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Within-country age-based prioritisation, global allocation, and public health impact of a vaccine against SARS-CoV-2: a mathematical modelling analysis
Alexandra B Hogan; Peter Winskill; Oliver J Watson; Patrick G T Walker; Charles Whittaker; Marc Baguelin; Nicholas F Brazeau; Giovanni D Charles; Katy A M Gaythorpe; Arran Hamlet; Edward Knock; Daniel J Laydon; John A Lees; Alessandra Løchen; Robert Verity; Lilith K Whittles; Farzana Muhib; Katharina Hauck; Neil M Ferguson; Azra C Ghani.
Afiliación
  • Alexandra B Hogan; Imperial College London
  • Peter Winskill; Imperial College London
  • Oliver J Watson; Imperial College London
  • Patrick G T Walker; Imperial College London
  • Charles Whittaker; Imperial College, London
  • Marc Baguelin; Imperial College London
  • Nicholas F Brazeau; Imperial College London
  • Giovanni D Charles; Imperial College London
  • Katy A M Gaythorpe; Imperial College London
  • Arran Hamlet; Imperial College London
  • Edward Knock; Imperial College London
  • Daniel J Laydon; Imperial College London
  • John A Lees; Imperial College London
  • Alessandra Løchen; Imperial College London
  • Robert Verity; Imperial College London
  • Lilith K Whittles; Imperial College London
  • Farzana Muhib; PATH
  • Katharina Hauck; Imperial College London
  • Neil M Ferguson; Imperial College London
  • Azra C Ghani; Imperial College London
Preprint en En | PREPRINT-MEDRXIV | ID: ppmedrxiv-21253960
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ABSTRACT
The worldwide endeavour to develop safe and effective COVID-19 vaccines has been extraordinary, and vaccination is now underway in many countries. However, the doses available in 2021 are likely to be limited. We extended a mathematical model of SARS-CoV-2 transmission across different country settings to evaluate the public health impact of potential vaccines using WHO-developed target product profiles. We identified optimal vaccine allocation strategies within- and between-countries to maximise averted deaths under constraints on dose supply. We found that the health impact of SARS-CoV-2 vaccination depends on the cumulative population-level infection incidence when vaccination begins, the duration of natural immunity, the trajectory of the epidemic prior to vaccination, and the level of healthcare available to effectively treat those with disease. Within a country we find that for a limited supply (doses for <20% of the population) the optimal strategy is to target the elderly. However, with a larger supply, if vaccination can occur while other interventions are maintained, the optimal strategy switches to targeting key transmitters to indirectly protect the vulnerable. As supply increases, vaccines that reduce or block infection have a greater impact than those that prevent disease alone due to the indirect protection provided to high-risk groups. Given a 2 billion global dose supply in 2021, we find that a strategy in which doses are allocated to countries proportional to population size is close to optimal in averting deaths and aligns with the ethical principles agreed in pandemic preparedness planning. HighlightsO_LIThe global dose supply of COVID-19 vaccines will be constrained in 2021 C_LIO_LIWithin a country, prioritising doses to protect those at highest mortality risk is efficient C_LIO_LIFor a 2 billion dose supply in 2021, allocating to countries according to population size is efficient and equitable C_LI
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Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-MEDRXIV Tipo de estudio: Experimental_studies / Observational_studies / Prognostic_studies / Rct Idioma: En Año: 2021 Tipo del documento: Preprint
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-MEDRXIV Tipo de estudio: Experimental_studies / Observational_studies / Prognostic_studies / Rct Idioma: En Año: 2021 Tipo del documento: Preprint