TABLE 1.
Sampling rates by sampling period and age group, COVID‐NET, a March 2020 to June 2021
| Sampling period | 18–49 years | 50–64 years | 65+ years | |||
|---|---|---|---|---|---|---|
| Total cases | Sampling rate b for all sites (range) | Total cases | Sampling rate b for all sites (range) | Total cases | Sampling rate b for all sites (range) | |
| March–May 2020 | 7390 | 44% (10% to 100%) | 8459 | 13% (10% to 20%) | 12,867 | 10% (10% to 10%) |
| June–September 2020 c | 10,136 | 20% (5% to 40%) | 8413 | 12% (5% to 20%) | 11,109 | 8% (5% to 10%) |
| October 2020 | 2532 | 11% (4% to 69%) | 2677 | 12% (3% to 93%) | 4373 | 7% (3% to 38%) |
| November 2020 | 4965 | 10% (10% to 10%) | 5918 | 10% (10% to 10%) | 11,294 | 5% (3% to 5%) |
| December 2020 | 5778 | 5% (3% to 5%) | 7125 | 4% (3% to 5%) | 14,615 | 2% (1% to 3%) |
| January 2021 | 5227 | 6% (3% to 10%) | 6441 | 6% (3% to 10%) | 12,429 | 3% (1% to 5%) |
| February 2021 | 2760 | 12% (7% to 50%) | 3030 | 11% (7% to 50%) | 5183 | 7% (3% to 50%) |
| March 2021 | 3057 | 12% (5% to 50%) | 3302 | 11% (3% to 50%) | 3749 | 8% (3% to 50%) |
| April 2021 | 4697 | 7% (2% to 70%) | 4362 | 8% (2% to 70%) | 3961 | 9% (2% to 70%) |
| May 2021 | 2868 | 17% (7% to 100%) | 2270 | 17% (10% to 100%) | 2249 | 19% (10% to 100%) |
| June 2021 | 1178 | 31% (25% to 100%) | 785 | 44% (35% to 100%) | 850 | 46% (35% to 100%) |
a
COVID‐NET includes 14 US states (CA, CO, CT, IA, GA, MD, MI, MN, NM, NY, OH, OR, TN, and UT).
b
Actual sampling rates may have deviated slightly due to random number selection.
c
All sites sampled persons aged 18–29 years at 100% except CA, GA, and MD who sampled at a rate of 10%.