NEJM: Two doses of COVID-19 vaccine more effective against Delta Variant

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NEJM: Two doses of COVID-19 vaccine more effective against Delta Variant than just one dose

NEJM: Two doses of COVID-19 vaccine more effective against Delta Variant. Right now, the delta mutant strain is accelerating its spread. A recent study shows that two doses of vaccine are more effective than just one dose.

The study was published on July 21 by the well-known medical journal “New England Journal of Medicine”. The study was carried out in the United Kingdom from April 5 to May 16, 2021, when the main strain of COVID-19 virus circulating in the United Kingdom was shifting from Alpha to Delta. Researchers focused on Pfizer and AstraZeneca vaccines, and compared the vaccine’s effectiveness against these two types of mutant strains.

The results of the study show that with only one dose of vaccine (Pfizer or AstraZeneca), the delta variant strain has a greater impact on the vaccine’s effectiveness. For alpha mutant strains, the effective rate of one dose of vaccination is 48.7%; for delta mutant strains, the effective rate of one dose of vaccination is only 30.7%.

After all two doses of vaccines were vaccinated, the effective rates of the two types of vaccines were significantly improved, and the effective rates were not greatly affected by the delta mutant strain.

For the alpha mutant strain, the effective rate of two doses of Pfizer vaccination was 93.7%; for the delta mutant strain, the effective rate of two doses of Pfizer vaccination was 88%.

AstraZeneca vaccine has an effective rate of 74.5% for the two-dose vaccination against the alpha mutant strain; and 67.0% for the two-dose vaccination against the delta mutant strain.

Right now, the delta mutant strain is accelerating its spread. A recent study shows that two doses of vaccine are more effective than just one dose.

For the alpha mutant strain, the effective rate of two doses of Pfizer vaccination was 93.7%; for the delta mutant strain, the effective rate of two doses of Pfizer vaccination was 88%.

AstraZeneca vaccine has an effective rate of 74.5% for the two-dose vaccination against the alpha mutant strain; and 67.0% for the two-dose vaccination against the delta mutant strain.

Fauci: Unvaccinated Americans are spreading the “Delta” strain

On August 1, Anthony Fauci, the chief medical adviser of the Biden administration, said in an interview that Americans who have not yet received the COVID-19 vaccine are “spreading” the highly contagious “delta” strain.

Fauci said: “In our country, 100 million people who are eligible for vaccination have not been vaccinated. We really have to try to make these people change their minds, make vaccination easier, and persuade them to get vaccinated because they are spreading the epidemic. People.”

The number of new coronavirus infections, hospitalizations and deaths across the United States is on the rise. The “Delta” strain has caused a surge in cases in areas with low vaccination rates. Almost all patients hospitalized with the new coronavirus have not been vaccinated.

In the face of the surge in cases, the US Centers for Disease Control and Prevention (CDC) updated its mask guidelines last week, recommending the reinstatement of the mask order in areas with “large or high transmission” of the new coronavirus, that is, masks must be worn indoors regardless of whether they are vaccinated or not. .

(source:internet, reference only)

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