Very interesting study out of Denmark looking at SARS-CoV-2 reinfections:
- 0.65% symptomatic reinfections after 7 months
- in sensitivity analysis this doubled to 1.2%
- estimated ~80% short-term protection against reinfection
- 0.65% symptomatic reinfections after 7 months
- in sensitivity analysis this doubled to 1.2%
- estimated ~80% short-term protection against reinfection
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 research
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
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 analysis
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
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