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Tonix Pharmaceuticals Announces Presentation of Phase 1 Data and Outlines Planned Adaptive Phase 2 Field Study of TNX-4800 for the Prevention of Lyme Disease, at the World Vaccine Congress Washington 2026
TNX-4800 is a long-acting anti-Borrelia burgdorferi OspA human monoclonal antibody in development as a single-dose Lyme prophylactic Phase 1 study of TNX-4800
About this update from Tonix Pharmaceuticals Holding Corp.
[{"type":"text","content":"TNX-4800 is a long-acting anti-Borrelia burgdorferi OspA human monoclonal antibody in development as a single-dose Lyme prophylactic Phase 1 study of TNX-4800 demonstrated safety, tolerability, and pharmacokinetics supportive of approximately four months protection Company expects to initiate a randomized, double-blind, placebo-controlled, adaptive Phase 2 field study in the first half of 2027, pending FDA clearance BERKELEY HEIGHTS, N.J., March 31, 2026 (GLOBE NEWSWIRE) -- Tonix Pharmaceuticals Holding Corp. (Nasdaq: TNXP) (“Tonix” or the “Company”), a fully integrated, commercial biotechnology company, announced Phase 1 data of TNX-4800 (formerly known as mAb 2217LS)1,2 was presented by Mark S. Klempner, MD, professor of medicine at UMass Chan Medical School, an inventor of TNX-4800 and principal investigator of the study, on March 30, 2026, at the World Vaccine Congress Washington 2026. Tonix also announced its planned strategy for an adaptive Phase 2 field study expected to initiate in the first half of 2027, pending FDA clearance. TNX-4800 is a long-acting borreliacidal (or bactericidal), human monoclonal antibody (mAb) with an engineered crystallizable fragment (Fc) domain for an extended half-life that targets the outer surface protein A (OspA) of Borrelia burgdorferi, which causes 99.9% of Lyme disease cases in the U.S.3,4 Tonix is developing TNX-4800, which the Company in-licensed from UMass Chan Medical School in 2025, as a prophylactic that is administered in a single subcutaneous (SC) dose expected to provide approximately four months protection to people in endemic areas during the U.S. tick season. There are currently no marketed U.S. Food and Drug Administration (FDA)-approved vaccines or prophylactics to protect against Lyme disease. “TNX-4800 is expected to provide a preventative option to the 87 million5 people in the United States who are at high risk of contracting the disease because they live, work, or vacation in a tick-endemic area,” said Seth Lederman, MD, Chief Executive Officer of Tonix Pharmaceuticals. “As a monoclonal antibody, we believe TNX-4800 offers significant advantages over vaccines in development. Lyme disease vaccines that elicit antibodies to OspA currently in development take more than six months to offer protection and require complex immunization schedules. A previously approved anti-Os...