From Richard Thomas of Birdlife International:

"Chicken producers gathered in Afyon, the city that meets 20 % of Turkey’s need of eggs, and established a factory that produces organic fertilizers from chicken manure. Established by 9 chicken producers who call themselves the Afyon Union of Forces, the organic fertilizer factory has a daily capacity of 300 tons and is the biggest in Europe."

So, up to 300 tons a day for the last 4-5 months = an awful lot of potentially infected material out there…