We compared serial intervals and incubation periods for SARS-CoV-2 Omicron BA.1 and BA.2 subvariants and Delta variants in Singapore. Median incubation period was 3 days for BA.1 versus 4 days for Delta. Serial interval was 2 days for BA.1 and 3 days for BA.2 but 4 days for Delta.
Keywords: COVID-19; Delta; Omicron; SARS-CoV-2; Singapore; coronavirus disease; incubation period; respiratory infections; serial interval; severe acute respiratory syndrome coronavirus 2; variant of concern; viruses; zoonoses.