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COVID-19: Is the Pfizer-Biontech Vaccine Effective?

Studies show that two doses are effective against the COVID-19 Delta variant in a range of 42 to 96 percent.


There were five times more antibodies against the Delta variant in people ages 18 to 55, and 11 times more antibodies in people aged 65 to 85 after the third dose. To be reviewed by other researchers, the study hasn’t yet been finished.

Since then, Israel has become a leader in implementing the third shot. People over the age of 60 are currently being contacted to schedule an appointment.

Reports indicate that people who were vaccinated in April had a 75 percent protection against infection, whereas protection for those who were vaccinated in January was as low as 16 percent.

“The current vaccines have been widely effective in preventing severe disease, including those identified with current variants of concern,” Smith

It has only recommended three shots for immunocompromised populations, such as organ transplant recipients and cancer patients

COVID-19 and Moderna

The Moderna COVID-19 vaccine appears to be effective against the Delta variant, according to multiple laboratory studies. Moderna is also testing a third dose, similar to the Pfizer-BioNTech vaccine.

First Case Study

It was found that, despite a much lower protection level than the alpha version of the vaccine, Moderna could protect against the Delta variant and other variants that were tested.

Also Read: Get Covid Jab Instead Of Waiting For Experts – Jeremy Hunt

According to the data, which has not yet been peer-reviewed, the vaccine was far more effective at producing antibodies against Delta than it was against beta.

‘As we work to end the pandemic, we must be proactive as the virus evolves,’ he said. They confirm our belief that the Moderna COVID-19 vaccine should remain protective against newly detected variants,” Moderna CEO Stéphane Bancel said in a statement.

There was no mention of the level of effectiveness.

Second study

It was found that Pfizer-vaccine BioNTech’s was 87 percent effective against the Delta variant after one dose, while Moderna’s vaccine was 72 percent effective.

Moderna’s protection after two doses couldn’t be calculated because there weren’t enough data. Not only that, but the study hasn’t undergone peer review.

It was found that even a single dose of either the Moderna or Pfizer-BioNTech vaccine provided “good to excellent” protection against symptomatic infection and severe illness, according to these findings. As a result, two doses may provide even greater protection.

Third case study

Pfizer and Moderna’s mRNA-based vaccines were both 94% to 95% effective in preventing COVID-19 with the Delta variant, according to the results of a small laboratory study conducted by researchers in New York.

Fourth case study

Before the Delta variant became dominant, both the Moderna and Pfizer-BioNTech COVID-19 vaccines were highly effective at preventing infection, according to a preprint study uploaded to medRxiv.

When it comes to the Delta variant, both vaccines appear to be highly effective in preventing death and severe illness.

Also Read: Too Early To Give Covid Vaccine To Children Over The Age Of 12.

Moderna’s efficacy against the Delta Variant


Moderna’s efficacy against symptomatic infection with the Delta variant dropped to around 76 percent in July, while Pfizer-efficacy BioNTech’s dropped to as low as 42 percent.

The Mayo Clinic conducted the study, which included more than 50,000 participants, in several U.S. states.

Those who received the Pfizer-BioNTech or Moderna vaccines earlier this year may benefit from a Moderna booster shot, according to study leader Venky Soundararajan, PhD.

Fifth Study

Pfizer, AstraZeneca, and Moderna were compared against the delta variant based on data from ONS’ COVID-19 Infection Survey. Researchers found that a single dose of Moderna’s vaccine was comparable to or more effective than any single dose of the other vaccines.

This could be due to the fact that those who received Moderna were younger on average, and that the vaccine was more effective in younger individuals, according to researchers.

Sixth Study

The effectiveness of the Pfizer-BioNTech and Moderna vaccines among frontline workers dropped from 91 percent to 66 percent when the Delta variant became prevalent in the United States in July 2021, according to a study.

Pfizer-vaccine BioNTech’s has been found to provide a similar level of protection in most studies, ranging from 66 percent to 95 percent.

J&J’s single-shot COVID-19 vaccine offers limited protection against the Delta variant. Also, according to reports, the company is looking into whether a second shot would increase immunity to the variants.

Case Study 1

Unpublished data from a recent clinical trial showed that the vaccine was 85 percent effective against severe disease, and it provided “strong, persistent” protection against hospitalization and death.

A higher level of “neutralizing antibody activity,” which prevents the virus from infecting healthy cells, was observed with the J&J vaccine against the Delta variant than with the beta.

According to another study, the effectiveness of the Pfizer-BioNTech and AstraZeneca vaccines had declined.

Case study 2

After 29 days, the J&J vaccine neutralized the Delta variant, and protection increased over time.

We’ve seen a steady increase in neutralizing antibody response over the past eight months with the single-shot Johnson & Johnson COVID-19 vaccine. Dr. Mathai Mammen is the global head of Janssen Research & Development at Johnson & Johnson.

Case study 3

BioRxiv reports that J&J’s vaccine is 67 percent effective in protecting against the Delta variant.

In addition, researchers found that the vaccine produced fewer antibodies against the Delta variant than it did against the alpha variant. However, scientists caution that the study only examined 27 people and may not accurately reflect the vaccine’s real-world performance.

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