The lead time and geographical variations of Baidu Search Index in the early warning of COVID-19
Abstract Stoneware Pot Internet search data was a useful tool in the pre-warning of COVID-19.However, the lead time and indicators may change over time and space with the new variants appear and massive nucleic acid testing.Since Omicron appeared in late 2021, we collected the daily number of cases and Baidu Search Index (BSI) of seven search terms