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#antigen

1 post1 participant0 posts today

" Testing.

If you get a negative…

False negatives at the beginning of infection are very common, thanks to the virus mutating. In a recent study, & tests only agreed 47-58% of the time. If they did agree, there was a 1-8 day delay between a PCR turning positive & an antigen test turning positive.

The higher we are in a wave, the more skeptical you should be of a negative result. There are 2 things you can do to help reduce false negatives

Swab throat & salvia. These are positive days before the nose.

Repeat testing. 2 tests within 48 hours catch 92% of cases & 39% of cases. 3 tests 48 hours apart detected 94% of symptomatic & 57% of asymptomatic patients.

If you get a positive…
Positives are positives. You’re infectious.

The faintness of a line provides clues, though:

Very bold line= you’re very contagious.

Barely see the line= you’re at the beginning or the end of your infection window."

yourlocalepidemiologist.substa

1/n

Your Local EpidemiologistRiding the COVID-19 waves: 2023 styleBy Katelyn Jetelina

When to test for

"People often have questions regarding home rapid Covid tests. A new study shows that if someone is exposed to Covid but they do not have symptoms, they should do a rapid antigen test three times at 48 hour intervals (i.e. day 1, 3, 5) in order to rule out a COVID infection. But, if someone has Covid symptoms after an exposure, they should do a rapid antigen home test two times separated by 48 hours (i.e. day 1 and day 3) in order to rule out being infected."

acpjournals.org/doi/10.7326/M2

Source:drruth.substack.com/p/covid-ne