Thanks to Lucie Lecomte for this very interesting report in Bendibao.com: Hong Kong H7N9 avian influenza is no evidence that the source of infection in Shenzhen. Excerpt from a Google translation:
Up to now, the Guangdong Province and Hong Kong reported a total of three cases of human infection with the H7N9 cases. In terms of current prevention and control of H7N9 in Shenzhen and Hong Kong have interactive, Hong Kong and Macao to establish joint prevention and control system. CDC experts said, the winter comes, can not exclude the possibility of human infection of H7N9 avian influenza in the Mainland of China sporadic cases continue to occur.
August 10, the Guangdong Provincial Health Department confirmed the first case of human infection with H7N9 avian influenza. The 51-year-old Chen Moumou, market towns in Boluo poultry slaughter market work. Week due to fever, August 3 to Huizhou Central People's Hospital for treatment, go to the evening of 9 August, Guangzhou Institute of Respiratory Diseases, First Affiliated Hospital of Medical College. After Moumou cured.
November 5, Guangdong Province, informed the second case of human infection with H7N9 avian influenza. Children 3 years, 5 months, living in Changping Town, Dongguan City, Yuan Shan Pui Village. Children with no fever, mild, stable condition.
Hong Kong SAR Government Secretary for Food and Health Ko Wing Man 2 evening confirmed that Hong Kong confirmed the first case of human infection with H7N9 avian influenza cases, patients being treated in hospital. According to an influenza pandemic contingency plan in Hong Kong alert level has been raised to a serious level. The patient was an Indian commission, November 17 went to Shenzhen slaughter chickens for cooking, which is currently in critical condition. Ko Wing Man that since only one case temporarily, but patients also have a clear history of its classified as imported cases.
At present no evidence that the source of infection in Shenzhen Currently the Hong Kong SAR Government has decided to suspend the supply of live chickens to Hong Kong, Shenzhen three registered farms. Mahan Wu, deputy director of Shenzhen Center for Disease Control said there is no evidence that patients infected with H7N9 in Hong Kong in Shenzhen source of infection. As the winter migratory birds frequent source of infection is difficult to determine whether or migratory birds carrying the virus in poultry sold in the market. Relevant results remains to be investigated.
November this year, the state will H7N9 bird flu prevention and control system into the B infectious. The city through high-risk groups for investigation and influenza-like illness surveillance systems to strengthen the prevention and control of avian influenza H7N9. As of November 7, the city's investigation of 59 cases of patients with severe pneumonia, occupational health patients, 526 cases of high-risk population that is engaged in poultry farming, wholesale and sale. From the current perspective nucleic H7N9 test results are negative. Up to now, the city has not yet found people infected with H7N9 avian influenza.
"Although Shenzhen has yet to appear cases of human infection with H7N9, but sporadic cases appear risky." CDC experts said, first of all, the neighboring provinces of Guangdong, Hunan, Jiangxi, and the city's surrounding cities of Huizhou, Dongguan and Hong Kong have been infections have appeared in the meantime, from Dongguan to monitor the H7N9 virus inside chicken. Secondly, Shenzhen poultry demand for larger, are from neighboring provinces, poultry, agricultural and other sales and transportation, to a certain extent, increased risk of infection. Finally, Shenzhen is located in the main migratory route, now is the migratory season, with the potential risk of spread of the epidemic.
We know H7N9 is very rarely found in poultry even when people are searching for it, so the absence of evidence in this case is not evidence of absence. The Indonesian case may have simply been extremely unlucky to buy an infected bird (which would have looked perfectly healthy).