Vietnam mystery: each fifth dies. After nobody died 6 months.

Before 31 July no deaths. 31 July - 16 August 24 deaths.

These people become sick (we have no better data) between 6 July and 2 August. The number of new cases for this period is 265.

Thus mortality is 8.3%. Unfortunately, I have no data of recovered cases but today (15/08/2020) there are 481 active cases and 2 August there were 241 active case. After 7 July there have been 596 new cases. Thus there 115 closed cases. Thus lethality (ratio deaths to closed cases) is 20%. Each fifth.

Why? What happened? We do not know. But we must think.