Early Release - Contact Tracing during Coronavirus Disease Outbreak, South Korea, 2020

Kassem CC BY-NC-SA 17/07/2020

Early Release - Contact Tracing during #Coronavirus Disease Outbreak, South Korea, 2020 - Volume 26, Number 10—October 2020 - Emerging Infectious Diseases journal - CDC
▻https://wwwnc.cdc.gov/eid/article/26/10/20-1315_article?deliveryName=USCDC_333-DM33334

Le #confinement semble bien l’explication du nombre relativement peu élevé de #transmission par les #enfants ; ces derniers seraient même d’importants propagateurs (Cf rectification en-dessous).

We analyzed reports for 59,073 contacts of 5,706 coronavirus disease (#COVID-19) index patients reported in South Korea during January 20–March 27, 2020. Of 10,592 household contacts, 11.8% had COVID-19. Of 48,481 nonhousehold contacts, 1.9% had COVID-19. Use of personal protective measures and social distancing reduces the likelihood of transmission.
[...]
We also found the highest COVID-19 rate (18.6% [95% CI 14.0%–24.0%]) for household contacts of school-aged children and the lowest (5.3% [95% CI 1.3%–13.7%]) for household contacts of children 0–9 years in the middle of school closure.

Kassem CC BY-NC-SA

Kassem @kassem CC BY-NC-SA 17/07/2020

Dr.Krutika Kuppalli sur Twitter : “What does this mean? - I believe this further supports that we need to have low rates of community transmission before we consider opening up schools - Per this data kids 10-19 had highest rates of contacts with #COVID19 - This is scientific data, let this lead our decision” / Twitter
▻https://twitter.com/KrutikaKuppalli/status/1284206297580105728

Kassem @kassem CC BY-NC-SA
Kassem @kassem CC BY-NC-SA 19/07/2020

Rectification : une très mauvaise lecture du dernier paragraphe (“we also found...) m’a fait écrire que “Le #confinement semble bien l’explication du nombre relativement peu élevé de #transmission par les #enfants », alors qu’il n’est pas dit que ces enfants étaient en situation de confinement mais seulement que les écoles étaient fermées, et ceci s’applique aussi bien aux enfants de moins de 10 ans (les moins propagateurs) qu’à ceux entre 10 et 19 ans (les plus propagateurs).

Kassem @kassem CC BY-NC-SA
Kassem @kassem CC BY-NC-SA 19/07/2020

Même si les enfants n’étaient pas en situation de confinement, la question d’une transmission plus grande lors de la réouverture de l’école reste ouverte ;
Dr Zoë Hyde sur Twitter : "A further point. Schools were closed at the time. The authors note: “Although the detection rate for contacts of preschool-aged children was lower, young children may show higher attack rates when the school closure ends, contributing to community transmission of COVID-19.”" / Twitter
▻https://twitter.com/DrZoeHyde/status/1284831731606937600

Kassem @kassem CC BY-NC-SA

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