How much time you have depends on the age and health of the turkey and whether it gets a secondary infection like e. Coli or coccidiosis. The disease doesn't "spread over the head", it affects the liver and the cecal pouches. If one has a turkey with something on it's head that's probably fowl pox. Blackhead has nothing to do with the head.Once a turkey contracts blackhead how much time do you have to save them and how long does it take to spread all over it's head???
-Kathy