Percent of persons testing positive, and percent of tests that are positive are helpful indicators in understanding the spread of infection in a community. Percent of persons testing positive indicate one result reported for each individual tested (positive or negative), even if that person is tested more than once with the same result. As a result, it often reflects higher positivity rates.

Percent of tests that are positive indicates the total number of specimens tested, including when an individual is tested more than once, and reflects higher reported test numbers and lower positivity rates. It is also more widely used by other states and the Federal government, and is therefore useful to compare Delaware to other jurisdictions.

Because of the increasing frequency of repeat testing, using person-based percent positives could be misleading on a daily basis. Therefore, using the percent of tests that are positive is a more useful measure to make operational decisions. Data for percent of tests that are positive are based on the testing date, while data for persons testing positive is based on the date results are reported to DPH. There is a two-day lag for presenting data related to percent of tests that are positive to account for the time delay between the date of the test and the date that DPH receives the test result.

Latest Status

Test Rates by Zip Code and Week

Testing Totals in New Castle County

New Castle County
419,074 75,350.7 per 100,000 people

Total Persons Tested in Comparable Location

New Castle County
1,095,776 197,023.5 per 100,000 people

Total Tests in Comparable Location

Demographics

New Castle County

Data are current as of 6pm the previous day. Last update: 05/13/2021

Total Persons Tested by Race/Ethnicity

Total Persons Tested by Race/Ethnicity & County

Race/Ethnicity New Castle State of Delaware Kent Sussex
Non-Hispanic White 189,022 345,699 47,445 92,762
Non-Hispanic Black 90,251 138,444 24,728 15,942
Hispanic/Latino 41,530 63,938 6,194 13,817
Another/Multiple 38,822 62,267 6,581 12,402
Asian/Pacific Islander 15,779 19,195 1,698 1,242
Unknown 43,670 77,926 13,263 17,905
New Castle County

Data are current as of 6pm the previous day. Last update: 05/13/2021

Rate of Persons Tested by Race/Ethnicity

Rate of Persons Tested by Race/Ethnicity & County

Race/Ethnicity New Castle State of Delaware Kent Sussex
Hispanic/Latino 7,509.7 7,235.8 4,961.2 6,714.8
Non-Hispanic Black 6,448.3 6,521.1 5,443.8 5,922.4
Non-Hispanic White 5,292.0 5,251.9 4,056.7 5,038.7
Asian/Pacific Islander 5,108.8 5,111.7 4,647.0 4,124.9

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