another body bag. reporter: tiffani porter s 3-year-old got severely ill. she s grateful she made it home from the hospital. this virus doesn t care who you are. it doesn t care your age. it doesn t care anything about you. reporter: but new covid cases are now falling in 47 states. hospitalizations down 33% in the last two weeks. governors weighing when to roll back restrictions, pressing the white house for a clear roadmap. what does the road from pandemic to endemic look like? and how do we keep score? reporter: and tonight a new study out of california showing higher quality masks give better protection. researchers found an n95 mask lowered the odd of getting covid by 83% compared to no mask. surgical masks lowered by 66%, and cloth masks by 56%. david, late today the cdc director giving the green light on full approval for the moderna vaccine for everyone 18 and up. it now joins pfizer.