Today, the U.S. Food and Drug Administration amended the emergency use authorization (EUA) for the Pfizer-BioNTech COVID-19 Vaccine to allow for use of a single booster dose, to be administered at least six months after completion of the primary series in:

Comirnaty (COVID-19 Vaccine, mRNA), was approved by the FDA on Aug. 23, for the prevention of COVID-19 caused by SARS-CoV-2 in individuals 16 years of age and older. On Aug. 25, 2021, the FDA received a supplement from Pfizer Inc. to their biologics license application for Comirnaty seeking approval of a single booster dose to be administered approximately six months after completion of the primary vaccination series for individuals 16 years of age and older.


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Safety was evaluated in 306 participants 18 through 55 years of age and 12 participants 65 years of age and older who were followed for an average of over two months. The most commonly reported side effects by the clinical trial participants who received the booster dose of the vaccine were pain, redness and swelling at the injection site, as well as fatigue, headache, muscle or joint pain and chills. Of note, swollen lymph nodes in the underarm were observed more frequently following the booster dose than after the primary two-dose series.

Today, the U.S. Food and Drug Administration took action to expand the use of a booster dose for COVID-19 vaccines in eligible populations. The agency is amending the emergency use authorizations (EUA) for COVID-19 vaccines to allow for the use of a single booster dose as follows:

To support the authorization for emergency use of a single booster dose of the Moderna COVID-19 Vaccine, the FDA analyzed immune response data from 149 participants 18 years of age and older from the original clinical studies who received a booster dose at least 6 months after their second dose and compared it to the immune responses of 1,055 study participants after completing their two-dose series. The antibody response of the 149 participants against SARS-CoV-2 virus 29 days after a booster dose of the vaccine demonstrated a booster response.

Safety was evaluated in 171 participants 18 years of age and older who were followed for an average of approximately six months. The most commonly reported side effects by the clinical trial participants who received the booster dose of the vaccine were pain at the injection site, tiredness, headache, muscle and/or joint pain, chills, swollen lymph nodes in same arm as the injection, nausea and vomiting, and fever. Of note, swollen lymph nodes in the underarm were observed more frequently following the booster dose than after the primary two-dose series.

The Moderna COVID-19 single booster dose is half of the dose that is administered for a primary series dose and is administered at least six months after completion of a primary series of the vaccine.

A single booster dose of any of the available COVID-19 vaccines may be administered as a heterologous booster dose following completion of primary vaccination with a different available COVID-19 vaccine. The eligible population(s) and dosing interval for a heterologous booster dose are the same as those authorized for a booster dose of the vaccine used for primary vaccination.

For example, Janssen COVID-19 Vaccine recipients 18 years of age and older may receive a single booster dose of Janssen COVID-19 Vaccine, Moderna COVID-19 Vaccine (half dose) or Pfizer-BioNTech COVID-19 Vaccine at least two months after receiving their Janssen COVID-19 Vaccine primary vaccination.

In another example, Moderna COVID-19 Vaccine and Pfizer-BioNTech COVID-19 vaccine recipients falling into one of the authorized categories for boosters (65 years of age and older, 18 through 64 years of age at high-risk of severe COVID-19, and 18 through 64 years of age with frequent institutional or occupational exposure to SARS-CoV-2) may receive a booster dose of Moderna COVID-19 Vaccine (half dose), Pfizer-BioNTech COVID-19 Vaccine or Janssen COVID-19 Vaccine at least six months after completing their primary vaccination.

The agency recognizes that health care providers and COVID-19 vaccine recipients will have questions about booster doses. The individual fact sheets for each available vaccine provide relevant information for health care providers and the vaccine recipients. The agency encourages health care providers to also follow the recommendations that will be provided by the CDC following a meeting of their Advisory Committee on Immunization Practices and formal recommendations signed by the CDC director.

Background:  On July 30, 2021, the administration of a third (booster) dose of the BNT162b2 messenger RNA vaccine (Pfizer-BioNTech) was approved in Israel for persons who were 60 years of age or older and who had received a second dose of vaccine at least 5 months earlier. Data are needed regarding the effect of the booster dose on the rate of confirmed coronavirus 2019 disease (Covid-19) and the rate of severe illness.

Methods:  We extracted data for the period from July 30 through August 31, 2021, from the Israeli Ministry of Health database regarding 1,137,804 persons who were 60 years of age or older and had been fully vaccinated (i.e., had received two doses of BNT162b2) at least 5 months earlier. In the primary analysis, we compared the rate of confirmed Covid-19 and the rate of severe illness between those who had received a booster injection at least 12 days earlier (booster group) and those who had not received a booster injection (nonbooster group). In a secondary analysis, we evaluated the rate of infection 4 to 6 days after the booster dose as compared with the rate at least 12 days after the booster. In all the analyses, we used Poisson regression after adjusting for possible confounding factors.

Results:  At least 12 days after the booster dose, the rate of confirmed infection was lower in the booster group than in the nonbooster group by a factor of 11.3 (95% confidence interval [CI], 10.4 to 12.3); the rate of severe illness was lower by a factor of 19.5 (95% CI, 12.9 to 29.5). In a secondary analysis, the rate of confirmed infection at least 12 days after vaccination was lower than the rate after 4 to 6 days by a factor of 5.4 (95% CI, 4.8 to 6.1).

Conclusions:  In this study involving participants who were 60 years of age or older and had received two doses of the BNT162b2 vaccine at least 5 months earlier, we found that the rates of confirmed Covid-19 and severe illness were substantially lower among those who received a booster (third) dose of the BNT162b2 vaccine.

Beneficiaries with Medicare pay nothing for COVID-19 vaccines or their administration, and there is no applicable copayment, coinsurance or deductible. In addition, thanks to the American Rescue Plan Act of 2021 (ARP), nearly all Medicaid and CHIP beneficiaries must receive coverage of COVID-19 vaccines and their administration, without cost-sharing. COVID-19 vaccines and their administration, including boosters, will also be covered without cost-sharing for eligible consumers of most issuers of health insurance in the commercial market. People can visit vaccines.gov (English) or vacunas.gov (Spanish) to search for vaccines nearby.

If you have completed your primary (monovalent) series, plus a single bivalent booster dose, no additional booster is authorized at this time for most individuals (see exceptions below)

People ages 18 years and older who have completed a primary vaccination using any COVID-19vaccine and have not received any previous booster dose(s) may receive a monovalent Novavax booster at least 6 months after completion of the primary series if they are unable (i.e., contraindicated or not available) or unwilling to receive an mRNA vaccine and would otherwise not receive a booster dose.

Studies show after getting vaccinated against COVID-19, protection against the virus and the ability to prevent infection with variants may decrease over time and be less effective against the Omicron variant. However, a booster vaccine dose can increase protection against symptomatic Omicron infection from about 35% to 76%, and can have even higher effectiveness at preventing hospitalizations and death.

No, vaccines reduce the risk of COVID-19, including the risk of severe illness and death among people who are fully vaccinated. While COVID-19 vaccines are effective, studies have shown some decrease in vaccine effectiveness against infection over time. Current vaccines are expected to protect against severe illness, hospitalizations, and deaths due to infection with the Omicron variant. The recent emergence of the Omicron variant further emphasizes the importance of vaccination, boosters, and prevention efforts to protect against COVID-19.

So far, reactions reported after getting the Pfizer-BioNTech or Moderna booster shot were similar to that of the two-shot primary series. Fatigue and pain at the injection site were the most commonly reported side effects, and overall, most side effects were mild to moderate. However, as with the two-shot primary series, serious side effects are rare, but may occur. Similarly, reactions after the second dose of the Janssen vaccine were similar to those experienced with the first dose.

Reactions after getting a COVID-19 vaccine can vary from person to person. Reactions reported after getting a booster shot are like those after the two-dose or single-dose primary shots. Fever, headache, fatigue, and pain at the injection site were the most reported side effects, and overall, most side effects were mild to moderate. Vaccination protects you from severe COVID-19 infection even if you have side effects after vaccination.

Yes, Pfizer-BioNTech COVID-19 should be given as a single booster dose for all individuals aged 12 and older at least 5 months after completion of the Pfizer primary vaccination series. A second booster is recommended for ages 12 and up who are moderately or severely immunocompromised. ff782bc1db

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