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This article explains the tests well
https://theconversation.com/coronavirus-tests-are-pretty-accurate-but-far-from-perfect-136671
Tests are now possible for travel to Hawaii and could be to London soon.
Vienna Airport now offers passengers the possibility to have a COVID-19 PCR test at the airport. The test findings are available within about three to six hours.
People travelling to Austria at the present time must either present a medical certificate which confirms negative COVID-19 test results (PCR test not older than four days), or else they are required to begin a 14-day quarantine.
If a PCR test is made during the quarantine and a negative COVID-19 result is obtained, the quarantine periods can also be prematurely terminated.
This article explains the tests well
https://theconversation.com/coronavirus-tests-are-pretty-accurate-but-far-from-perfect-136671
Tests are now possible for travel to Hawaii and could be to London soon.