- case definition
- how sites were determined
- model used
- mathematical methods for model

Methods for First-wave COVID-19 transmissibility and severity in China outside Hubei after control measures, and second-wave scenario planning: a modeling impact assessment

 - Mean time for a case to be detected through symptom-based surveillance was estimated to be 5.5 days (95% CI: 5.0-5.9). Mean time for a case to be detected through contact-based surveillance was estimated to be 3.2 days (95% CI: 2.7-3.8). 
- Contact-based surveillance was associated with a 2.3 day (95% CI: 1.5-3.0) decrease in reporting time.  


Mean Time from Onset to Reporting of COVID-19 in Shenzhen, China: Symptom-based Surveillance vs. Contact-based Surveillance

Mean Time from Onset to Reporting of COVID-19 in Shenzhen, China

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