Empirical studies have indicated that individuals may be most infectious during the presymptomatic phase, an unusual characteristic for a respiratory infection.
Our results indicate that silent disease transmission during the presymptomatic and asymptomatic stages are responsible for more than 50% of the overall attack rate in COVID-19 outbreaks. Furthermore, such silent transmission alone can sustain outbreaks even if all symptomatic cases are immediately isolated.
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The implications of silent transmission for the control of COVID-19 outbreaks
Since the emergence of coronavirus disease 2019 (COVID-19), unprecedented movement restrictions and social distancing measures have been implemented worldwide. The socioeconomic repercussions have fueled calls to lift these measures. In the absence of population-wide restrictions, isolation of...www.pnas.org
Maybe it being new has an impact on this.
I liken it to some ISU football seasons with a 'new' approach. Comes out strong and ready for about a quarter and then eventually it's just the same old ****.
