Subramoney K, Mtileni N, Bharuthram A, Davis A, Kalenga B, Rikhotso M, et al. Identification of SARS-CoV-2 Omicron variant using spike gene target failure and genotyping assays, Gauteng, South Africa, 2021. J Med Virol. 2022;94(8):3676-84. https://pubmed.ncbi.nlm.nih.gov/35441368/