To achieve these results, the researchers established a mathematical model using INSEE data relating to professional situations, social contacts, and socio-demographic characteristics. Different scenarios were then brought to light to assess the impact of a reactive vaccination strategy depending on the dynamics of the epidemic. It shows in particular that whatever the scenario, the strategy of reactive vaccination works all the better as the vaccination coverage is low. In fact, the higher the vaccination coverage, the higher the probability that the relatives of the infected person are already vaccinated. “In most scenarios, with the same number of vaccine doses, a reactive strategy is more effective than other vaccination strategies in reducing the number of Covid-19 cases”, summarizes the institute in a press release.
As a benchmark, “in a context where vaccination coverage is around 45% and where viral circulation is high, the reduction in the number of cases over a two-month period increases from 10 to 16%”, with reactive vaccination, compared to a mass vaccination strategy, continues Inserm.
