Dual action provides an extra layer of protection against borrelia
burgdorferi infection in dogs. Combines two strains of B.
burgdorferi for optimal effectiveness. Strain 1 is a B. burgdorferi
traditional isolate that stimulates production of borreliacidal
antibodies to outer surface protein A (OspA). Strain 2 is an unique
isolate that stimulates production of borreliacidal antibodies
to outer surface protein C (OspC).