They have to do screening because of false positives. Also positivity rate (% of people who a doctor said yes get tested because of contact or clear symptoms) is 4-10%. So no likely (>.9^4) none of those people have COVID
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From a statistical pov, you cannot just exclude samples because you are afraid that they are false positives if you know the false positive rate, no? If they test positive and you doubt the result, test them again. Otherwise, give out estimates for the aggregation.
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Testing strategy differ around the world. We have got testing points in front of hospitals. You pay for the test (70-100 USD roughly)...
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Our strategy of “strict lockdown” started since 12th of March seems work now. Surprisingly small amount of ER visits. We await first wave of “delayed cases” these hours...
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The same in Russia, only there are paid tests already. Though I'm sure not everybody can afford one.
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This has been standard procedure in Germany as well (at least for the longest time - or you needed to have been in a "high risk" area outside germany). However, here they probably did get most of the transmission chains, so it apparently did a decent job. In US - I'd be sceptic.
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Canada too
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