As a vet tech in charge of ordering, yes, Purevax is 6 times the cost of the adjuvented vaccines. It has been around at least since 2000 when I moved to my present practice. I think it was introduced mid to late '90's. In the 13 years since I joined this practice, the only fibrosarcoma we have seen was around a microchip. However, not all fibrosarcomas are vaccine induced. For instance, I have a friend whose cat had FS on it's nose. For sure no one vaccinated it there.