(It's what Jenner used in 1798, The very word "Vaccination" comes from cow "vacca" in Latin)
I don't think we should publicize the progress we are making towards increased vaccine availability-because we may put Iraq in a use-it-or-lose it scenario.
I believe the vaccine will be shown (or already has been shown) to be effective at a 10:1 dilution.
It is an interesting exercise in human psychology, though, to wonder how we could simultaneously a) Permit retention of variola by the USA and USSR in recognition of its role as a bioweapon, and, b) Stop vaccination because variola had been "eliminated".