Published on in Vol 8, No 10 (2020): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19589, first published
.
![Using WeChat, a Chinese Social Media App, for Early Detection of the COVID-19 Outbreak in December 2019: Retrospective Study Using WeChat, a Chinese Social Media App, for Early Detection of the COVID-19 Outbreak in December 2019: Retrospective Study](https://asset.jmir.pub/assets/a9630e7b4ef8ecd4244ba653eb42cf40.png 480w,https://asset.jmir.pub/assets/a9630e7b4ef8ecd4244ba653eb42cf40.png 960w,https://asset.jmir.pub/assets/a9630e7b4ef8ecd4244ba653eb42cf40.png 1920w,https://asset.jmir.pub/assets/a9630e7b4ef8ecd4244ba653eb42cf40.png 2500w)
1 Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China