For some previous historical data sets, you can view them through a third party that specializes in providing data services, but generally such queries need to be charged.
2. official website search
If you want to check the previous epidemic data set for free, you can also go to official website of each local health and health commission. The website will have an epidemic column, which integrates the latest and previous epidemic data. The disadvantage of this method is that it is troublesome to filter.
3. Big data monitoring system