The updated rules apply to inbound travelers from the U.S. who have received non-inactivated vaccines made by Pfizer, Moderna, and Johnson & Johnson

Key things to know as mass vaccinations against Covid-19 pick up steam around the world in humanity’s best hope for corralling a pandemic

Short seller alleged Genscript selectively released data and cast doubts on its capabilities

Health care giant invests in its largest overseas market as sector booms

China still uses old-generation therapies that have harsh side effects, including headaches, hair loss