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Vaccination and non-pharmaceutical interventions for COVID-19: a mathematical modelling study
Sam Moore1, Edward M Hill1, Michael J Tildesley1
1Zeeman Institute for Systems Biology and Infectious Disease Epidemiology Research, Mathematics Institute, and School of Life Sciences, University of Warwick, Coventry, UK.
The Lancet. Infectious Diseases
|March 21, 2021
Summary
Vaccination alone cannot contain SARS-CoV-2. Mathematical models show that even with high vaccine efficacy, relaxing non-pharmaceutical interventions (NPIs) risks significant COVID-19 deaths. Careful monitoring of vaccine properties and uptake is crucial.
Area of Science:
- Epidemiology
- Mathematical Modeling
- Vaccinology
Background:
- SARS-CoV-2 dynamics are complex, influenced by age, infection rates, and declining perceived risk affecting non-pharmaceutical interventions (NPIs).
- Mathematical models are essential for understanding and predicting COVID-19's long-term trajectory under vaccination programs.
Purpose of the Study:
- To predict the long-term dynamics of SARS-CoV-2 in the UK using epidemiological data and vaccine efficacy estimates.
- To assess the impact of a planned two-dose vaccination rollout on COVID-19 dynamics.
Main Methods:
- A mathematical model stratified by age and UK region was developed.
- The model was fitted to UK epidemiological data and incorporated a two-dose vaccination program with varying uptake scenarios.
- Vaccine efficacy against symptomatic disease and infection was estimated, and interactions with NPI relaxation were analyzed.
Main Results:
- Vaccination alone is insufficient to contain the SARS-CoV-2 outbreak; R remains above 1 even with optimistic vaccine efficacy.
- Relaxing all NPIs post-vaccination could lead to substantial COVID-19 deaths, ranging from 21,400 to 96,700 depending on vaccine efficacy.
- A significant proportion of deaths may occur in vaccinated individuals, highlighting the need for continued precautions.
Conclusions:
- The success of SARS-CoV-2 vaccines as a pandemic exit strategy is contingent on vaccine properties and population uptake.
- Early or rapid relaxation of NPIs poses significant risks, even with widespread vaccination.
- Continuous monitoring of vaccine effectiveness and population coverage is essential for managing the pandemic.
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