Figure 2.

Mink farmworker coronavirus disease 2019 surveillance virologic testing results, January 14 to October 31, 2021

^a The number of weekly samples exceeds the number of mink farmworkers as sampling was increased to twice or three times weekly after detection of a case on some farms; the number of workers per farm varies significantly depending on the mink farm production cycle phase. As of October 31, 2021, 11 cases of coronavirus disease 2019 infection in mink farmworkers were detected through the human surveillance program (10 positive via saline gargle and 1 indeterminate on gargle subsequently positive on follow-up nasopharyngeal [NP] swab) out of 5,673 tests among 123 unique workers since January 14, 2021

^b One individual who returned an indeterminate result during epiweek 13 was positive on follow-up NP swab