I think I've answered something on these lines on another thread, but I'm going to give my same opinion on this one too! I have a lot of breeding experience - helping to raise 11 litters, however, I have only bred 1 of those litters myself, in my own rights as a 'breeder'. So whether I count in your 'experienced breeders' criteria I don't know. However, I did use the CHV vaccine on my bitch. I have no idea whether she has been exposed to CHV, which as someone else has pointed out is not solely a STD (that is just a very minor way of transmission from what I can make out), it is of a similar form to kennel cough ... and evidence implies that the vast majority of dogs are thought to have been exposed to CHV at some point in their lives.
Something on the lines of a kennel cough type infection caused catastrophic results to my breeding programme the previous year. So when my bitch was mated in 2010 she had the CHV vaccine to ensure that I was doing everything possible to ensure things went well. She went on to produce an extremely fit and healthy litter of 6 pups.
Interestingly, an experienced breeder (of over 40 years experience) also experienced the same infection throughout her dogs the previous year as mine had. She did not give her bitch who also whelped in 2010 the CHV jab as she didn't feel it necessary and she didn't have a rosy birthing. She lost 2 of the pups from her litter, in the first few days. This is the first time she has ever experienced loss of pups, at any time in all those years.
I have absolutely no scientific proof/evidence that this was due to CHV but it is sufficient proof to me that I did absolutely the right thing in safeguarding my litter. We have no experience of CHV, that we know of, in my lines, there have been no fading puppies, but as said, events dictated to me that I would be bonkers not to use this injection. I have another bitch due to be mated this year, she will also be having the CHV jab.
For me I don't have any answers about what has happened, but I do have the ability to safeguard against things going wrong. From what I have read there are no adverse affects to this vaccination.
I do not routinely inject chemicals into my dogs. If you do a search on this site (in the google box) you will find a lot of information ... this article is particularly good and by someone who has a lot of knowledge on the subject:
http://www.champdogsforum.co.uk/board/topic/71220.html