The British government has confirmed that tests on livestock for foot and mouth at a fourth farm have proved negative.
Inspectors cleared animals of foot and mouth on the Surrey farm about 19 km east of a surveillance zone where two farms have tested positive.
Temporary controls around the property were lifted. Tests on a third farm in the area for the disease have also proved negative.
As a result of the outbreak, more than 570 animals have been destroyed and the European Union and individual countries have banned British meat and dairy exports.
