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A fourth swan has tested positive for the H5N1 virus at the Swannery in Dorset.
This report from the BBC.
Fourth swan found with bird flu
Last Updated: Wednesday, 16 January 2008, 13:35 GMT
A fourth swan at a swannery in Dorset has tested positive for the virulent H5N1 strain of bird flu, environment department Defra has said.
Three mute swans found dead last week at the Abbotsbury Swannery also tested positive for the strain of the disease.
Tests have been conducted on birds around the nearby Chesil Beach, as vets try to contain the outbreak.
Culling has been ruled out so far but there are restrictions on movements of captive birds nearby.
Staff monitored
After the outbreak was discovered in birds in late December and early January, all commercial poultry premises in the area were designated for inspection by government officials for signs of the disease.
Acting Chief Veterinary Officer Fred Landeg also urged all bird keepers to remain vigilant.
The outbreak was picked up by routine testing.
The Health Protection Agency has monitored about 12 staff at the swannery for signs of the disease, although the risk of infection is said to be low.
Workers were given a course of Tamiflu tablets as a precaution.
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