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Ashmedai's avatar

This is a brilliant exposition & very clearly written. Thanks so much!!

Btw, an early study from Italy (Systemic and mucosal antibody secretion specific to SARS-CoV-2 during mild versus severe COVID-19; https://www.biorxiv.org/content/10.1101/2020.05.21.108308v1 ) reported that:

“Interestingly, we were able to detect S protein-specific IgA in the mucosal samples of several subjects in the absence of seropositivity. Additionally, a few other individuals also had detectable S protein-specific IgG in their nasal fluids despite being IgG seronegative”

and

“Interestingly, in 15–20% of S protein-seronegative individuals, we were able to detect S protein-specific IgA antibodies at several mucosal sites. Furthermore, mucosal S protein-specific IgA levels inversely correlated with patient age, suggesting increased mucosal antibody responses in younger SARS-CoV-2-exposed individuals”.

Considering that the trial participants were heavily tilted in favor of younger ppl, well.....

I wonder what might turn up if there was mucosal antibody surveillance on trial participants, which could capture the more mild cases that didn't seroconvert. If for instance in the placebo there is higher proportion/incidence of mucosal Abs w/o humoral Abs, that would imply that *severity* was higher in the vax arm.

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Diana Prince 🦸‍♀️'s avatar

👆 THIS 👆 Is why I'm a paid subscriber!

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