I've said this before, but I'll say it again... There is no way for any agency to know about the prevalence of blackhead unless necropsies have performed on *all* deceased chickens, peafowl, turkeys, gamebirds, etc. I say better safe than sorry, so assume it's on your property if you have chickens and stock up on the medication needed for control and treatment.
I can almost guarantee you that if I call the three nearest county extensions (Santa Clara, San Benito and Monterey) and The California Animal Health and Food Safety (CAHFS) Laboratory System at UC Davis that none of them will have this info.
Another thing... Did you know that poultry can get blackhead through a means called "cloacal drinking"?
Source: http://www.poultrymed.com/ftp/pub/flagellated.pdf
"Cloacal drinking is the reflexive intake of fluids through the cloaca in order to inoculate the young bird’s immune system with the microbial flora of the surrounding environment."
Bottom line, if you have chickens and turkeys or peafowl you should also have a wormer like Safeguard or Valbazen and metronidazole.
-Kathy
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