What does efficacy mean for the COVID-19 vaccine?
Efficacy refers to how well a vaccine performs under ideal conditions as reflected in a careful clinical trial.
How effective is the Pfizer COVID-19 vaccine?
What is the difference between efficacy and effectiveness of a vaccine?
Efficacy is the degree to which a vaccine prevents disease, and possibly also transmission, under ideal and controlled circumstances – comparing a vaccinated group with a placebo group. Effectiveness meanwhile refers to how well it performs in the real world.
Efficacy can refer to different things. For example, it can refer to how likely a person is to get COVID-19. A 0% efficacy would mean that vaccinated people in the research study were as likely to get COVID-19 as unvaccinated people.
It takes time for your body to build protection after any vaccination. People are considered fully vaccinated two weeks after their second shot of the Pfizer-BioNtech or Moderna COVID-19 vaccine, or two weeks after the single-dose J&J/Janssen COVID-19 vaccine.
The revelation that Rodgers never got vaccinated for COVID-19 came after he tested positive on Nov. 3, causing him to miss the Packers' 13-7 loss at Kansas City. The earliest he could return to the team is Saturday, which would enable him to play Sunday when the Packers host the Seattle Seahawks.
Moderna COVID-19 Vaccine is authorized for use under an Emergency Use Authorization (EUA) for active immunization to prevent coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals 18 years of age and older. For intramuscular injection only.
The Pfizer-BioNTech COVID-19 Vaccine contains messenger RNA (mRNA) which is genetic material. The vaccine contains a synthetic piece of mRNA that instructs cells in the body to make the distinctive "spike" protein of the SARS-CoV-2 virus.
Pfizer-BioNTech has submitted data to FDA supporting the stability of their COVID-19 vaccine when stored for up to one month (31 days) at 2°-8°C (standard refrigerator temperature).
Number of shots: 2 shots, 21 days apart
On December 11, 2020, the FDA issued an Emergency Use Authorization (EUA) for the use of the Pfizer-BioNTech COVID-19 Vaccine. On December 18, 2020, the FDA issued an EUA for the use of the Moderna COVID-19 Vaccine. And on February 27, 2021 the FDA issued an EUA for the use of the Janssen COVID-19 Vaccine.
Pfizer-BioNTech (COMIRNATY) received U.S. Food and Drug Administration (FDA) approval on August 23, 2021, for individuals 16 years of age and older. Once vaccines are approved by the FDA, companies can market the vaccines under brand names. COMIRNATY is the brand name for the Pfizer-BioNTech COVID-19 Vaccine.
The AstraZeneca vaccine is not authorized for use in the U.S., but FDA understands that these AstraZeneca lots, or vaccine made from the lots, will now be exported for use.
If both of you are healthy and feeling well, are practicing social distancing and have had no known exposure to anyone with COVID-19, touching, hugging, kissing, and sex are more likely to be safe.
Based on what we know from similar viruses, some reinfections are expected. We are still learning more about COVID-19.
Vaccines work by stimulating your immune system to produce antibodies, exactly like it would if you were exposed to the disease. After getting vaccinated, you develop immunity to that disease, without having to get the disease first.
COVID-19 is still a risk. Getting a booster shot doesn't guarantee you won't be infected with the coronavirus.
COVID-19 vaccines teach our immune systems how to recognize and fight the virus that causes COVID-19. Sometimes this process can cause symptoms, such as fever.
• If you have a condition or taking medications that weaken your immune system, you may not be fully protected even if you are fully vaccinated. You should continue to take all precautions recommended for unvaccinated people, including wearing a well-fitted mask, until advised otherwise by their healthcare provider.
Dr. Akiko Iwasaki, an immunologist at Yale University, agrees. She told The Journal that fully vaccinated people who have had COVID-19 “are likely to be the last group that really needs the booster because they really had three exposures.”
They're very similar to what happens after the second dose, which is that you do tend to get pain at the injection site, usually just lasts a few days, and usually it's not severe. And then you can get systemic side effects such as fever, fatigue, headache, and again, that usually goes away after a day or two.
Cases of Bell's palsy (acute peripheral facial nerve palsy) were reported following vaccination of participants in the COVID-19 vaccine clinical trials. Available data were insufficient for FDA to conclude that these cases were causally related to vaccination.
If you have had a severe allergic reaction (anaphylaxis) or an immediate allergic reaction, even if it was not severe, to any ingredient in an mRNA COVID-19 vaccine (such as polyethylene glycol), you should not get an mRNA COVID-19 vaccine.
FDA has authorized the emergency use of the Moderna COVID-19 Vaccine in individuals 18 years of age and older.
The most common side effects reported after getting a third shot of an mRNA vaccine, the type made by Moderna and Pfizer, were pain at the injection site, fatigue, muscle pain, headache and fever, followed by chills and nausea.
mRNA – Also known as messenger ribonucleic acid, mRNA is the only active ingredient in the vaccine. The mRNA molecules contain the genetic material that provide instructions for our body on how to make a viral protein that triggers an immune response within our bodies.
In addition, because the mRNA COVID-19 vaccines do not contain eggs or gelatin, persons with allergies to these substances do not have a contraindication or precaution to vaccination.
No. COVID-19 mRNA vaccines do not change or interact with your DNA in any way.
Pfizer Inc. submitted data to the FDA to demonstrate that undiluted, thawed vials of its COVID-19 vaccine are stable at refrigerator temperatures for up to 1 month.
The study found that boosting with a different vaccine is safe, and that boosters increased antibody levels no matter the combination.
Put simply: Not receiving the second vaccine increases your risk of contracting COVID-19.
The number of doses needed depends on which vaccine you receive. To get the most protection:
- Two Pfizer-BioNTech vaccine doses should be given 3 weeks (21 days) apart.
- Two Moderna vaccine doses should be given 1 month (28 days) apart.
- Johnson & Johnsons Jansen (J&J/Janssen) COVID-19 vaccine requires only one dose.
If you receive a vaccine that requires two doses, you should get your second shot as close to the recommended interval as possible. However, your second dose may be given up to 6 weeks (42 days) after the first dose, if necessary.. You should not get the second dose earlier than the recommended interval.
Side effects after your second shot may be more intense than the ones you experienced after your first shot. These side effects are normal signs that your body is building protection and should go away within a few days.