Studies confirm the effectiveness of vaccines against new strains of corona

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Elaf from Beirut: The Corona epidemic continues to spread in the countries of the world amid panic over its mutations that threaten global health, while studies confirm the effectiveness of approved vaccines against its new strains.

T cells

An American laboratory study showed that an important component of the immune system known as T cells that counter infection from the Corona virus also protects against new strains of concern by undermining the immune protection of antibodies and vaccines.
According to the study conducted by researchers at the National Institute of Allergy and Infectious Diseases at Johns Hopkins University and School of Medicine, T cells play an important additional protective role by preventing the Corona virus from attaching to human cells. Lead author Andrew Reed said: “Our data, along with results from other groups, show that T cells that counteract COVID-19 in people with primary viral strains appear to fully recognize the major new strains detected in the UK and South Africa and Brazil.
This conclusion comes after analyzing the blood of 30 people who recovered from Covid-19, before the emergence of the new, more contagious strains. From these samples, the researchers identified a specific form of T cells that were active in the face of the virus, and studied how they functioned against the new strains.

The study concluded that T-cell protection remained highly effective and could recognize virtually all mutations in the strains studied.


(An elderly Indian patient with COVID-19 is breathing with the help of oxygen)

Two-dose vaccination

While a recent American study revealed that vaccination with two doses is the only way to avoid severe infection with mutated strains of the Corona virus, the British newspaper “Mirror” published a report by Oregon Health and Science University researchers, in which they stressed the importance of the vaccine of any kind, especially for the elderly, because of their weak immune systems. , which makes them safe from the risks of complications from the virus compared to those who do not receive the vaccination. This is according to a study they conducted on 200 participants who received the second dose of the COVID-19 vaccine two weeks ago. They found that those vaccinated in their twenties had seven times stronger antibody responses than those in their 70s and older.


(A medical worker vaccinates a man with a dose of the coronavirus vaccine at Moti Lal Nehru Medical College in Allahabad city)

mutated delta

And two separate British studies indicate a 70 percent reduction in the risk of hospitalization after two doses of any vaccine, for people infected with the “delta” strain of the emerging corona virus. As academics and public health officials in Scotland reported, in a letter published in the medical journal “The Lancet”, “the efficacy of the vaccine against delta-variable infection is lower compared to previous strains of the coronavirus, but the vaccines provide similar levels of protection against severe symptoms of Covid-19.” .

These results indicate that vaccines against Covid-19 are able to protect people from new variants, according to the Wall Street Journal. UK public health officials say they are becoming increasingly confident that vaccines can provide significant protection against the delta mutated variant. “The efficacy of the vaccine against Delta is still very significant,” explained Aziz Sheikh, director of the Usher Institute of Medicine at the University of Edinburgh, and author of one of the two studies.

global health

The World Health Organization indicated that two doses of the Pfizer vaccine reduce – by 79 percent – the risk of infection with the delta variant, which was discovered in India and monitored in 74 countries and increased the number of deaths in the world, compared to 92 percent for the alpha variant, which was first discovered in the United Kingdom.

The study indicates that two doses of the AstraZeneca vaccine provide protection against delta by 60 percent, and 73 percent against alpha.

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