Coronavirus cases are rising across more than half of the nation even as the outbreak slows across former hotspots in Arizona, Florida, California and Texas. New cases are up by at least 5%, based on a seven-day average, in 26 states as of Sunday, compared with just 12 states a week ago, according to a CNBC analysis of data compiled by Johns Hopkins University. In Arizona, Florida, California and Texas, new cases are declining by at least as much, though those states still accounted for nearly 10,000 new cases combined on Sunday — or about a fourth of all new U.S. cases.