
Have always used Nobivac two course until about 18 months ago when my vet couldn't get his usual manufacturers due to some problem with supply. I had one of my pups get the 3 jabs (don't remember the name of that manufacturer) but my vet is back to the usual now.
So, whether you have 2 or 3 is irrelevant - as long as you are sticking to the same manufacturer for the pups course - they both cover for exactly the same thing.
The Nobivac has parvo included in the second jab.