On Apr. 30, 2020, Valneva and Pfizer announced a collaboration to develop and commercialize Valnevaﾒs Lyme disease vaccine candidate VLA15, which is currently in Phase 2 clinical studies. VLA15 is the only active Lyme disease vaccine program in clinical development today, and covers six serotypes that are prevalent in North America and Europe. The investigational multivalent protein subunit vaccine, VLA15, targets the outer surface protein A (OspA) of Borrelia, an established mechanism of action for a Lyme disease vaccine.