High vaccine coverage and non-pharmaceutical interventions decreased hospitalizations and deaths due to the Omicron variant in Newfoundland and Labrador, Canada

In Newfoundland and Labrador, Canada, actual booster rollout during the Omicron wave prevented about 519 hospitalizations and 122 deaths (Dec 15, 2021–Dec 15, 2022), cutting hospitalizations by 25.9% and deaths by 30.9%.

• Why it matters: With high pre-Omicron vaccination coverage, it was unclear how booster timing and reliance on non-pharmaceutical interventions jointly shaped severe outcomes during Omicron BA.1.
• What they did: The study used a vaccination-stratified epidemiological model calibrated to serology data, comparing actual vaccination against counterfactual rollout strategies under actual, strict, and no NPI scenarios.
• The result: Higher primary series coverage (81.3%), higher final booster coverage (57.3%), and NPIs sustained for 89 days after BA.1 establishment were linked to the modeled reductions, and earlier/faster boosters shortened strict NPI duration needed to meet hospitalization targets.

AI summary of the abstract · may contain errors · not medical advice · read the paper.