New Covid-19 cases in the United States have been trending down since hitting a peak last week, but experts say it's too soon to be overly optimistic. The US recorded 1.5 million new Covid-19 cases in the past seven days, according to the most recent data from Johns Hopkins University -- an 11% drop from the previous week. Cases declined in 35 states week-over-week, and 18 states saw a drop in the number of deaths.