I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance). I understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as. The research protocol was approved by the institutional review board at the Zhejiang Provincial Center for Disease Control and Prevention.Īll necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived. The details of the IRB/oversight body that provided approval or exemption for the research described are given below:

I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained. This study is funded by Zhejiang Basic Public Welfare Research Project grant LGF21H260003. The authors have declared no competing interest. Consequently, the burden of asymptomatic transmission could potentially dominate the spreading in certain scenarios. Asymptomatic cases are harder to detect compared to symptomatic cases. Meaning The transmissibility of asymptomatic COVID-19 cases is not low.

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