A new study by Yale School of Public Health (YSPH) researchers suggests that the Pfizer-BioNTech vaccine was more than 91% effective at reducing transmission of coronavirus in Israeli households before the emergence of the delta variant. However, the combined effect of the new variant and waning vaccine-induced immunity considerably reduced the vaccine’s effectiveness against transmission over time.
Delta variant, waning immunity reduced Pfizer vaccine’s effectiveness against household transmission
January 28, 2022
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