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Bird Flu Outbreak Prompts Mexican Cull July 13, 2012
Mexican poultry inspections
Mexican animal health officials examining poultry at a commercial farm in Jalisco in late June 2012.
Officials in Mexico culled 2.5 million chickens in the west of the country in an attempt to contain a bird flu outbreak.

The H7N3 strain of the virus was first detected on June 20 in Jalisco state.

The federal government declared a national animal health emergency on July 2 as the magnitude of the outbreak became apparent.

More than 1 million avian influenza vaccines have been imported from Pakistan, and farming officials say four labs will produce more than 80 million doses of the vaccine in seeds to deliver to farms.

The H7N3 strain is not easily transmitted between people, but world health officials say it has occasionally caused disease in humans in various parts of the world.

Photo: Agriculture Department (Mexico)