Brown KA, Gubbay J, Hopkins J, Patel S, et al. S-Gene Target Failure as a Marker of Variant B.1.1.7 Among SARS-CoV-2 Isolates in the Greater Toronto Area, December 2020 to March 2021. JAMA 2021 Apr 8. pii: 2778599. doi: 10.1001/jama.2021.5607.
PMID: 33830171