TABLE 1.
Characteristics of donor specimens tested (March 2020–August 2021)
| Specimen details | Level | Study quarter n (%) |
Total | |||||
|---|---|---|---|---|---|---|---|---|
| March 12, 2020–May 30, 2020 | June 1, 2020–August 30, 2020 | September 1, 2020–November 30, 2020 | December 1, 2020–February 28, 2021 | March 1, 2021–May 30, 2021 | June 1, 2021–August 31, 2021 | |||
| Specimen type | Lower respiratory | 180 (11.5) | 638 (13.9) | 819 (13.3) | 742 (11.1) | 1908 (22.7) | 2617 (32.1) | 6904 (19.4) |
| Upper respiratory | 1304 (83.4) | 3786 (82.6) | 5241 (84.9) | 5740 (85.8) | 6193 (73.8) | 5280 (64.8) | 27 544 (77.5) | |
| Other | 79 (5.1) | 162 (3.5) | 114 (1.9) | 205 (3.1) | 291 (3.5) | 248 (3.1) | 1099 (3.1) | |
| Test method | Nucleic acid (PCR) | 1480 (94.7) | 4349 (94.8) | 5905 (95.6) | 6268 (93.7) | 7893 (94.1) | 7748 (95.1) | 33 643 (94.6) |
| Othera | 83 (5.3) | 237 (5.2) | 269 (4.4) | 419 (6.3) | 499 (6.0) | 397 (4.9) | 1904 (5.4) | |
| SARS-CoV-2 status | Negative | b (99.5) | 4573 (99.7) | 6154 (99.7) | 6627 (99.1) | 8252 (98.3) | 7962 (97.8) | 35 124 (98.8) |
| Positive | b (0.5) | 13 (0.3) | 20 (0.3) | 60 (0.9) | 140 (1.7) | 183 (2.2) | 423 (1.2) | |
| Total | 1563 | 4586 | 6174 | 6687 | 8392 | 8145 | 35 547 | |
Abbreviations: PCR, polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
a
Other includes antibody, antigen, and “other” methods.
b
Data includes cell counts <10, excluded from reporting specific value for privacy issues.