rule published Friday

U.S. health authorities announced plans to bar lawful permanent residents from reentering the country if they have recently traveled to Ebola-affected areas, according to a new rule published Friday.

US temporarily bans green-card holders who visited DRC, Uganda, or South Sudan in last 21 days to prevent Ebola entry.

The US government has temporarily banned entry of green-card holders who traveled to the Democratic Republic of Congo, Uganda, or South Sudan in the past 21 days, aiming to prevent Ebola from entering the country.

Natural food dyes linked to higher Type 2 diabetes and cancer risk, new study finds. Research suggests alternatives to artificial colors may pose health concerns.

New research indicates that natural color additives, often used as alternatives to artificial food dyes, are associated with increased risks of Type 2 diabetes and cancer.

Warsh elected chair of U.S. Federal Reserve's rate-setting committee

Warsh elected chair of U.S. Fed's rate-setting committee