Table 1.

Contrasting, on the one hand, the SARS-CoV-2 variant exposure status as defined based on time periods with known variant circulation with, on the other hand, the SARS-CoV-2 variant exposure status as defined through linkage with Whole Genome Sequencing (WGS) and presumptive genotyping results in the COVID-19 TestResult database

	Delta based on time perioda	Omicron based on time periodb
Conf. or comp. Deltac	272 (12.0%)	1 (0.0%)
Conf. or comp. Omicronc	8 (0.4%)	249 (11.5%)
Other variant	1 (0.0%)	1 (0.0%)
Unknown	1983 (87.6%)	1919 (88.4%)
Total	2264	2170

^a30th of August–14th of November 2021

^b31st of January–28th of March 2022

^cConf. = confirmed through WGS. Comp. = compatible, based on presumptive genotyping