Workers wear protective clothing at the Bernard Matthews farm in Holton, Suffolk, where thousands of turkeys are being culled after an outbreak of the H5N1 strain of bird flu.
A three-kilometre protection zone and a 10km surveillance zone have been set up around the farm, which is south-west of Lowestoft.
The H5N1 virus can be fatal if passed on to humans but health experts have said that risk is "very low". Experts say the source could have been wild birds.
A total of 2,000 staff work at the Bernard Matthews site in Holton and 100 of those have been given the Tamiflu anti-viral drug.
Government vets spent Saturday night and Sunday gassing birds at the Suffolk farm. The virus has so far been detected in only one shed out of 22.
A spokesman for the Bernard Matthews company said none of the affected birds had entered the food chain and there was no risk to public health.
The bird carcasses are being transported in sealed lorries for destruction at a plant in Cheddleton, Staffordshire.
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