A recent study from Israel reported a dramatic drop in the efficacy of the Pfizer-BioNTech vaccine for fully vaccinated humans down to around 64%.
Health experts who spoke to the Arizona Daily Star warned that data from the Israeli study should not be considered in isolation.
Both LaBaer and Gerald said other studies still show good efficacy against the delta variant from 80% or more. “It’s a bit of a cup half full, cup half empty,”
Ultimately, experts like Gerald are not worried about mild breakthrough cases. The number of breakthrough cases resulting in hospitalizations and deaths is far more important.
All available COVID-19 vaccines in the United States have been extremely effective in preventing COVID-19 hospitalizations and deaths, even against the Delta variant.
While health experts are not worried about the delta variant, they are concerned about it.
It is much more transferable than any other variant, so it spreads faster.
And it’s more aggressive. It can make you sicker. A recent study from China showed that delta cases had much higher viral loads.
While concerns about the delta variant have increased as details from several studies have emerged, LaBaer said it would be too early to call the Israeli or Chinese studies “red flags”.