VLA15 / Valneva, Pfizer - LARVOL DELTA

Efficacy and Safety of the LB6V Lyme Disease Vaccine Candidate: Results From a Phase 3 Study in Participants ≥5 Years of Age (IDWeek 2026) - No abstract available

Clinical • P3 data • Infectious Disease • Lyme Disease

A second yearly booster dose of the VLA15 Lyme borreliosis vaccine candidate in healthy individuals. (PubMed, Nat Commun) - P2 | "These results further support the paradigm of VLA15 primary vaccination followed by yearly boosting to optimize potential protection against Lyme borreliosis. ( ClinicalTrials.gov: NCT04801420 )."

Clinical • Journal • Inflammatory Arthritis • Lyme Disease

Lessons Unlearned: The Barriers to Lyme Borreliosis Vaccination and the Risk of Repeating History. (PubMed, Vaccines (Basel)) - "VLA15 (now designated PF-07307405), a second-generation recombinant outer surface protein A vaccine, is now at regulatory submission following phase 3 results reported in March 2026. We examine the barriers that led to LYMErix's withdrawal, revisit the evidence that generated and sustained the safety controversy and consider whether the conditions now exist for a different outcome. The lessons for a robust post-marketing surveillance programme extend beyond Lyme borreliosis to broader questions about how modern medicine evaluates vaccine risk, interprets safety signals, and communicates under uncertainty."

Journal • Infectious Disease • Inflammatory Arthritis • Lyme Disease • Rheumatology

VALOR: An Efficacy, Safety, Tolerability, Immunogenicity, and Lot-Consistency Clinical Trial of a 6-Valent OspA-Based Lyme Disease Vaccine (VLA15) (clinicaltrials.gov) - P3 | N=12546 | Completed | Sponsor: Pfizer | Active, not recruiting ➔ Completed

Trial completion • Infectious Disease • Inflammatory Arthritis • Lyme Disease

EXPLORING PREFERENCES FOR LYME DISEASE VACCINES IN THE UNITED STATES: A LATENT CLASS APPROACH (ISPOR 2026) - "Respondents showed a strong preference for being vaccinated against Lyme disease. The importance of vaccine attributes such as efficacy and safety varied across respondents. Tailored communication addressing specific concerns, especially around vaccine side effects, may enhance vaccine acceptance and uptake."

Infectious Disease • Inflammatory Arthritis • Lyme Disease

COMBINING DISCRETE CHOICE EXPERIMENT AND CONTINGENT VALUATION TO ESTIMATE WILLINGNESS-TO-PAY FOR LYME DISEASE VACCINE ATTRIBUTES IN THE UNITED STATES (ISPOR 2026) - "Adults in high-incidence regions place substantial value on having an LD vaccine, regardless of attribute enhancements. These findings underscore the potential market demand and support value-based decision-making for future LD vaccine development."

Infectious Disease • Inflammatory Arthritis • Lyme Disease

A Study to Learn About the Safety, Tolerability, and Immunogenicity of a Fifth Dose of 6-Valent OspA-Based Lyme Disease Vaccine (clinicaltrials.gov) - P3 | N=1712 | Recruiting | Sponsor: Pfizer | Not yet recruiting ➔ Recruiting

Enrollment open • Infectious Disease • Inflammatory Arthritis • Lyme Disease

C4601019: A Study to Learn About Different Dosing Schedules of a Lyme Disease Vaccine in Healthy Adults (clinicaltrials.gov) - P3 | N=207 | Active, not recruiting | Sponsor: Pfizer | Recruiting ➔ Active, not recruiting

Enrollment closed • Infectious Disease • Inflammatory Arthritis • Lyme Disease

A Study to Learn About the Safety, Tolerability, and Immunogenicity of a Fifth Dose of 6-Valent OspA-Based Lyme Disease Vaccine (clinicaltrials.gov) - P3 | N=1712 | Not yet recruiting | Sponsor: Pfizer

New P3 trial • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Safety study of a vaccine to help protect against Lyme disease in healthy children (clinicaltrialsregister.eu) - P3 | N=3646 | Sponsor: Pfizer, Inc.

New P3 trial • Dermatology • Infectious Disease • Inflammatory Arthritis • Lyme Disease

A Phase 2 study to assess the safety and immune responses of VLA15-221, A Vaccine Candidate Against Lyme Borreliosis, In a Healthy Pediatric and Adult Population (clinicaltrialsregister.eu) - P2 | N=625 | Sponsor: Pfizer, Inc.

New P2 trial • Dermatology • Infectious Disease • Inflammatory Arthritis • Lyme Disease • Pediatrics

Protective properties of a candidate C-terminal domain OspA vaccine for prevention of Lyme disease. (PubMed, Vaccine) - "Levels of residual B. burgdorferi s.s. tick colonization were reduced in ticks that fed on VLA15-immunized primates compared to those immunized with full length-OspA ST1 (FL-OspA) at a point when OspA-binding IgG levels were similar. Furthermore, monoclonal antibodies targeting the C-terminal half of OspA, elicited by FL-OspA immunization in primates, were more effective at complement-mediated bactericidal killing in vitro and clearance of spirochetes in ticks versus those directed against other parts of the protein."

Journal • Infectious Disease • Inflammatory Arthritis • Lyme Disease

A human Lyme disease vaccine: two steps forward on the path to prevention. (PubMed, Expert Rev Vaccines) - "Lyme disease has expanded over the previous two decades in both incidence and geographic footprint and is anticipated to continue to increase in the future due to changing climate and human encroachment into wildlife areas. VLA15 is currently in the last stage of clinical development, and if found to be safe and efficacious, may offer an important prophylactic modality for prevention of Lyme disease."

Journal • Review • Infectious Disease • Inflammatory Arthritis • Lyme Disease

C4601019: A Study to Learn About Different Dosing Schedules of a Lyme Disease Vaccine in Healthy Adults (clinicaltrials.gov) - P3 | N=200 | Recruiting | Sponsor: Pfizer | Not yet recruiting ➔ Recruiting

Enrollment open • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Phase 2 Study Of VLA15, A Vaccine Candidate Against Lyme Borreliosis, In A Healthy Pediatric And Adult Study Population (clinicaltrials.gov) - P2 | N=625 | Completed | Sponsor: Pfizer | Active, not recruiting ➔ Completed | Trial completion date: Jan 2026 ➔ Jul 2025

Trial completion • Trial completion date • Inflammatory Arthritis • Lyme Disease • Pediatrics

Immunogenicity and safety of an 18-month booster dose of the VLA15 Lyme borreliosis vaccine candidate after primary immunisation in children, adolescents, and adults in the USA: a randomised, observer-blind, placebo-controlled, phase 2 trial. (PubMed, Lancet Infect Dis) - P2 | "The safety and robust anamnestic immune responses associated with VLA15 boosting support its use as a strategy to increase anti-OspA antibody levels before tick season among children, adolescents, and adults. Forthcoming data after administration of subsequent annual boosters will provide further information about VLA15 antibody persistence and boostability."

Journal • P2 data • Inflammatory Arthritis • Lyme Disease • Pediatrics

A Study to Learn About Different Dosing Schedules of a Lyme Disease Vaccine in Healthy Adults (clinicaltrials.gov) - P3 | N=200 | Not yet recruiting | Sponsor: Pfizer

New P3 trial • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Antibody response and safety through 12 months after booster vaccination with an investigational Lyme disease vaccine in adults: a plain language summary. (PubMed, Curr Med Res Opin) - No abstract available

Journal • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Safety Study of a Vaccine to Help Protect Against Lyme Disease in Healthy Children (clinicaltrials.gov) - P3 | N=3549 | Completed | Sponsor: Pfizer | Active, not recruiting ➔ Completed

Trial completion • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Immunogenicity and safety of different immunisation schedules of the VLA15 Lyme borreliosis vaccine candidate in adults, adolescents, and children: a randomised, observer-blind, placebo-controlled, phase 2 trial. (PubMed, Lancet Infect Dis) - P2 | "These findings confirm previously observed safety and immunogenicity profiles of VLA15 in adults and extend them to children aged 5 years and older and adolescents. The greater immunogenicity of VLA15 among children and adolescents might translate to increased flexibility in the real-world clinical setting."

Journal • P2 data • Inflammatory Arthritis • Lyme Disease

Valneva Reports Preliminary Unaudited 2024 Revenue and Cash and Provides 2025 Outlook (GlobeNewswire) - "Met 2024 growth targets for sales revenue (+13% vs 2023) and total revenues (+10% vs 2023); Key Upcoming Catalysts...Lyme disease Phase 3 first data readout by the end of 2025; Further chikungunya vaccine approvals, including the first endemic country (Brazil) and adolescent label extensions for IXCHIQ in major travel markets; Initiation of Phase 3 pediatric trial of IXCHIQ to support further potential label expansion; Phase 2b efficacy data from Human Challenge Study (CHIM) of tetravalent Shigella vaccine candidate in mid-2025 and launch of pediatric study; Phase 1 results for Zika vaccine candidate in the first half of 2025"

Commercial • New trial • P1 data • P3 data • Chikungunya • Infectious Disease • Lyme Disease

6-Valent, OspA-Based VLA15 Lyme Disease Vaccine Candidate Against Lyme Borreliosis in a Healthy Pediatric and Adult Study Population: A Phase 2 Study Update (IDWeek 2024) - No abstract available

Clinical • P2 data • Infectious Disease • Lyme Disease

Preclinical Evidence for the Protective Capacity of Antibodies Induced by Lyme Vaccine Candidate VLA15 in People. (PubMed, Open Forum Infect Dis) - "Passive transfer of sera from trial participants immunized with VLA15 protected mice from borreliosis in a tick challenge model. This indicates that VLA15 induces functional immune responses in people that can be linked to efficacy in a stringent preclinical model."

Journal • Preclinical • Infectious Disease • Inflammatory Arthritis • Lyme Disease

Immunogenicity and safety of an 18-month booster dose of the VLA15 Lyme borreliosis vaccine candidate after primary immunisation in healthy adults in the USA: results of the booster phase of a randomised, controlled, phase 2 trial. (PubMed, Lancet Infect Dis) - P2 | "A booster dose of VLA15 is safe and induces substantial anamnestic immune responses against all six OspA serotypes. As with previously investigated OspA-based Lyme borreliosis vaccines, waning immune responses were observed with VLA15, and annual boosters might therefore be required."

Journal • P2 data • Infectious Disease • Inflammatory Arthritis • Lyme Disease

VALOR: An Efficacy, Safety, Tolerability, Immunogenicity, and Lot-Consistency Clinical Trial of a 6-Valent OspA-Based Lyme Disease Vaccine (VLA15) (clinicaltrials.gov) - P3 | N=12550 | Active, not recruiting | Sponsor: Pfizer | N=8318 ➔ 12550

Enrollment change • Infectious Disease • Inflammatory Arthritis • Lyme Disease