People are assuming it would have been different with 2 doses, which might be true, but it's hardly obvious. There was an outbreak in my grandmother LTCF after every resident had received 2 doses and according to the doctor my father talked to this is not uncommon.
As I said in January, I think there are good reasons to think the most vulnerable people were undersampled in the trials, so unfortunately I suspect we're going to find out that vaccines are less effective on this group, even after 2 doses.
If this turns out to be true, it's very important that public health officials and the media don't lie about it to maintain trust in vaccines, because I think it will inevitably backfire and make things even worse. Unfortunately it's probably what they'll do though.
To be clear, this is not a criticism of vaccines, which are still the only way we are going to end this. I'm just saying that they probably aren't effective as trials suggested on the most vulnerable people and that it's important not to lie about that.
What I fear is that public health officials and journalists are going to lie about this, but eventually people will find out and they will conclude that vaccines are useless for everybody. Sadly I think it's very likely that it's exactly what is going to happen.

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More from @phl43

9 Apr
Epidemiologists claim that B.1.1.7 is far more transmissible than the historical lineage. In this post, I look at what happened in France and argue that, while B.1.1.7 initially had a large transmissibility advantage, it's been going down rapidly. (THREAD) cspicenter.org/blog/waronscie…
Various studies have estimated B.1.1.7's transmissibility advantage, but I focus on Gaymard et al. (2021), which found that it was between 50% and 70% more transmissible and has been used to calibrate official projections in France. eurosurveillance.org/content/10.280…
This estimate is based on fitting a simple exponential growth model to only 2 data points from January, during the early expansion of B.1.1.7 in France. This is problematic for several reasons and I won't get to the worst of them until the end of the thread, so stick with me.
Read 61 tweets
5 Apr
Ce qu'il faut bien comprendre, c'est que si le virus a causé un tel excès de mortalité et fait peser une telle pression sur le système hospitalier, ce n'est pas tant parce qu'il est intrinsèquement très dangereux que parce que la population était immunologiquement naïve.
Quand tout le monde ou presque aura été infecté ou vacciné, donc aura développé une immunité, le taux de létalité s'effondrera et SARS-CoV-2 sera juste un autre virus respiratoire parmi les plus de 200 en circulation que la plupart des gens choperont plusieurs fois dans leur vie.
C'est pour ça que les adeptes du #ZeroCovid sont déconnectés de la réalité : même si c'était possible d'éradiquer SARS-CoV-2 de façon permanente, ça n'arrivera jamais parce que le virus aura un impact beaucoup moins important à l'avenir, donc tout le monde apprendra à vivre avec.
Read 4 tweets
31 Mar
Pitié, qu'il arrête son baratin et nous dise à quelle sauce on va être mangé, on s'en fout de ses envolées lyriques.
Moi attendant que Macron entre enfin dans le vif du sujet.
Bien sûr que si on ne faisait rien les choses s'amélioreraient d'elles-même ! Image
Read 11 tweets
1 Mar
Voici un kit pour devenir épidémiologiste sous forme de texte à trous : "Nous sommes au bord du précipice, l'explosion est prévue pour X. Je préconise un reconfinement de Y semaines dès maintenant pour éviter un désastre. Le mois de Z sera dans tous les cas très difficile."
Gros avantage de ce kit : il est réutilisable plusieurs fois car, même si le résultat a déjà été infirmé par la réalité à plusieurs reprises, vous pouvez remplir les trous avec d'autres valeurs et on continuera à vous prendre au sérieux.
Un jour ou l'autre, vous finirez surement par avoir raison et vous pourrez alors parader sur les plateaux de télévision en prenant une mine déconfite pour déplorer qu'on ne vous ait pas écouté plus tôt, ce qui aurait évité le désastre 👌
Read 4 tweets
1 Mar
Si le couvre-feu dure encore 6 semaines, nous aurons été assignés à résidence tous les jours à 18H pendant 3 mois au total, alors qu'on ne sait même pas si ça a eu le moindre effet. On nage vraiment en plein délire.
Pour ceux qui objectent que, si on lève le couvre-feu et que ça se remet à exploser, il faudra reconfiner et ce sera encore pire : vous partez du principe que, si ça se remet à exploser, on sera dans l'obligation de reconfiner, mais c'est faux !
Si ça se remet à exploser, il n'y a pas besoin de confiner, parce que les gens changeront leurs comportements et que ça se remettra à baisser rapidement comme *partout* où les autorités n'ont pas confiné.
Read 4 tweets
6 Feb
I'm glad the claims based on Flaxman et al.'s paper were removed, and I appreciate the willingness to quickly make corrections after I pointed out the issue, but unfortunately the new version is still misleading and should also be revised. I explain why in this short thread.
I take issue with both the estimates of the number of deaths that would have been caused/averted by a later/earlier lockdown and the claim that this study addresses the criticism that people would have made voluntary behavior changes that would have slowed transmission anyway.
I start with the second claim, since once I have explain why it's mistaken, it will become clear that we can't take the estimates of the number of deaths that would have been caused/averted from that paper seriously.
Read 20 tweets

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