The number of novel coronavirus cases in the US topped 7 million - more than 20% of the world’s total - as Midwest states reported spikes in COVID-19 infections in September, according to a Reuters tally. … All Midwest states except Ohio reported more cases in the past four weeks as compared with the prior four weeks, led by South Dakota and North Dakota. South Dakota had the biggest percentage increase at 166% with 8,129 new cases, while North Dakota’s new cases doubled to 8,752 as compared to 4,243 during the same time in August. Many cases in those two states have been linked to the annual motorcycle rally in Sturgis, South Dakota, that annually attracts hundreds of thousands of visitors.