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Emerg Infect Dis
; 28(4): 881-883, 2022 04.
Article
in English
| MEDLINE | ID: covidwho-1674280
ABSTRACT
Of 379 severe acute respiratory syndrome coronavirus 2 samples collected in New York, USA, we detected 86 Omicron variant sequences containing Delta variant mutation P681R. Probable explanations were co-infection with 2 viruses or contamination/amplification artifact. Repeated library preparation with fewer cycles showed the P681R calls were artifactual. Unusual mutations should be interpreted with caution.