Memorial Day weekend at Robert Moses State Park on Fire Island, N.Y. As the pandemic continues, Harvard’s Dr. Ashish Jha says, mask wearing, social distancing and robust strategies of testing and contact tracing will be even more important.

Memorial Day weekend at Robert Moses State Park on Fire Island, N.Y. As the pandemic continues, Harvard’s Dr. Ashish Jha says, mask wearing, social distancing and robust strategies of testing and contact tracing will be even more important.