Entire flock of 50+ chickens became very weak in matter of few days.

[U_Stormcrow]

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 multiple sources, but the two that I usually turn to for disease information are MerckVetManual.com and PoultryDVM.com.

Their pages on Newcastle Disease:
https://www.merckvetmanual.com/poul...virus-infections/newcastle-disease-in-poultry
http://www.poultrydvm.com/condition/newcastle-disease

Newcastle also has a decent wikipedia page: https://en.wikipedia.org/wiki/Virulent_Newcastle_disease

And has an entry in USDA APHIS because it is a reportable disease here:
https://www.aphis.usda.gov/aphis/ou...erence-Guide/Poultry/Exotic-Newcastle-disease


Of course, it's impossible to say that these birds do or don't have Newcastle (or any other disease) without testing. Symptoms aren't always disease-specific and it can be hard to find somewhere that will do the testing needed. That's always the thing that frustrates me the most about poultry diseases.

Thank you. I frequently use Mark d v m when I have a specific disease in mind. Should have thought of that. Very kind of you to link all those resources. I will update my bookmarks. Thanks again!