I would ask your Vet. what he/she recommmends, for your area. Personally, what I cant get at my local CO-OP, I purchase through "Jeffers Livestock" You can get free catalog by calling 1-800-JEFFERS or on-line at JeffersLivestock.com I have had continuous excellent service from them. The Pasteurella (combo) vaccines are with the other 4 way and 5 way respiratory vaccines.............each manufacturer spells their products out very well, just a matter of reading. I would ask your vet what they recommend, what's best for your area, that's where I always get my questions answered. If they (Vet) cant sell you teh vaccine, your local CO-OP may or as I said I buy alot of my Biologicals and supplies through Jeffers. Good luck!