September 24, 2021

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How protective is the COVID-19 vaccine against Delta variants?

How protective is the COVID-19 vaccine against Delta variants?

How protective is the COVID-19 vaccine against Delta variants?



How protective is the COVID-19 vaccine against Delta variants? The US Centers for Disease Control and Prevention has given the answer: The death rate of the unvaccinated population is 11 times that of the vaccinated population!

 

Introduction:

As the new coronavirus delta swept the world, countries began to question: Does the previously vaccinated COVID-19 vaccine really protect the mutant virus? However, according to data, many people vaccinated with the COVID-19 vaccine are still infected with the delta mutant virus. Recently, the US Centers for Disease Control and Prevention has launched an analysis and exploration of this issue…

On the 7th local time, WHO released the weekly epidemiological report of COVID-19 pneumonia. Last week (August 30 to September 5), the number of new confirmed cases of COVID-19 pneumonia worldwide exceeded 4.47 million, except for the number of new cases in the Americas. Increased, and the number of new cases in other regions decreased. There were nearly 68,000 new deaths, which was similar to the previous week.

The Americas and European regions saw a significant increase in new deaths last week, while new deaths in other regions all declined. The five countries that reported the most cases last week were the United States, India, the United Kingdom, Iran, and Brazil. So far, 174 countries and regions have been infected with the Delta strain.

How protective is the COVID-19 vaccine against Delta variants?

A new study released by the United States on Friday shows that even when the non-infectious delta virus sweeps the country, the COVID-19 vaccine is still very effective for hospitalization and death.

A study in the United States followed more than 600,000 COVID-19 patients in 13 states from April to mid-July for about three and a half years. According to the US Centers for Disease Control and Prevention, as the Delta virus surged in early summer:

  • People who have not been vaccinated are 4.5 times more likely to be infected with the virus than those who are fully vaccinated;
  • People who have not been vaccinated are more than 10 times more likely to be hospitalized than fully vaccinated;
  • People who have not been vaccinated are 11 times more likely to die than those who are fully vaccinated.

Dr. Rochelle Walensky, director of the US Centers for Disease Control and Prevention, said at a White House press conference on Friday: “Vaccinations are effective. The bottom line is: We have the necessary technological means to reverse this pandemic.”

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But as earlier data showed, the protection against coronavirus infection is declining: the study found that the protection capacity in spring was 91%, while the protection capacity in June and July was 78%.

In June and July, fully vaccinated so-called “breakthrough” cases accounted for 14% of hospitalizations and 16% of deaths. These proportions are about twice the rate from earlier this year.

The rise in this proportion is not surprising: no one says that vaccines are perfect, and health experts warn that as more Americans get vaccinated, they will naturally account for a larger proportion of cases.

Walensky said on Friday that more than 90% of COVID-19 patients in US hospitals have not been vaccinated.

The US Centers for Disease Control and Prevention announced two other studies, showing that the protective effect of the COVID-19 vaccine on the elderly is waning. A study examined hospitalized cases of COVID-19 in 9 states this summer and found that the protection rate for people 75 years and older was 76%, and the protection rate for all other adults was 89%. In the 5 Veterans Affairs Medical Centers, the protection rate for people aged 18 to 64 against hospitalization for COVID-19 is 95%, while the protection rate for people 65 years and older is 80%.

It is still unclear whether the changes over time are due to the reduced immunity of people when they were first vaccinated a few months ago, and the vaccine’s resistance to the mutated virus is not so strong; or whether it is because the U.S. Masks and other preventive measures have been abandoned in most areas.

But US health authorities will consider the latest real data to determine whether at least some Americans need boosters and how long after the last injection. Next week, US Food and Drug Administration consultants will openly discuss whether it is necessary to vaccinate citizens with a third dose of Pfizer vaccine.

(source:internet, reference only)


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