September 19, 2021

The vaccination coverage of the departments distorted by the mobility of the French

Since January 26, Public Health France (SPF) has published every day, on the government’s open data portal, numerous pieces of information on the French vaccination campaign against Covid-19, which allow, among other things, to monitor its deployment on a day-to-day basis.

The departmental data collected by SPF count the vaccinated by place of injection, and not by place of residence. Thus, if a Parisian is vaccinated at the Stade de France, he will inflate the figures for the department of Seine-Saint-Denis, where this vaccination center is located, and not that of Paris, where he resides.

The Health Insurance put online, on May 30, a complete portal on vaccination, whose departmental data corrects precisely this bias, by counting the vaccinated by place of residence. These data reveal quite clear differences in certain departments between the vaccination coverage calculated by SPF and by the Health Insurance.

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Seine-Saint-Denis late

The difference between the two figures is very clear in Seine-Saint-Denis. It was expected, as concerns have multiplied about the slowness of vaccination in this department particularly affected by the epidemic. As of May 23, the date of the latest data available, the department had a vaccination coverage in the first doses of 28%, according to the figures by injection site communicated by SPF. But with regard to the data by place of residence of the Health Insurance, the vaccination coverage of the inhabitants of Seine-Saint-Denis is 22.6%, or 5.4 points less. The difference is less for people who have been fully vaccinated (- 1.64 points), which suggests that the lag is accentuated by the first injections, which would correspond both to the rise in power of the Stade de France vaccinodrome and to the extension of vaccination to younger categories.

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Co-managed by the Regional Health Agency (ARS) of Ile-de-France, the Departmental Council of Seine-Saint-Denis and the town hall of Saint-Denis, this large vaccination center opened on April 6 had no ceases to increase its capabilities. As of June 3, 141,000 people had been vaccinated there in just under two months, according to the ARS, contacted by The world. Of this total, only 45% are residents of the department, according to the Departmental Council. This difference explains approximately 86% of the delay in the first injections observed.

Looking at the age groups, we see that the vaccination coverage of 75 years and over in Seine-Saint-Denis was only 72%, while it was 79% at the national level, that is to say seven points below. . But most of the difference comes from those under 75: 20% of the inhabitants of the department are vaccinated, against 30% in mainland France. This may be linked to the fact that the population of Seine-Saint-Denis is one of the youngest in the country: there are only 22% of inhabitants aged 55 and over, who have been given priority in access. vaccines, instead of 33% nationally.

Some of the Yvelinois have been vaccinated elsewhere

Unlike Seine-Saint-Denis, where the population is less vaccinated than in the rest of Ile-de-France, are departments where a significant portion of the population has been vaccinated elsewhere.

This is the case in the first place of Yvelines, of which 34.9% of the inhabitants were vaccinated on May 23, while the data by place of injection was rather at 30%. This significant difference is further increasing among the oldest: 93,000 inhabitants of the department aged 75 and over are vaccinated while the Yvelines have vaccinated “only” 80,000 people.

The neighboring Hauts-de-Seine department has a fairly similar profile. In Paris, coverage of over 75s greater than their own vaccination capacities suggests that older Parisians have been very mobile in finding their doses. On the other hand, the capital shows a negative difference for those under 75, which means that residents of neighboring departments have also been vaccinated there.

With departments of small area and strongly interconnected with each other, the particular situation of the Ile-de-France region is not a big surprise. On the other hand, other departments show differences that are more difficult to explain.

Ariège, Lot and Orne vaccinate more than their populations

Among the territories with the most marked differences are some rather rural departments.

Ariège shows a greater gap in vaccine coverage than Seine-Saint-Denis, with a 6.3 point difference: the department distributed around 65,000 doses, but its inhabitants only received 55,000. can be explained by the proximity of the metropolis of Toulouse as well as by the mobilization of the ARS Occitanie and the prefect of the department, who have multiplied the events accessible to all public in recent weeks. Contacted by The world, ARS Occitanie has not yet responded to our requests.

On the other hand, the cases of Lot and Orne are more difficult to explain: these two departments, further away from large population basins, still show clear differences between the number of doses received by their inhabitants and the number those distributed in their territories. Thus, in the Orne, 28,000 over 75s received a first dose, while data from SPF show that the centers and professionals of the department have injected 31,500 in this category of the population.

Among the areas where the differences are the most clear are also the two Corsican departments, which distributed around 10,000 more doses than those received by their inhabitants. However, it is too early to attribute this delay to a supposed “vaccine tourism”.