Contamination and transmission: the ComCor study reveals the secrets of Covid-19 in France

The Institut Pasteur has just published a document on the most frequently observed contamination conditions. If collective meals are logically presented as dangerous, other results seem more counter-intuitive.

Where and how do the French get Covid-19? Do you catch the virus by meeting strangers or during a family meal? France is beginning to understand and prioritize the main vectors of infections. A case-control study (comparing the behavior of infected people with those of non-carriers) has just been published on Thursday, December 17 under the name of “ComCor», By the Pasteur Institute, in partnership with the National Health Insurance Fund (Cnam), Public Health France, and the IPSOS institute.

The survey, led by Professor Arnaud Fontanet, who is also a member of the Scientific Council, had previously been brought to the attention of Jean Castex, who stressed that “confirms elements of international scientific studies“. It is based on a large sample of cases of infection: the organizations, which had sent 370,000 emails, received 30,330 responses, people having probably been infected between October 17 and October 30, that is, during the period of the first curfew. Among them, 4,686 were treated separately, coming from nursing staff. All the responses were compared to 3426 questionnaires from negative witnesses, to distinguish activities and behaviors that were more or less risky than the average.

Meals “play a central role” in contaminations

First information: less than half of respondents (44%) identified the contaminating person. 21% of the panel say “suspecting a particular event without knowing the person causing the infection”, And 35% simply do not know how they got the Covid-19.

Among the French who know who gave them the virus, a third mention their home, and in these cases, it is most often the spouse who transmitted the disease. The Institute also notes a possibility of underestimation of transmission by children, often asymptomatic or almost. For the two-thirds who say that someone outside the home has infected them, it may still be a person “in the family circle”(33.1%), if not in the professional environment (28.8%), then finally among friends (20.8%). The study points out that meals “play a central role», As well as shared offices, and all types of physical meetings. The predominance of infectious “relativesIs logical, because it is in their company that the guard of barrier gestures is often lifted.

Other risk factors include having children in school (from nursery school to high school), having car pooled or having taken a trip abroad. Bars, restaurants and sports halls are also considered dangerous, a confirmation that the government did not wait to act … Despite all the complaints and economic fears that we know.

“Going to shops”, a protective activity?

Asked to describe their professional situation in addition to certain aspects of their daily life, the respondents made it possible to identify the job categories presenting an increased risk, or on the contrary lower, of contamination. Administrative and commercial company executives are cited as more exposed than average, as are, not surprisingly, the intermediate professions in health and social work, but also workers in industry and drivers.

Conversely, people less likely to catch Covid-19 at work are teachers and scientists, in school or university, as well as several types of civil servants: administrative intermediaries, service agents. Administrative positions are rather preserved, even in business. Students, farmers and stay-at-home parents are also less at risk.

Finally, some findings from the Institut Pasteur seem more counter-intuitive. Activities that common sense thinks are risky would actually lower the risk of contamination. “Take the bus or tram“And”having frequented shops (food, ready-to-wear, etc.)Are thus two protective activities! The metro or the RER are not mentioned, despite the fact that 21% of respondents to the study come from Île-de-France. Anyway, these observed reductions in risk timely support the government’s strategy, which has been trying since the start of the epidemic to make daily public transport work, and which authorized the reopening of shops on November 28. . Arnaud Fontanet, however, insisted on the “cautionNecessary in interpreting the results of the study.

SEE ALSO – “It’s not at work that we get infected”, emphasizes Élisabeth Borne


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