After months of decline, cases of Covid-19 infection are once again rising around the country. But data shows that the biggest increases are in states that are lagging behind in vaccinations. Nationwide, the four-week Covid case count has more than doubled as of Monday from the previous four weeks, according to NBC News’ tally. While cases are rising everywhere because of higher transmission levels of the delta variant, the steepest increases have been in the South and Southeast, where Florida, Tennessee, Louisiana, Mississippi and South Carolina are dealing with the biggest outbreaks in the nation. To read the full story.