I think it can spread through a flock in a matter of hours.
I am ignorant as to why no vaccine is yet effective. Chickens kept having heart attacks and strokes from blood clots.
Founder
Ancient Order of the 1895 Winchester
"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."
WS
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