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Michael Ciaglo / Getty Last spring and summer, when a COVID-19 vaccine was only a glimmer of hope on the horizon, scientists warned in their careful way that vaccines might not live up to the public’s high expectations. The FDA said a vaccine needed to be just 50 percent effective. The most important thing, scientists told me, was that the vaccines at least protect against severe illness. Then, in the fall, data from the Pfizer and Moderna vaccine trials demonstrated 95 percent and 94 percent efficacy, respectively, against all symptomatic infections. They smashed expectations and created new ones. In comparison, the results from other vaccine trials look pretty good but unspectacular: AstraZeneca’s vaccine looks to be 70 percent effective; Novavax’s achieved 89 percent efficacy in the U.K., but only 49 percent in South Africa, based on data released yesterday; and Johnson & Johnson’s demonstrated 66 percent efficacy against moderate and severe infection, based on results r

New yorkUnited statesSouth africaKelly mooreNew york timesImmunization action coalitionUniversity of floridaNatalie deanCovid 19 vaccinePercent effectiveVaccine trialsPercent efficacyNew variant of the coronavirusAstrazenecas vaccineDifferent trialsSevere illness