A couple of weeks ago, didn't Johnson and Johnson release data indicating that their vaccine shows no waning at all after six months? (That was the one-dose original regimen. Presumably the two-dose version would last even longer.)
Since we don’t have data on the waning of the same endpoint for Pfizer, it’s pretty hard to make any comparison here, but the J&J effectiveness was always lower to begin with after a second dose. Since we’re comparing very different populations, vaccines, and endpoints here it’s very hard to say whether there’s a meaningful difference between vaccines in this regard. Maybe it’s just that every vaccine settles out at the ~68% effectiveness against disease that a single dose of J&J started with. That wouldn’t be so bad, really.
Until very recently J&J didn't have a second dose. It's the experimental second dose that's raising efficacy to a claimed 94% (in the United States) against symptomatic disease.
A couple of weeks ago, didn't Johnson and Johnson release data indicating that their vaccine shows no waning at all after six months? (That was the one-dose original regimen. Presumably the two-dose version would last even longer.)
Since we don’t have data on the waning of the same endpoint for Pfizer, it’s pretty hard to make any comparison here, but the J&J effectiveness was always lower to begin with after a second dose. Since we’re comparing very different populations, vaccines, and endpoints here it’s very hard to say whether there’s a meaningful difference between vaccines in this regard. Maybe it’s just that every vaccine settles out at the ~68% effectiveness against disease that a single dose of J&J started with. That wouldn’t be so bad, really.
Until very recently J&J didn't have a second dose. It's the experimental second dose that's raising efficacy to a claimed 94% (in the United States) against symptomatic disease.
https://www.statnews.com/2021/09/21/johnson-johnson-says-additional-dose-boosts-covid-vaccine-efficacy/
Sorry, that was a brain fart. I meant to say “after a single dose.” Probably the comment makes more sense now.