Testing is an important component to stopping the virus as up to 1/3 of those spreading the virus are asymptomatic. It is important for schools to reopen safely that they have testing and can quickly identify faculty, staff and children who are transmitters of the virus. For travel it is also important to be able to quickly check for covid before allowing people on planes. You have to ramp up testing to identify sources of the virus so you can stop the spread. In 2020 covid was spreading without testing because many who were spreading it didn't know they had it and did not quarantine themselves.
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