I thought rapid tests were generally considered to have a much lower false negative rate for detecting contagiousness, though they often miss people who are infected but not yet contagious. I forget why I think this, and haven’t been following possible updates on this story, but is that different from your impression? (Here’s one place I think saying this, for instance: https://www.rapidtests.org/blog/antigen-tests-as-contagiousness-tests) On this story, rapid tests immediately before an event would reduce overall risk by a lot.
The main reason I don’t automatically make a huge adjustment for this is that it seemed that there were still ~25% false negatives at peak contagiousness by PCR according to some studies. And 40% false negatives a few days later. All sort of things are possible, like that these studies included many asymptomatic and acontagious cases, but having seen anecdotal corroboration of this phenomenon, I’m inclined to think something weird is going on.
But I should give some weight to it though—perhaps 2x less ineffective when compared to contagiousness, so maybe 60% efficacy for rapid and 75% for PCR?
I thought rapid tests were generally considered to have a much lower false negative rate for detecting contagiousness, though they often miss people who are infected but not yet contagious. I forget why I think this, and haven’t been following possible updates on this story, but is that different from your impression? (Here’s one place I think saying this, for instance: https://www.rapidtests.org/blog/antigen-tests-as-contagiousness-tests) On this story, rapid tests immediately before an event would reduce overall risk by a lot.
Ah, good point.
The main reason I don’t automatically make a huge adjustment for this is that it seemed that there were still ~25% false negatives at peak contagiousness by PCR according to some studies. And 40% false negatives a few days later. All sort of things are possible, like that these studies included many asymptomatic and acontagious cases, but having seen anecdotal corroboration of this phenomenon, I’m inclined to think something weird is going on.
But I should give some weight to it though—perhaps 2x less ineffective when compared to contagiousness, so maybe 60% efficacy for rapid and 75% for PCR?