Hi, yes I do turkeys for christmas and learnt all about blackhead when mine all died! Basically if you want to keep them with chickens or on ground previously occupied by chickens you need to worm them at 3 weeks old with flubenvet for 7 days, then worm every 3 weeks until 16-18 weeks old, there is no vvaccine to prevent blackhead and no licensed medication for turkeys with blackhead, although a vet will prescribe an anti biotic is doesnt always work, an untreated turkey will die, quickly! any other queries fire away! also look at the turkey club forum, not a busy forum but lots of info on there!