Canine Spectra KC3 has been shown to be effective for the vaccination of healthy dogs 8 weeks of age or older against Bordetella bronchiseptica (B.bronch), canine parainfluenza (CPIV), and canine adenovirus type 2 (CAV2). The duration of immunity has not been determined. For more information regarding efficacy and safety data go to productdata.aphis.usda.gov. See packaging for complete product details.