Pfizer and BioNTech Announce Data Demonstrating High Immune Response Following a Booster Dose of their COVID-19 Vaccine in Children 5 Through 11 Years of Age

  • Data from a subanalysis of 30 sera from a Phase 2/3 clinical trial of children 5 through 11 years of age show a 36-fold increase in SARS-CoV-2 Omicron neutralizing titers following a booster (third) dose of the Pfizer-BioNTech COVID-19 Vaccine
  • In the Phase 2/3 clinical trial with 140 children a booster (third) dose of the Pfizer-BioNTech COVID-19 Vaccine increased neutralizing antibodies by 6-fold against the SARS-CoV-2 wild-type strain in this age group
  • Companies plan to submit these data to U.S. Food and Drug Administration in the coming days with additional submissions to other regulatory agencies worldwide to follow

Pfizer Inc. (NYSE: PFE) and BioNTech SE (Nasdaq: BNTX) today announced positive results from a Phase 2/3 clinical trial evaluating the safety, tolerability and immunogenicity of a 10-µg booster (third) dose of the Pfizer-BioNTech COVID-19 vaccine in healthy children 5 through 11 years of age. These data demonstrate an increase in SARS-CoV-2 Omicron variant and wild-type strain neutralizing titers following a booster dose of the Pfizer-BioNTech COVID-19 vaccine compared to two doses. These data reinforce the potential function of a third dose of the vaccine in maintaining high levels of protection against the virus in this age group.

The Pfizer-BioNTech COVID-19 Vaccine, which is based on BioNTech’s proprietary mRNA technology, was developed by both BioNTech and Pfizer. BioNTech is the Marketing Authorization Holder in the United States, the European Union, the United Kingdom, Canada and the holder of emergency use authorizations or equivalents in the United States (jointly with Pfizer) and other countries. Submissions to pursue regulatory approvals in those countries where emergency use authorizations or equivalent were initially granted are planned.

About the Phase 1/2/3 Trial in Children

The Phase 1/2/3 trial initially enrolled up to 4,500 children ages 6 months to under 12 years of age in the United States, Finland, Poland, and Spain from more than 90 clinical trial sites. Additional children have been enrolled in all age groups following study amendments and the trial currently includes more than 10,000 children. The trial was originally designed to evaluate the safety, tolerability, and immunogenicity of the Pfizer BioNTech vaccine on a two-dose schedule (approximately 21 days apart) in three age groups: ages 5 to under 12 years; ages 2 to under 5 years; and ages 6 months to under 2 years. Based on the Phase 1 dose-escalation portion of the trial, children ages 5 to under 12 years received a two-dose schedule of 10 µg each while children under age 5 received a lower 3 µg dose for each injection in the Phase 2/3 study. The trial enrolled children with or without prior evidence of SARS-CoV-2 infection. In December 2021, Pfizer and BioNTech announced the companies would test a third 3 µg dose given at least two months after the second dose in children under age 5 and a third dose of the 10 µg formulation in children 5 to under 12 years of age.

About the Pfizer-BioNTech Laboratory Study

To evaluate the effectiveness of a third 10-µg dose in children 5 through 11 years of age, Pfizer and BioNTech tested a panel of 30 human immune sera obtained from the blood of individuals that received two or three 10-µg doses of the current Pfizer-BioNTech COVID-19 Vaccine, using a live SARS-CoV-2 recombinant virus fluorescent foci reduction neutralization test (FFRNT). Each serum was tested simultaneously for its neutralizing titer against recombinant SARS-CoV-2 (with USA-WA-1/2020 genetic backbone) bearing the wild-type SARS-CoV-2 spike protein and theOmicron spike. The 50% neutralizing geometric mean titer (GMT) against Omicron was 993 (after three doses), compared to 27 after two doses. The neutralizing GMT against the wild-type virus was 2153 (after three doses), compared to 335 after two doses. Further analysis will assess the persistence of neutralizing titers over time after a booster dose of the Pfizer-BioNTech COVID-19 Vaccine against the Omicron and wild-type strains.
About Pfizer: Breakthroughs That Change Patients’ Lives

At Pfizer, we apply science and our global resources to bring therapies to people that extend and significantly improve their lives. We strive to set the standard for quality, safety and value in the discovery, development and manufacture of health care products, including innovative medicines and vaccines. Every day, Pfizer colleagues work across developed and emerging markets to advance wellness, prevention, treatments and cures that challenge the most feared diseases of our time. Consistent with our responsibility as one of the world’s premier innovative biopharmaceutical companies, we collaborate with health care providers, governments and local communities to support and expand access to reliable, affordable health care around the world. For more than 170 years, we have worked to make a difference for all who rely on us.
About BioNTech

Biopharmaceutical New Technologies is a next generation immunotherapy company pioneering novel therapies for cancer and other serious diseases. The Company exploits a wide array of computational discovery and therapeutic drug platforms for the rapid development of novel biopharmaceuticals. Its broad portfolio of oncology product candidates includes individualized and off-the-shelf mRNA-based therapies, innovative chimeric antigen receptor T cells, bi-specific checkpoint immuno-modulators, targeted cancer antibodies and small molecules. Based on its deep expertise in mRNA vaccine development and in-house manufacturing capabilities, BioNTech and its collaborators are developing multiple mRNA vaccine candidates for a range of infectious diseases alongside its diverse oncology pipeline. BioNTech has established a broad set of relationships with multiple global pharmaceutical collaborators, including Genmab, Sanofi, Bayer Animal Health, Genentech, a member of the Roche Group, Regeneron, Genevant, Fosun Pharma, and Pfizer.

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