Led between May 23 and August 13, the investigation by the Institut Pasteur reveals a risk of infection multiplied by 3.4 during private evenings in children under 40 and highlights the increased risk related to The presence of a child in the home in more than 40 years.
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The evenings with friends and bars in children under 40; the presence of a child at home for over 40 years; But also the plane, the train, the car shared with relatives and the metro: these are the main places and circumstances of contamination by the Variant Delta of SARS-COV-2 identified in France, between May 23 and August 13 . Findings that are not all transposable to the winter situation, especially for restaurants, which during this period were mostly frequented outdoors.
To reconstitute the scenes of this “infectious crime”, the investigators used a protocol roared: that of The Comcor study, conducted by the Pasteur Institute with the National Health Insurance Fund (CNAM), Public Health France and the Ipsos Institute . On November 26, the fourth component of this study is published in the magazine The Lancet Regional Health Europe.
This is a study “control cases” conduct nationally. Between May 23 and August 13, so the authors compared 12,634 adults infected with the SARS-COV-2 (“Case”) to 5,560 uninfected adults (“controls”), recruited within a panel national representative. “Cases” and “Witnesses” were compared during the same weeks of exposure, the authors ensuring that age and sex are equivalent in each comparative duo, as well as the region and population density of the residential place. .
The participants had to complete an online questionnaire. Then, a sophisticated statistical analysis (called “multivariate logistics regression”) determined the extent to which acute infection at SARS-COV-2 was associated with recent coronavirus exhibitor, a history of infection as well as vaccine status.
“The period studied corresponds to that of the progressive reopening of public places, as well as the appearance of the Delta Variant on the metropolitan territory,” explains the Pasteur Institute. Of the 12,634 positive persons, 8,644 (68%), in fact, have been diagnosed infected by this variant.
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This study first made it possible to identify one of the springs of the lightning dynamics of the current epidemic. Among the participants, 651 had a unique contact with the subject that infected them with the delta variant. The analysis of these persons reveals that the incubation period of this variant is 4.3 days: shorter, therefore, that the five days of incubation of the previous variants, measured in the 8,442 individuals having a contact. unique with the person who infected them.
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