Pfizer Vaccine Efficacy, Price, Side Effects, Dose Gap

On December 11, 2020, the COVID-19 vaccine, developed by Pfizer-BioNTech, was approved for emergency use in anyone aged 16 and above. It’s an mRNA vaccine in the same vein as the Moderna vaccine. In the United States, it was the first COVID-19 Pfizer vaccine approved for emergency use. To learn more, read the article.

Pfizer Vaccine

Pfizer is a vaccination that uses messenger RNA (mRNA). This vaccination makes your body’s cells generate the coronavirus’s unique spike protein via a genetic code called RNA.
The spike protein then acts as a danger to your immune system cells, which begin to mount an immunological reaction against it. The RNA from the vaccination does not affect your DNA and is destroyed by your body.

In two doses, Pfizer’s vaccine stimulates the body to produce the spike protein specific to this virus. This information will be by your immune system, which creates an immunological response, including antibodies. Pfizer does not contain a live virus and cannot provide you with COVID-19.

Pfizer Vaccine Efficacy

Efficacy measures how effectively a vaccination works in a controlled context with a specific population.
The vaccine’s efficacy in the real world may be lower for various reasons, but this is not a comment on the vaccination. In a “real-world” scenario, the vaccination was there to prevent transmissions by roughly 90%, including those that were asymptomatic.
Another reason why real-world efficacy may vary from clinical trial outcomes is this. Clinical studies only reveal what is happening with the virus at that particular moment. The virus’s frequency may have altered when the vaccine was available to the general public, and new variations may be present. It is very typical and to expect.

There are currently no vaccinations that can entirely prevent transmission. It is why handwashing, wearing a mask, and practicing social separation is still necessary.
The Pfizer vaccination takes two doses, spaced 21 days apart, to be completely effective. Despite this, the vaccine has proved to have a high effectiveness rate of up to 85% after a single dosage.
Many transmissions occur after the first dosage before the body produces enough antibodies to prevent infection during the first ten days following vaccination.

PHE did a reanalysis of research on the effectiveness of the Pfizer vaccine that appeared in the New England Journal of Medicine. According to the PHE reanalysis, this vaccine showed an effectiveness rate of 89 percent for days 15 to 21 following dosage one and before the second dose on day 21, as indicated in Table 1. In this research, the range was 52 percent to 97 percent.
Up to the first week following the second dosage, protection from the first dose had increased to 91 percent, with a range of 74 percent to 97 percent.

Pfizer Vaccine
Pfizer Vaccine

Pfizer Vaccine Price

According to reports, the Pfizer-BioNTech COVID-19 vaccine might cost less than $10 in India, or Rs 730. According to media reports, a source claimed, “It’s a single-digit price per dosage.” “The government’s vaccination program is offered at a non-profit charge.” This vaccine costs approximately half as much as Pfizer’s in industrialized markets such as the United States, the United Kingdom, and Europe. The pricing above might potentially be the world’s lowest for the mRNA-based COVID-19 vaccination.
The Pfizer COVID vaccination costs $19.5 (Rs 1,423) per dose in the United States and roughly $21 in the United Kingdom (Rs 1,532). Pfizer’s pricing in the European Union was approximately $18.9 per dosage before, but price discussions for a higher price of $23.2 (Rs 1,693) per dose are ongoing. As a result, Pfizer’s COVID-19 vaccine might be among the cheapest in the world in India.

Pfizer Vaccines Side Effects

Pfizer’s adverse effects may fall into two categories:

Common Side Effects

  • You may have some transitory adverse effects after getting Pfizer, like any vaccination. These are signs your immune system is functioning correctly.
  • Injection site discomfort or swelling, as well as fatigue, are common adverse effects following Pfizer.
  • Muscle or joint discomfort may cause headaches.
  • Fever and chills are common symptoms.
  • The majority of patients have minor symptoms and recover quickly.
  • Men under 30 are more likely to die within ten days after receiving the second immunization dose.

Rare Side effects

  • In young persons, myocarditis or pericarditis may occur.
  • Myocarditis and pericarditis may occur in rare circumstances following Pfizer immunization.
  • If you have any of the following symptoms after receiving a Pfizer immunization, see a doctor or go to the hospital right away:
  • Shortness of breath pain while inhaling chest pain pressure or discomfort in the chest irregular, skipped heartbeats or fluttering.’
  • U.S. men tend to have a rate of 10 cases per million after the first dosage and 67 cases per million after the second treatment. The TGA is keeping an eye on the danger in Australia’s population.
  • The danger to children aged 5 to 11 years has yet to be determined. Pfizer’s COVID-19 study did not enroll enough participants to determine the rate of myocarditis and pericarditis. Children aged 5 to 11 worldwide have already received millions of doses of this vaccine without any specific safety concerns.
  • The advantages of immunization exceed the danger of this very uncommon complication, and vaccination should continue for all eligible age groups.

Dose Gap

The Pfizer vaccine requires two doses, given three to six weeks apart, for 12 and over. Unless directed by a medical expert, children aged 5 to 11 years need two doses of Pfizer for children (one-third of the adult dosage), given eight weeks apart. Everyone 16 and older who has received their initial course of COVID-19 vaccination at least three months ago is eligible for a booster dose. After your second dosage or booster, you may not be protected entirely against COVID-19 for 7 to 14 days.


COVID-19 vaccines from Pfizer-BioNTech and Moderna, for example, need two doses. The Johnson & Johnson vaccination, for example, requires one injection. Because the immunological response to the first dosage is so poor, some vaccinations need two doses. The second dosage aids in the strengthening of this immunological response. Keep your COVID-19 immunization record card once you’ve had the vaccine. It can help you remember which vaccination you had and when to get your second dose.

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