This has been this way for quite some time.
There hasn't been a difference in the 1 and 3-yr vaccines for as long as I have paid attention to them…
True, but so many pet owners are unaware of this fact.
Genetically Engineered and Modified Live Virus Vaccines;Public Health and Animal Welfare Concerns by Michael W. Fox BVetMed,PhD,DSc.MRCVS
http://www.twobitdog.com/drfox/specialreport_Article.aspx?ID=273f53f4-bcdc-474f-a189-cca1d1a81c38
This article is in the most recent issue of Journal of the American Holistic Veterinary Medical Association Volume 29, Number 1.