The dynamics of Delta and Omicron establishment and dominance in US states medrxivpreprint MassGeneralNews broadinstitute Delta Omicron COVID19 coronavirus covid
By Pooja Toshniwal PahariaJul 5 2022Reviewed by Danielle Ellis, B.Sc. In a recent study posted to the medRxiv* preprint server, researchers analyzed the severe acute respiratory syndrome coronavirus 2 Delta and the Omicron variants of concern establishment and predominance dynamics in the United States .
The team utilized publicly accessible data on the rates of SARS-CoV-2 incidences and vaccinations and VoC fractions for evaluating Delta VoC and Omicron VoC establishment and predominance dynamics. They assessed the association between state-level anti-SARS-CoV-2 immunity and the date, timing, and rate of VoC transition.
The date VoC proportions surpassed 50% was considered the VoC dominance date. The period for VoC proportion to rise to 50% from 10% was considered the period between VoC establishment and predominance. The statewide anti-SARS-CoV-2 immunity was estimated using terms such as the completely vaccinated proportion, the boosted proportion, the proportion with prior COVID-19, and the proportion with prior full/booster vaccinations or prior COVID-19.
No association was found between the population-level immunity and rates of variant takeover with substantial delay in the takeover of the Omicron VOC and non-substantial trends for delayed Delta takeover date in US states comprising completely vaccinated individuals.
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