A new study comparing 4 vaccines 1) Pfizer 2) Moderna 3) J&J 4) AZ and 5) Prior Convalescent Patients for neutralization vs. Covid variants four weeks after full dosing:
- The mRNA vaccines are profoundly superior to the adenovirus vector-based vaccines at inducing neutralizing antibodies (an mRNA boost to adenovirus vector-based vaccines has been shown to be highly effective in other studies). The study also says strong neutralizing antibody responses do not alone account for the protection by current vaccines.
- Prior convalescent Covid is highly variable. Convalescent variability appears tied to severity of disease: hospitalized convalescent patients (dark gray) had more neutralization titers than patients who were not hospitalized (light gray).
- All four vaccines remained above half-maximal neutralization but the Beta, Gamma and Delta variants showed on average an 5.8-fold, 3.5-fold and 3.9-fold reduced sensitivity to neutralization from convalescent patients as well as from vaccine recipients.
- However, according to the authors, while circulating antibodies might be unable to neutralize such emerging viruses, memory B cells are still likely to recognize variants and undergo new rounds of affinity maturation, resulting in new neutralizing antibodies that should kick-in in time to prevent severe disease after infection.
- Note the importance of full vaccination
Attachment 387191
https://www.medrxiv.org/content/10.1....27.21264163v1
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