[ExI] COVID-19 vaccine effectiveness dropped to 66% against delta, CDC finds

John Grigg possiblepaths2050 at gmail.com
Fri Aug 27 04:56:59 UTC 2021

"The *delta variant*
<https://www.livescience.com/coronavirus-variants.html> has
dealt a blow to *COVID-19 vaccine*
which has dropped by about 25 percentage points since the variant became
the dominant strain of coronavirus in the U.S., a new study among
healthcare workers finds.

The study, from the Centers for Disease Control and Prevention (CDC), found
that the vaccines' effectiveness against COVID-19 infections declined from
91% prior to the delta variant's emergence, to 66% after the rise of the
delta variant in the summer.

Despite this "moderate reduction," health officials stressed that "the
sustained two-thirds reduction in infection risk underscores the continued
importance and benefits of COVID-19 vaccination," the authors wrote in the
study, published Tuesday (Aug. 24) in the CDC journal *Morbidity and
Mortality Weekly Report (MMWR)*

The study is based on information from more than 4,000 health care workers
in six U.S. states (Arizona, Florida, Minnesota, Oregon, Texas and Utah),
from mid-December 2020 through mid-August 2021. During the study period
(both before and after the rise of the delta variant), the effectiveness of
COVID-19 vaccines against infection was 80%, the study found.

Eight-three percent of healthcare workers in the study were vaccinated; 65%
had received the Pfizer-BioNTech vaccine, 33% had received the Moderna
vaccine and 2% had received the Johnson & Johnson vaccine."

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