US variants data
https://covid.cdc.gov/covid-data-trac…
https://www.nytimes.com/interactive/2…
US omicron history:
November 29
Index patient, 48 year old unvaccinated man, Nigeria
Nebraska, 6 people diagnosed by PCR and genomic sequencing
Onset was 73 hours (range = 33–75 hours)
Incubation period