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That's not a bad source at all for general information. I'm surprised it doesn't mention greenish diarrhea because I've come across a lot of sources that do mention it, but it may be a strain-dependent symptom that isn't commonly seen in the US. It's hard to say. I usually try to look at...

I am not a veterinarian, but Newcastle Disease feels like a strong contender based on your description, your general location, and the mortality rate you are experiencing. You may know Newcastle disease as Ranikhet disease - same thing, different name. Newcastle Disease (aka Ranikhet disease)...