Alabama had the biggest weekly increase at 28%, Missouri’s new cases rose 27% and North Carolina’s rose 26%, according to the analysis of data from The COVID Tracking Project, a volunteer-run effort to track the outbreak.

New cases in Georgia, one of the first states to reopen, rose 21% after two weeks of declines. The state attributed the increase to a backlog of test results and more testing.

Nationally, new cases of COVID-19 fell 0.8% for the week ended May 24, compared with a decline of 8% in the prior week. All 50 states have now at least partially reopened, raising fears among some health officials of a second wave of outbreaks. The increase in cases could also be due to more testing.