Funding for this research was provided by:
State Key Laboratory for Infectious Disease Prevention and Control, China CDC (2015SKLID304)
Received: 14 November 2020
Accepted: 12 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board and Human Research Ethics Committee of the Taiyuan Center for Disease Prevention and Control, and the written consent was obtained. The children were enrolled after informed and verbal consent was obtained from the parents or guardians. Although the option of written approval was also provided, all participants chose to give their verbal consent due to convenience. Tests were performed on existing stool samples, and no additional tests involving any invasive procedures, were performed on patients. These procedures were approved by the above ethics committee.
: Not applicable.
: No competing interests.