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By XU WEI xuwei@chinadaily.儲存com.cn The discovery of the H7N9 bird flu virus in live chickens exported to Hong Kong from a poultry farm in Guangdong province is an isolated case, the provincial quarantine authority said on Tuesday after it re-examined the farm’s chickens. The Hong Kong Special Administrative Region government announced on Monday that it will suspend imports of live poultry from the Chinese mainland for 21 days starting on Tuesday. The announcement came after the H7N9 bird flu virus was discovered in a batch of live chickens exported from a farm in Shunde, Guangdong province. Last year, the farm exported 300,000 live chickens to Hong Kong. The quarantine authority has begun culling 20,000 live chickens at Cheung Sha Wan, the sole wholesale poultry market in Hong Kong. Ko Wing-man, secretary for food and health for the Hong Kong government, urged mainland authorities to help trace the source of the virus. On Tuesday, the Guangdong Entry-Exit Inspection and Quarantine Bureau responded by saying that it tested a larger sample of live chickens from the farm and concluded that the virus found was an “individual case” and was limited to one batch of chickens. “All the test results are negative for the virus. After other investigations, the 迷你倉arm has not found an endemic situation of the H7N9 virus in the farm,” it said in a news statement. The infected batch of live chickens was quarantined before being shipped to Hong Kong, it said. The bureau said it will make further investigations with Hong Kong authorities into the source of the virus and will continue supervising poultry farms during the 21-day suspension of exports. Ko said the H7N9 virus discovery in the Shunde chicken is the first confirmed case in an imported chicken since April when an H7 gene test was introduced. Despite the suspension of live chicken exports, Luo Wei, deputy head of the animal quarantine department of the Shenzhen Entry-Exit Inspection and Quarantine Bureau, said it will continue its quarantine on chicken farms registered for Hong Kong exports. Shenzhen currently has two chicken farms that supply chickens to Hong Kong. “We need to make sure that all live chickens are safe when exports resume,” he said. Luo said the prevention of an H7N9 virus epidemic is difficult. Guangdong is a major source of live poultry to the Hong Kong and Macao special administrative regions. The 36 farms in the province supplied 6.5 million live birds, or 80 percent of the mainland total supply, to the two regions last year. self storage