Hens, turkeys and other captive birds in Britain will have to be kept indoors from December 14 to prevent the spread of bird flu, the government said.
The chief vets for England, Scotland and Wales made the decision after cases were detected among captive and wild birds.
The risk to humans is “very low,” the government said, and should “not affect the consumption of poultry products.”
But the veterinary chiefs said “swift action” was needed.
There are numerous strains of bird flu. Most either do not affect humans, or are not easily caught and spread by humans.
Deaths have been recorded outside of the UK related to some strains, but the H5N8 strain – which makes up the bulk of the UK’s current cases – has not infected any humans worldwide to date, the National Health Service said.
A turkey farm in Norfolk is among those found to have had an outbreak of the H5N8 bird flu strain. The birds will now be slaughtered to prevent the spread.