Does anyone know of a source that lists where diseases are known to be common in the USA? (A visual, like a cell phone coverage area map would be best, but a simple list updated in the last decade would suffice.) I see all the descriptions and treatment/prevention info on diseases and all of them say "take these extra precautions if you are in an area where the disease is known", but I can't find jack on what diseases are known where. The feed store is no help, the guy claims Marek's was wiped out 30 years ago(so he gets unvaccinated chicks), despite half my flock being wiped out by Marek's this year.(lab confirmed) Meanwhile I have a bird showing wild head shaking symptoms that I can only match with Newcastle(or some weird late onset marek's thing, she's 25 weeks old.) and I don't know if it's ever been reported around here.