This is one of those 'damned if you do and damned if you don't situations,which i can sympathise with.One of my rabbits is due for her vaccinations in January,and it will likely be the three in one rather than the two,sperated by a few weeks.Vaccines are not always totally safe,either for humans or animals,and reactions can occur which are unpredictable.I spoke to a vet friend of mine who had given about a dozen or so of the combined shots,to see if she knew of any adverse reactions, and she had not had any adverse feedback from owners at that time,so that does give one a bit more confidence.As the member above points out, the risks from the diseases,depending on whereabouts you live and where the animals are kept, can be severe and I will go ahead and have the vaccination done to avoid the possible consequences for her(my rabbit),but I will make sure that she is not having any health issues before the shot.As always,we are trying our best for them,but we don't have a crystal ball unfortunately.