Dr. Dalton's second breakthrough discovery was that by inoculating "pure" humans with compatible-blood-type "cure", the vaccine turned them into "cure" humans without the trauma of being turned into a vampire and back again. Within the week, they had enough cure to retire the crossbows and convert captured tranq guns to cure guns. By the end of the month, inside operatives had inoculated the "blood bank," swapped out the new blood substitute for the cure, and was well on the way to permanently turning the tide of the war.
With many scientists "freed," the inevitable discovery that "flashing and splashing" Subsiders turned them back into vampires, which were in turn vulnerable to the cure put the final stake into the heart of the vampire epidemic.
And then the Werewolf Spaceships attacked.