From: http://online.wsj.com/article/SB126326011266225669.html

Excerpt:
PENNSYLVANIA DUTCH COUNTRY — Nestled in and around this scenic agricultural belt are secret facilities that don’t take kindly to visitors.

“Keep Out” reads a sign near the gated entrance at one site. Some of the stark, windowless warehouses require electronic pin codes and hazmat-style jumpsuits to enter. A sign on a metal gate ominously warns that it is a “Disease Control Area.” Trespassers could bring a swift response from police geared up to fight bio-terrorism.

These aren’t government labs, military facilities or weapons plants.

They are egg farms.

At clandestine farms across Pennsylvania, thousands of roosters and hens have been toiling away for months in confidential conditions normally reserved for important government ops. Their mission: Fertilize enough eggs to keep supplies of swine-flu vaccine flowing.