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I asked my brother about this as he was previously a covid specific lab supervisor for one of the major pathology companies. Bang on the money, he says you do gain by not having the complexity of batch testing but then your capacity drops significantly as you test individually. Bad situation.I suspect the money printing is not what it was.
They used to get $$ per test.
Batch it in 64.
And with a sub 2% +ve rate at least half the batches only required 1 test.
If you have a positive in the batch you split into 4s and retest 12 times for one positive for example.
With +ve rates hitting something like 20% that scale benefit breaks down and suspect your almost better off testing every sample individually