On the vaccination threshold for Covid-19 in French Polynesia

Gaetan Bisson (1) , Roger Oyono (1)

1 GAATI - Laboratoire de Géométrie Algébrique et Applications à la Théorie de l'Information

High immunization rates are often sought to contain epidemics with target values typically 70% or greater. Our objective is to independently assess this value in the context of the 2020 Covid-19 pandemic in French Polynesia. To this extent, we develop a graph-based epidemic model tailored to this pandemic and compute the vaccination threshold required to prevent exponential spread of the communicable disease. Our results indicate that herd immunity increases drastically when a threshold percentage of vaccinated individuals is reached. Experimental data using our idealized model indicates that the threshold value is approximately 45%. We conclude that vaccination is much more effective at preventing pandemics than usually predicted.

Domains: Santé publique et épidémiologie

Gaetan Bisson, Roger Oyono. On the vaccination threshold for Covid-19 in French Polynesia. Pacific Health, 2022, 5, ⟨10.24135/pacifichealth.v5i.59⟩. ⟨hal-03418625⟩