Fourth H5N1 bird flu centre found in Poland

WARSAW (Reuters) - A fourth centre of H5N1 bird flu virus has been found in central Poland, about 50 km (30 miles) from three sites found last week, chief veterinary officer Ewa Lech said on Saturday.

The emergency services, following a standard procedure, set up a three-km (1.9-mile) safety perimeter around the site.

"The problem is the farm on which the virus was found is a big one, tens of thousands of birds," Lech told Reuters.

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