Vaccine Table Update: May 20, 2021

Okay, this update is heavy but important. As always, peach boxes=additions since my last table update. Explanations and data sources are below.

Moderna

  • In the “real world”, Moderna was 98.7% effective against death after both doses; 64% effective against death after 1 dose. Moderna was 77% effective in preventing hospitalization after 1 dose (here)

  • Moderna booster shot works (previous post on this here)

Pfizer

  • Works against B.1.617 variant (here)

  • One dose was 80% effective at preventing hospital admission with COVID-19
    and one dose was 85% effective at preventing death (here)

AstraZeneca

  • Covashield (the AstraZeneca vaccine manufactured in India) and Covaxin works well against B.1.617 variant (here)

  • One dose was 80% effective at preventing hospital admission with COVID-19 (here)

  • We are still waiting to see the “real world” efficacy of AZ against severe disease of B.1.351 (variant first discovered in S. Africa). The only number we have is ~10-22% for mild-to-moderate disease, but there weren’t enough COVID19 cases to be certain in this efficacy rate.

All vaccines

  • There are two ways to measure how well a vaccine works: Efficacy and immunogenicity. Immunogenicity is a more complicated metric that measures the type of immune responses that the vaccine generates and their magnitude over time (i.e. neutralizing antibodies). Until now, there was no definitive set values that “define” a protective immune response. We weren’t sure how neutralizing antibodies in a lab mapped to efficacy rate in the real world. A new, very important article (here) modeled for the first time the relationship. We can now use this mathematical model and my table together. For example…

Love, YLE