Studies like this make me very jealous of my Nordic colleagues. The authors had access to linked data for *the entire country of Denmark*, which is a pretty enormous strength of the researchpic.twitter.com/y2RXr5G2Js
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Studies like this make me very jealous of my Nordic colleagues. The authors had access to linked data for *the entire country of Denmark*, which is a pretty enormous strength of the researchpic.twitter.com/y2RXr5G2Js
Basically, they looked at every PCR test done in the first wave, and followed up every person to see if they had tested positive in the first, second, or both waves Of those in the sample, 0.65% were infected twice
The BIG caveat here is that this study (as with similar ones) relies on routine PCR tests, which means that the sample is selected for people who have a symptomatic infection
While it was not statistically significant, it is interesting that the sensitivity analysis - which looked only at those who were regularly tested - found a higher incidence of reinfection than the main analysispic.twitter.com/tV8tN0BxW7
That being said, it provides further quite strong evidence that in the short-term (7ish months) symptomatic reinfection is rare. Asymptomatic reinfection may be more common, it is still hard to say
Oh, sorry, here's the link to the research: https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(21)00575-4 …
What is the specificity of the test though
Re: "Very interesting study out of Denmark looking at SARS-CoV-2 reinfections" Geneva study on re-infection for the curious, along with seroreversion: https://twitter.com/AtomsksSanakan/status/1374455579582681102 … https://www.medrxiv.org/content/10.1101/2021.03.19.21253889v1.full …pic.twitter.com/n1ibsrblAn
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