Sanofi makes this as well as Pentacel and other vaccines that are out of supply. I started a thread about pentacel a while back and there were some links shared by other posters. The jist of the whoke thing seems to be that them vaccines were coming from a plant/lab in Canada and the FDA found some infractions and aren't accepting any vaccines from the place right now. I don't have a link to share and can't even validate this dor sure but that is my ubderstanding.
I found some info on vaccineshoppe.com
Saw on yhere too that apparently Sanofi is foing to stop making the (T) tetanus only vaccine.