Lyme disease vaccine 70 percent effective: Pfizer

The Hill
by Ashleigh Fields
March 23, 2026
3 min read

Quick Insights

The Bottom Line

Pfizer and Valneva's jointly developed Lyme disease vaccine showed 70 percent effectiveness, potentially becoming the first U.S. vaccine against the disease.

How This Affects You

If FDA-approved, you would gain access to the first Lyme disease vaccine available to the general U.S. population, offering protection against a tick-borne illness affecting millions of Americans.

AI Summary

Pfizer and Valneva announced their jointly developed Lyme disease vaccine demonstrated 70 percent effectiveness in a phase 3 clinical trial, according to the companies' review of the results. If approved by regulatory authorities, this would become the first vaccine available to the general U.S. population against Lyme disease, which is transmitted by infected ticks and can cause joint pain, neurological problems, and cardiac complications if left untreated. The vaccine addresses a significant public health gap, as Lyme disease cases have risen substantially across the northeastern and midwestern United States over the past two decades. Regulatory approval from the FDA would likely determine when the vaccine becomes available to patients, with the companies presumably planning to seek authorization in the coming months. The development comes as tick-borne illnesses have become a growing concern for millions of Americans in endemic regions.

What's Being Done

Pfizer and Valneva announced positive Phase 3 trial results and are presumably seeking FDA regulatory approval for their Lyme disease vaccine.

Should this be getting more attention?

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