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The virus is invisible. Massive testing makes it visible. There's a gradation of tests: forehead thermometers, CT scans, PCR.

Once it's visible, you can start demarcating red and green zones, places with more and less virus. Then you let people in green zones out of lockdown.
Basically, lockdown is like hiding from an invisible predator. If we can see the virus, we can avoid it with far less costly steps... like simply staying away from red zones.

Enormous societal investment in many different kinds of diagnosis is cheap relative to lockdown.
Many different kinds of tests, with different costs & speed. We should deploy them all as part of a funnel.

- digital diagnosis (risk based on social network signals)
- wearables
- forehead thermometer
- CT scan
- PCR
- sequencing
- serology (antibodies, after infection)
It's also not just about testing methodology, but the groups you test. Some examples:

- People at border crossings
- People with symptoms
- People after recovery via serology tests
- People without symptoms in a given area at random

All of these give info on the viral "funnel"
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