An iterative algorithm for optimizing COVID-19 vaccination strategies considering unknown supply

PLoS One. 2022 May 2;17(5):e0265957. doi: 10.1371/journal.pone.0265957. eCollection 2022.

Abstract

Background and objective: The distribution of the newly developed vaccines presents a great challenge in the ongoing SARS-CoV-2 pandemic. Policy makers must decide which subgroups should be vaccinated first to minimize the negative consequences of the pandemic. These decisions must be made upfront and under uncertainty regarding the amount of vaccine doses available at a given time. The objective of the present work was to develop an iterative optimization algorithm, which provides a prioritization order of predefined subgroups. The results of this algorithm should be optimal but also robust with respect to potentially limited vaccine supply.

Methods: We present an optimization meta-heuristic which can be used in a classic simulation-optimization setting with a simulation model in a feedback loop. The meta-heuristic can be applied in combination with any epidemiological simulation model capable of depicting the effects of vaccine distribution to the modeled population, accepts a vaccine prioritization plan in a certain notation as input, and generates decision making relevant variables such as COVID-19 caused deaths or hospitalizations as output. We finally demonstrate the mechanics of the algorithm presenting the results of a case study performed with an epidemiological agent-based model.

Results: We show that the developed method generates a highly robust vaccination prioritization plan which is proven to fulfill an elegant supremacy criterion: the plan is equally optimal for any quantity of vaccine doses available. The algorithm was tested on a case study in the Austrian context and it generated a vaccination plan prioritization favoring individuals age 65+, followed by vulnerable groups, to minimize COVID-19 related burden.

Discussion: The results of the case study coincide with the international policy recommendations which strengthen the applicability of the approach. We conclude that the path-dependent optimum optimum provided by the algorithm is well suited for real world applications, in which decision makers need to develop strategies upfront under high levels of uncertainty.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Algorithms
  • COVID-19 Vaccines
  • COVID-19* / epidemiology
  • COVID-19* / prevention & control
  • Humans
  • Influenza Vaccines*
  • Influenza, Human* / epidemiology
  • SARS-CoV-2
  • Vaccination

Substances

  • COVID-19 Vaccines
  • Influenza Vaccines

Grants and funding

This research was funded by the Gordon and Betty Moore Foundation through Grant(GBMF9634) to Johns Hopkins University to support the work of the Society for Medical Decision Making COVID-19 Decision Modeling Initiative and partially funded by the Austrian Federal Ministry for Digital and Economic Affairs BMDW and handled by the Austrian Research Promotion Agency (FFG) within the Emergency Call for research into COVID-19 in response to the SARS-CoV-2 outbreak (CIDS -- Concurrent Infectious Disease Simulation) (881665). The authors acknowledge TU Wien Bibliothek for financial support through its Open Access Funding Programme. The authors had complete and independent control over study design, data collection and analysis, interpretation of data, report writing, decision to publish, and preparation of the manuscript.