I worked with a vet, old and-time experienced, at a vaccination clinic, mostly for cats. When I asked him if it was worth getting the feline leukaemia shots for my cats. He looked me in the eye and said, "Don't you think if they had one that works for children instead of letting children die of it they'd use it!" That is not a direct quote, but you get the drift and the way he presented his view was spot on.It sounds as though they have made some progress. I would not give to my pets nor kids.