Interesting results on protection conferred by previous infection when reinfected (both pre-Delta)
Previous infection reduces death upon infection by 61% (56-65%).
Vaccination clearly increases protection even after previous infection. 1/
journalofinfection.com/article/S0163-…
Previous infection reduces death upon infection by 61% (56-65%).
Vaccination clearly increases protection even after previous infection. 1/
journalofinfection.com/article/S0163-…
https://twitter.com/OutbreakJake/status/1485969955803774978
This was all pre-Omicron, even pre-Delta. The numbers are likely quite a lot worse for people who were infected a year ago and haven't gotten vaccinated since.
One needs to be careful to not compare the numbers directly with vax effectiveness: 2/
One needs to be careful to not compare the numbers directly with vax effectiveness: 2/
Vax effectiveness (against death) is composed of a) protection against getting infected and b) protection against death once infected.
The ~90-95% we got for mRNA vax pre-Omicron included a) and b).
Here, only b) was estimated. 3/
The ~90-95% we got for mRNA vax pre-Omicron included a) and b).
Here, only b) was estimated. 3/
However, for a previous infection to be as protective as a double vax, it would need to prevent ~75% or more of infections. That's very very unlikely.
So my reading would be: a single previous infection gives a little protection, but much less than a double vax. Let alone triple.
So my reading would be: a single previous infection gives a little protection, but much less than a double vax. Let alone triple.
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