The only safe quarantine time line for SARS-CoV2/COVID-19 is 28 days for exposure and another 14 days after two negative tests after “pronounced cure date.”
Any other quarantine time line will put the R(O) well over 1.0.
And since a number of people on the Diamond Princess return flight back popped COVID-19 infections. The date of flight was the last exposure, _Not_ any data on the ship.
right, and the date of the flight was Feb 16, arriving Travis and points beyond Feb 17. 15 days ago. Which, for the first two rounds, and for bunches of ‘recovered’ out of Wuhan, was sufficient quarantine.