does the number of vaccinated among the newly infected really prove the ineffectiveness of the vaccine?

A queue in front of a vaccination center located at the Palais des Expositions in Nice (Alpes-Maritimes), April 23, 2021 (ARIE BOTBOL / HANS LUCAS / AFP)

The most skeptical about vaccination think they have found an unstoppable argument against the vaccine. In Israel, in early July, 40% of new patients were vaccinated people, said the former Israeli director general of health. On social networks, internet users, like some politicians, believe they see proof of the ineffectiveness of the vaccine against Covid-19. On the contrary, it is a partly reassuring trend.

Covid-19 vaccines, regardless of the lab, have never claimed to be 100% effective. The Pfizer laboratory, for example, presented in November 2020 its vaccine as 95% effective. It is therefore not surprising to find people vaccinated among the newly infected. If it may, at first glance, seem illogical to find a large proportion of vaccinated among the new patients, it is in reality purely arithmetic. The more a country vaccinates, the more likely it is to find vaccinated among the sick. To put it simply, if Israel managed to vaccinate 100% of its population, we would logically find 100% vaccinated among covid-19 patients.

The emergence of the Delta variant also contributes to increasing this proportion of vaccinated among patients. Israel says it has recently seen a decrease in the effectiveness of the vaccine in terms of the risk of becoming infected. However, the protection against the risk of developing a severe form remains 93%.

In summary, the growing proportion of vaccinated among the sick is therefore not proof of the ineffectiveness of the vaccine. The vaccine is not 100% effective and vaccination accelerating, it is logical to find more and more vaccinated among the sick.

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