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Updated: Aug 15, 2025

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
Published on: July 4, 2007
Pandemic modelling for regions implementing an elimination strategy
Amy Hurford1, Maria M Martignoni2, J Concepción Loredo-Osti2
1Memorial University of Newfoundland, Department of Biology, St. John's, NL A1C 5S7, Canada; Memorial University of Newfoundland, Mathematics and Statistics Department, St. John's, NL A1C 5S7, Canada.
New epidemiological models help regions with COVID-19 elimination strategies manage risks from imported cases and relax restrictions safely as vaccination increases. This research informs pandemic response planning.
Area of Science:
- Epidemiology
- Mathematical Modeling
- Public Health
Background:
- Some countries and regions successfully used COVID-19 elimination strategies with strict border controls.
- Travel-related cases dominated in Atlantic Canada (Newfoundland and Labrador, Nova Scotia, Prince Edward Island) from July 2020 to May 2021.
- Existing epidemiological models are insufficient for regions with elimination strategies.
Purpose of the Study:
- To adapt importation modeling for regions employing COVID-19 elimination strategies.
- To assess the impact of interventions on imported cases and community spillovers.
- To develop a framework for evaluating the relaxation of public health restrictions.
Main Methods:
- Extended importation modeling to include post-arrival travel restrictions and local interventions.
- Analyzed expected daily spillovers, including the impact of the Omicron variant.
- Developed a method to characterize potential community outbreaks and applied it to a specific region.
Main Results:
- Expected daily spillovers significantly increased with the Omicron variant, surpassing previous pandemic highs.
- By December 24, 2021, expected spillovers were 44% higher than the previous peak.
- The study predicted the effect of variants and vaccination on hypothetical outbreak sizes.
Conclusions:
- The developed methodology can assess risks in elimination strategy regions.
- It provides a tool to evaluate plans for safely relaxing restrictions with high vaccination coverage.
- This research supports preparedness for future pandemics.
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