After months of progress in the fight against Covid-19, cases are rising again as the highly contagious Delta variant spreads across the US. States with below-average vaccination rates have almost triple the rate of new Covid-19 cases compared to states with above-average vaccination rates, according to new data from Johns Hopkins University. As of Sunday, states with lower rates of vaccination reported an average of 6 new cases per 100,000 residents every day over the past week, according to Johns Hopkins.