Pfizer and Valneva’s Lyme Disease Vaccine Candidate Marketing Authorization Application Validated by European Medicines Agency

Pfizer and Valneva’s Lyme Disease Vaccine Candidate Marketing Authorization Application Validated by European Medicines Agency

Submission based on favorable efficacy and safety results from Phase 3 VALOR trial

NEW YORK & LYON, France, August 14, 2026 Pfizer Inc. (NYSE: PFE) and Valneva SE (Nasdaq: VALN; Euronext Paris: VLA) today announced that the European Medicines Agency (EMA) has validated the Marketing Authorization Application (MAA) for PF-07307405, the companies’ 6-valent outer surface protein A (OspA)-based Lyme disease vaccine candidate and will begin its assessment of the application.

The application is based on encouraging efficacy of more than 70% observed in the Phase 3 VALOR “Vaccine Against Lyme for Outdoor Recreationists” clinical trial (NCT05477524), which investigated whether the vaccine candidate, PF-07307405, prevented Lyme disease cases in individuals aged five years and older. The vaccine was well tolerated in the trial, with no safety concerns identified.¹

“I’m proud of the progress we have made with our Lyme disease vaccine candidate and excited about the opportunity to potentially bring the first vaccine of its kind to Europe. I look forward to collaborating with the EMA as this vaccine candidate advances through the review cycle,” said Annaliesa Anderson, Ph.D., Senior Vice President and Chief Vaccines Officer, Pfizer. “Lyme disease remains the most common vector-borne illness in Europe, affecting more than 100,000 people each year. When left untreated, it can lead to serious and potentially long-lasting complications involving the skin, joints, nervous system, and heart. We believe vaccination has the potential to provide an important new layer of protection against this debilitating disease and help people continue to enjoy the outdoors with greater confidence.”

“We would like to thank and congratulate our partner Pfizer for the significant progress achieved towards delivering a potential vaccine solution in the fight against Lyme disease. MAA acceptance represents a major milestone, especially considering that more than 200 million people live in Lyme disease risk areas in Europe,” said Thomas Lingelbach, CEO and Board member of Valneva.

Developed in collaboration between Pfizer and Valneva,²³ the investigational 6-valent OspA-based Lyme disease vaccine has been evaluated for its efficacy, safety, tolerability, immunogenicity, and manufacturing lot consistency.⁴ The companies entered into a collaboration and license agreement in April 2020 for the co-development of PF-07307405 and for Pfizer to exclusively manufacture and commercialize PF-07307405, assuming regulatory success.²³

About Lyme disease vaccine candidate, PF-07307405

There are currently no approved human vaccines for Lyme disease. PF-07307405 is the current Lyme disease vaccine candidate which has advanced the furthest along the clinical development timeline, with two pivotal Phase 3 trials completed. This investigational multivalent protein subunit vaccine uses an established mechanism of action for a Lyme disease vaccine that targets the outer surface protein A (OspA) of Borrelia burgdorferi, the bacteria that cause Lyme disease. When a person is immunized with PF-07307405, their body creates antibodies against six Borrelia OspA serotypes. As the tick feeds on the vaccinated person, these antibodies are ingested by the tick as part of its blood meal. Binding of vaccine-induced antibodies to OspA on Borrelia inside the tick inhibits the bacterium’s ability to leave the tick, preventing it from being transmitted to the human host. The vaccine candidate covers the six most prevalent OspA serotypes expressed by the Borrelia burgdorferi sensu lato species in North America and Europe.

About VALOR

The VALOR trial was a multicenter, placebo-controlled, randomized, observer-blinded trial conducted at sites in areas of high incidence of Lyme disease across the U.S., Canada, and Europe.⁴ 9,437 trial participants aged 5 years and older were randomized 1:1 into two trial groups and received four doses of either PF-07307405 or a saline placebo – one dose administered at months 0, 2, and 5-9, followed by a fourth dose one year later, shortly before the start of the following Lyme disease season (season 2).

About Lyme Disease

Lyme disease is a systemic infection caused by Borrelia burgdorferi sensu lato bacteria that are transmitted to humans by the bite of infected Ixodes ticks.⁴ It is considered the most common vector-borne illness in the Northern Hemisphere.⁵⁶ The U.S. Centers for Disease Control and Prevention (CDC) has estimated that approximately 476,000 people in the U.S. are diagnosed and treated each year and 132,000 cases are reported annually in Europe from countries with surveillance systems.⁷ Early symptoms of Lyme disease (such as a gradually expanding erythematous rash called erythema migrans or other nonspecific symptoms like fatigue, fever, headache, mild stiff neck, muscle and joint pains) are often overlooked or misinterpreted. Left untreated, the disease can disseminate and cause more serious chronic complications affecting the skin, joints (arthritis), the heart (carditis), or the nervous system.⁷⁸ The medical need for vaccination against Lyme disease is steadily increasing as the geographic footprint of the disease widens.⁹

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 over 175 years, we have worked to make a difference for all who rely on us. We routinely post information that may be important to investors on our website at www.Pfizer.com. In addition, to learn more, please visit us on www.Pfizer.com and follow us on X at @Pfizer and @Pfizer News, LinkedIn, YouTube and like us on Facebook at Facebook.com/Pfizer.

About Valneva SE

We are a specialty vaccine company that develops, manufactures, and commercializes prophylactic vaccines for infectious diseases addressing unmet medical needs. We take a highly specialized and targeted approach, applying our deep expertise across multiple vaccine modalities, focused on providing either first-, best- or only-in-class vaccine solutions.

We have a strong track record, having advanced multiple vaccines from early R&D to approvals, and currently market three proprietary travel vaccines. Revenues from our growing commercial business help fuel the continued advancement of our vaccine pipeline. This includes the only Lyme disease vaccine candidate in advanced clinical development, which is partnered with Pfizer, the world’s most clinically advanced Shigella vaccine candidate, as well as vaccine candidates against other global public health threats. More information is available at www.valneva.com.

Pfizer Disclosure Notice

The information contained in this release is as of August 14, 2026. Pfizer assumes no obligation to update forward-looking statements contained in this release as the result of new information or future events or developments.

This release contains forward-looking information about an investigational Lyme disease vaccine candidate, PF-07307405, and a collaboration between Pfizer and Valneva for PF-07307405, including their potential benefits, the results of the Phase 3 VALOR clinical trial and a Marketing Authorization Application (MAA) for PF-07307405 pending with the European Medicines Agency , that involves substantial risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. Risks and uncertainties include, among other things, the uncertainties inherent in research and development,