I find the raw #NYC #COVID19 testing data this story draws from confusing. [https://www1.nyc.gov/site/doh/covid/covid-19-data-testing.page …]
Diagnostic testing is clear. At the peak of the NY epidemic, March 29, a staggering 71.3% came back positive, but by Aug 1 only 1.8% were +.
So far, so good.
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2/ Antibody tests are confusing. Theoretically, Ab+ results last for months, so the net + for NYC should increase over time. But data shows 61.2% of antibody tests were + on April 11, falling to just 21.2% by Aug 1. MORE
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3/ The data is expressed as percent positive per tests performed & test volume ^ed radically between April/August in
#NYC. But what happened to overall antibody+ rates across the City? The@NYT article claims "herd immunity" reached in Corona. But the data shows a drop. Anybody?13 replies 8 retweets 22 likesShow this thread
I have been assuming that basically antibody tests are a poor proxy for having been infected, because of diminished antibodies over time and cross reactivity. But those numbers are remarkably different!
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