Thirty-four out of 50 states have seen cases increase for at least two weeks in a row, up from 29 the prior week. They include Pennsylvania, Ohio, Michigan and North Carolina — all battleground states for the Nov. 3 U.S. presidential election. In Nevada and South Dakota, more than 35% of tests came back positive for COVID-19 last week, the highest in the country, according to data from The COVID Tracking Project, a volunteer-run effort to track the outbreak. A total of 14 states have a positive test rate of over 10%.