Detailed Instructions: Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.
Problem:Paragraph: The government confirmed that the highly virulent H5 strain was detected in birds at a chicken farm in Niigata, where about 40 of them were found dead Monday. Dead ducks at a farm in another prefecture of Aomori also tested H5 positive. Culling of about 310,000 birds began Tuesday at the Niigata farm and will continue through Friday. Workers in hazmat suits dug holes and dumped dead birds in them to contain the spread of virus. About 165,000 ducks in Aomori were also being culled. Officials restricted the movements of poultry and eggs within 3 kilometers (5 miles) of the infected farms. About 60 chicken farms operate in the neighborhood of the affected farm in Niigata, where about half a million chickens are raised. The farm in Aomori and two other neighborhood operators are specializing in French duck known as "Barbarie." Suspected bird flu cases have been found in wild birds in those areas since early November. Environment Minister Koichi Yamamoto told reporters that his ministry is sending experts to the areas for investigation, while raising the caution level to the highest level. The Agricultural Ministry has also dispatched an investigative team to both prefectures. Claim: Highly-contagious bird flu found in Japan, culling start.
Solution:
Japanese health authorities have confirmed a highly contagious avian flu strain in poultry in two prefectures in northern Japan, with culling of hundreds of thousands of birds starting Tuesday at the affected farms.