Test positive rate - trend in recent weeks

 I computed the test positive rate for the past few months.

It increased from 1% in early September to 15% by end October. It probably remained at this level for the subsequent weeks, but the number of tests were not available.

It is strange that the test positive rate would escalate sharply to 15%.

However, this is calculated on cases, of which over 90% are mild or asymptomatic.

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