As the virus that causes COVID-19 continues to evolve, the tools used to keep us safe are evolving too. Learn more about the new bivalent boosters.

Last March, just as the pandemic was ramping up in Massachusetts, Louisa dialed 9-1-1. Her husband Michael was suffering from an acute infection and needed urgent medical attention.

Trick-or-treating isn't worth the risk during COVID-19. An infectious disease expert explains why and shares safer Halloween activities.