It may not have been a false negative - Omicron in particular rises quite fast from "not enough virus to register on the rapid test" to "whoops you've got plague", and for the general population (my weird travails aside) the correlation between negative test and not being infectious for the next few hours is really strong.
So there's hope that your sister was genuinely uninfectious at lunchtime, even with a positive test that evening.
Learning about the speed with which one can go from negative to positive test has shifted me from testing first thing in the morning on the days I have plans, to just before I'm leaving my house to do the risky thing (mostly hockey, but occasional other meetings with people face to face).
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Date: 2022-02-15 07:33 am (UTC)It may not have been a false negative - Omicron in particular rises quite fast from "not enough virus to register on the rapid test" to "whoops you've got plague", and for the general population (my weird travails aside) the correlation between negative test and not being infectious for the next few hours is really strong.
So there's hope that your sister was genuinely uninfectious at lunchtime, even with a positive test that evening.
Learning about the speed with which one can go from negative to positive test has shifted me from testing first thing in the morning on the days I have plans, to just before I'm leaving my house to do the risky thing (mostly hockey, but occasional other meetings with people face to face).