Covid-19: nightclubs and private parties are the places where we are most infected

The Institut Pasteur is publishing this Friday the 4th part of the results of its ComCor study, on the places presenting the most risk of contamination.

Bars, public transport, supermarkets, nightclubs, cultural venues … Between the months of May and August, the Institut Pasteur combed through all of these collective spaces in order to assess the places where the contamination with Covid-19 is the most important. Crucial data while France is currently facing a fifth large-scale epidemic wave.

These conclusions, made public this Friday, constitute the fourth part of the vast ComCor study. In order to carry out this fourth phase of research, the scientists followed precisely more than 12,364 people diagnosed positive for Covid-19, including 68% with the Delta variant, and 5,560 control individuals over three months. A questionnaire providing information on the places where these individuals had been exposed to the virus had to be completed by them.

Bars, private parties and nightclubs in mind

These conclusions shed light on the significant risks of contamination involved in particular in bars, private parties or discotheques. According to these results, which can be found in The Lancet Regional Health Europe (in their full version, in English), these gathering places are at the top of the ranking of places where the risk of contamination is the highest.

The analyzes of the Institut Pasteur note for example that a person under the age of 40 who went to a bar had a 90% more chance of being infected than a person who would not have frequented this kind. establishment. In a similar comparison, the risk share even climbs to 350% for attending a private party.

+ 790% risk of contamination in nightclubs

Given its duration spread over several months, the study was able to identify the epidemic impact of various political and health decisions, such as the reopening of terraces last June or nightclubs in July, and events large-scale, like the Euro football.

Also, it is on average men under 40 who were exposed to the highest risk between June and July. Supporters’ gatherings or summer festivities have considerably increased the threat of contamination, especially in nightclubs with a jump of 790% among those under 40 and 270% among older adults.

Interesting fact: entry into an establishment of this type was, and remains today, conditional on the presentation of a health pass, as the authors of this study do not fail to mention. Also, this is additional evidence corroborating the risks of contamination and spread of Covid-19 between people with a complete vaccination schedule.

20 to 70% more risk in transport

In addition, a novelty appears within this fourth part of the ComCor study: public transport is not without risk of contamination, contrary to what had been stated previously. While the metro carries a 20% increased risk, a long-distance train ride increases this risk of contracting Covid-19 by 30%. Ditto for a car trip with relatives or friends, without respecting barrier gestures. The plane presents the greatest threat with a risk increased tenfold by 70%, but this percentage must be qualified with a potential contamination in the foreign country from which one returns.

The figures are nevertheless reassuring concerning a certain number of places which are nevertheless very frequented. Shops, apart from those classified in the category of convenience stores, cultural venues (cinemas, theaters, etc.), and hairdressing salons bear witness to positive figures.

“No doubt because we don’t necessarily stay there very long, or because we respect barrier gestures. In supermarkets, you often have a lot of height under the ceiling and it is well ventilated, explains Mahmoud Zureik, professor. of public health and epidemiology at the University of Versailles Saint-Quentin-en-Yvelines, The Parisian.

On the other hand, terraces and restaurants also benefit from convincing results, but these must be put into perspective by a situation which has since changed, with the deletion of the gauge for the maximum number of authorized customers and temporary terraces.

Having children at home increases the risk of infection

The same team from the Institut Pasteur was, in parallel, interested in the risk entailed by the presence of a child in a home, which it assesses at + 30% for a college student, and even more for children. younger.

While new health restrictions came into effect on Thursday, the Christmas festivities could be impacted again, like last year. In the columns of Parisian, Arnaud Fontanet, member of the scientific council, calls this Friday to reduce the number of guests around a dinner table “from 12 to 4”.

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