The country recorded an average of 52,875 new cases every day over the last seven days, down 19% from an average of 65,285 new cases per day on July 28, according to a CNBC analysis of data compiled by Johns Hopkins University.
The decline in testing is particularly acute in some of the hardest hit states with the worst outbreaks, which further skews the overall case numbers across the U.S.
In Texas, for instance, new cases have fallen by 10% to an average of 7,381 a day from 8,203 two weeks ago, based on a seven-day moving average.
Testing, however, is down by 53% over the same time frame.
Meanwhile, the percent of positive tests has doubled over the last two weeks to about 24%, according to Johns Hopkins University.