Special Report

Places Where COVID-19 Is Resurging

Methodology:

To determine the counties where COVID-19 is resurging — counties in which the growth in new COVID-19 cases spiked during the summer, returned to normal levels, and spiked again in recent weeks — 24/7 Wall St. compiled COVID-19 cases and deaths data in each U.S. county and county equivalent from state and local health departments. The places on this list are the only counties in the country that meet the following criteria:

The county had a two-week period of growth in average daily new cases per capita that was at least 150% of the national average some time between May 2 and Aug. 29.

The number of average daily new cases per capita in the county from Aug. 30 to Sept. 19 was at least 150% less than the national growth rate.

The county again recently had an above-average number of average daily new cases per capita between Sept. 20 and Oct. 4, the most recent two-week period for which data is available.

To determine the counties where COVID-19 is resurging, 24/7 Wall St. reviewed data on confirmed COVID-19 cases from local and state health departments. Counties were chosen that met the following criteria: the county had a two-week period of growth in average daily new cases per capita that was at least 150% of the national average (at the time) some time between May 2 and Aug. 29; the number of average daily new cases per capita from Aug. 30 to Sept. 19 was at least 150% less than the national growth rate; and the county again recently had an above-average number of average daily new cases per capita between Sept. 20 and Oct. 4, the most recent two-week period for which data is available.

The case growth in the last two weeks must also be greater than or equal to the case growth in the peak two-week identified for the summer months. These criteria are meant to identify counties in which the growth in new COVID-19 cases spiked during the summer, returned to normal levels, and spiked again in recent weeks. Data on population came from the U.S. Census Bureau and are five-year estimates for 2018.