ak, I'd suggest giving your vet a call about this calf. The one in the picture I posted had just been vaccinated with a modified live vaccine and afterwards was showing signs of just about everything I'd vaccinated her for... something I'd heard can happen but had never seen it before. My vet and I decided the lesions in my calf's mouth looked like BVD (bovine viral diarrhea virus) lesions and so just to be on the safe side, I had an ear notch taken to test if she was a BVD-PI calf. Results came back and she's not.
However -- in your case, if the calf hasn't been vaccinated he has no reason to be showing those lesions unless he's infected with BVD, or is a BVD-PI (peristantly infected) calf. Call your vet and tell them you have a suspected BVD-PI calf and have him tested; if he is PI you don't want him around any other cows, and esp not any pregnant cows.
As far as my vaccination schedule, I use a modified live vaccine for BVD, IBR, PI3, and BRSV, a killed vaccine for lepto, and a killed vaccine for the clostridums such as blackleg and redwater. The first time the animals are vaccinated I give a booster in about 4 weeks, and then yearly after that. For my animals I use Bovishield Gold FP 5 VL5 and Ultrabac8.