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Health News


NATURAL IMMUNITY SUPERIOR TO VACCINATION AGAINST DELTA VIRUS VARIANT: STUDY

By Zachary Stieber
Zachary Stieber
Reporter
Zachary Stieber covers U.S. news and stories relating to the COVID-19 pandemic.
He is based in Maryland.
View profile
Follow
January 19, 2022 Updated: January 19, 2022
biggersmaller
Print

Protection from prior COVID-19 infection was better than the protection from
COVID-19 vaccines against the Delta virus variant, according to a new study
published by the Centers for Disease Control and Prevention (CDC).

Researchers analyzed health records from California and New York that were
entered between May 30 and Nov. 20, 2021. They separated COVID-19 patients into
four groups: unvaccinated with no previous COVID-19 diagnosis, unvaccinated with
a previous COVID-19 infection, vaccinated with no prior COVID-19 infection, and
vaccinated with prior COVID-19 infection.

Those who had not received a COVID-19 vaccine but were infected previously with
the illness were much less likely to test positive for COVID-19 when compared to
vaccinated people who had not gotten COVID-19, according to the study, which was
published Wednesday in the CDC’s Morbidity and Mortality Weekly Report.

People who had not gotten a vaccine but did have a prior infection, also known
as natural immunity, were also less likely to land in a hospital than the
vaccinated without natural immunity, according to hospitalization records from
California.

The unvaccinated without prior infection were by far the most likely to contract
COVID-19 and require hospital care, the study found.

“These results suggest that vaccination protects against COVID-19 and related
hospitalization and that surviving a previous infection protects against a
reinfection. Importantly, infection-derived protection was greater after the
highly transmissible Delta variant became predominant, coinciding with early
declining of vaccine-induced immunity in many persons,” researchers,
including Tomás Leon with the California Department of Public Health, wrote.

Because the time period studied only went through late November, more research
is needed to examine whether vaccination and prior infection protects as well
against the Omicron virus variant, which became dominant in the United States
last month, the researchers said.

They also encouraged people to get vaccinated even if they have natural
immunity, pointing to the finding that the vaccinated with prior infection were
the most protected against infection and hospitalization, according to the
health records.

Experts are divided as to whether the naturally immune should get a jab, with
some noting studies that indicate the protection increases but others
highlighting how the elevation is, in many cases, minimal, and pointing to other
research that suggests side effects are more likely among naturally immune
getting a vaccine.

Limitations of the report include the potential for bias related to unmeasured
confounding and the analysis not including information on the severity of
infection.

Dr. Jeffrey Klausner, a clinical professor of medicine at the Keck School of
Medicine of the University of Southern California who was not involved in the
study, told The Epoch Times in an email that the findings “strongly support the
need to update our vaccination policy, work and school requirements,” with those
who can demonstrate they have natural immunity being given equal access as those
who are vaccinated.

“Vaccination is a much, much, safer pathway to immunity than getting infected,
but in an otherwise healthy person who has recovered, they should have
confidence that they [have] protection against severe disease, hospitalization,
and death,” he added.

The Morbidity and Mortality Weekly Report is a weekly publication from the CDC.
Most studies are not peer-reviewed but the articles are reviewed by CDC
officials before being published and the content, by the time it’s published,
“constitutes the official voice” of the CDC, the agency has said (pdf).




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