Health
According to the CDC, innate immunity stronger than vaccine alone during delta waves
Denver (KDVR) — A new report from the US Centers for Disease Control and Prevention showed that innate immunity during delta waves was six times stronger than vaccination.
The Report released on January 19th, Analyzed COVID result data from New York and California. It accounts for about one in six deaths from COVID in the United States.
There are limits to this research. That is, it was done before the Omicron wave and does not take into account information about boosters. But that is broadly consistent with research from other countries.
Vaccines were more effective in preventing infections and serious illnesses than innate immunity from previous infections before the Delta variant became the predominant strain. After Delta became the predominant strain, only the vaccine became vulnerable to the virus and the innate immunity became much stronger. Studies have shown that this may be primarily due to the fact that the vaccine began to wear out as the delta spread.
“Importantly, the protection from infection increased after the predominance of the highly contagious delta mutant,” the report reads. “This is consistent with the early decline in vaccine-induced immunity in many people.”
In California, in the week beginning May 30, 2021, the COVID-19 case rate was 19.9 times lower in those who were vaccinated without previous cases and unvaccinated with previous COVID-19 cases. Cases of COVID-19 earlier than among unvaccinated people without previous infection, 7.2 times lower in people with.
It changed on October 3rd, when the Delta variant was the predominant strain. Case rates for previously unvaccinated people who were not previously diagnosed with COVID-19 were only 6.2 times lower than unvaccinated, uninfected people and 3 times less effective than before Delta. They were 29-fold lower among previously diagnosed unvaccinated people and 32.5-fold lower among previously diagnosed and vaccinated people with COVID-19.
Similar numbers came from New York.
This study also tracks the same trends regarding hospitalization. In California, the leap of protection against serious illness was even more dramatic. This indicates that the protection provided by the previous infection was increased 9-fold in the delta wave.
However, the effectiveness of innate immunity by Omicron is not yet fully understood. The CDC warns that both vaccines and innate immunity were reduced with the new dominant mutant.
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