- Contact tracing by investigation, in particular before the onset of symptoms is, by nature, not exhaustive.
- In addition, the choice of 4 days before the onset of symptoms, although in agreement with the recommendations of the WHO, is arbitrary and limits the observation of previous potential contaminations.
- Furthermore, it is questionable whether the large number of secondary infections occurring quickly is not strongly linked to the fact that these contacts are also in close contact with each other within the household.
- Finally, the fact that among people in close contact, only those with symptoms were subjected to a PCR test limits the interpretation of the number of secondary infection numbers
Delineate the dynamics of COVID-19 transmission, assess the risk of infection at different exposure windows, and estimate the infectious period.
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