TABLE 3.

Details of sample collection for different assay applications^a

Variant mutation	Frequency of sampling	n	Previously published?	No. of days RNA stored at −80°C for samples newly processed as part of this study
Mu	Biweekly: 1/21/21–3/30/21 Weekly: 4/1/21–5/25/21 3 per wk: 5/26/21–11/15/21	90	No	4–300
Beta/Gamma	One sample from 2/23/21 Weekly: 4/17/21–7/26/21	16	No	0–2
Delta	Biweekly to weekly: 2/7/21–5/1/21 3 per wk: 5/1/21–9/3/21 Daily: 9/4/21–11/30/21 3 per wk: 12/3/21–1/3/22	156	Partially, n = 48 collected between 2/7/21 and 7/30/21 (19)	0–30
Alpha	Monthly: 7/14/20–3/25/21 Daily: 3/28/21–8/8/21	133	Yes (19)	NA
Lambda	Weekly for 2 wks: 11/1/21 and 11/8/21	2	No	0–2
Omicron	Weekly: 11/2/21–11/23/21 3 per wk: 11/29/21–12/5/21 Daily: 12/6/21 and 1/2/22	35	No	0–30

^aDetails include frequency of sample collection for different assay applications, number of samples included in this study, whether any of the data have been published, and the time range that RNA samples were stored between extraction of RNA and running the PCR assays. RNA extraction occurred on the day of sample collection, as explained in Materials and Methods. Dates are reported as month/day/year.