Short thread on historical cases. Typically, the number of cases reported with >= 7 days lag is pretty small; here's an example from 08/04 with only 76 out of 2486 cases reported with >= 7 days lag. However, there are changes both positive and negative dating back to March 2020!

On 09/04, a bunch of historical cases were removed, so the historic cases total went negative; -7459 >=7 days lag between 08/04 and 12/04:

However, comparing 11/04 and 12/04, it seems that some of the cases that were removed have been added back in, 1084 >= 7 days lag. Unlike the cases that were removed, these were included in the headline daily total and again there were some changes dating back to March 2020!