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Influenza virus H7N9 now detected in southern China increasing risk of cross-border spread
The spread of the H7N9 virus among poultry in live bird markets (LBM) in China's Guangxi Province has significantly increased the risk that it will progressively spread to other neighbouring countries of China, posing an increased human health risk, the United Nation's Food and Agriculture Organization (FAO) warned today.
The virus, which produces no detectable symptoms among infected birds, has seriously disrupted poultry production and markets in 14 provinces of China, as well as Hong Kong SAR and Taiwan Province of China. It has resulted in at least 290 confirmed illnesses with 66 human deaths from animal-to-human transmission. There is no evidence of human-to-human transmission with many human cases being linked to poultry exposure at live bird markets (LBM).
Authorities in China have tracked movement of the infection to live bird markets in Guangxi between 24 and 28 January 2014, where the province's first human casualty was also reported. Guangxi Province shares a border with Viet Nam while its neighbouring province, Yunnan, shares borders with Myanmar, Lao People's Democratic Republic and Viet Nam.
FAO has been working closely with Viet Nam's Department of Animal Health, Ministry of Agriculture and Rural Development, to support H7N9 surveillance in more than 60 LBMs in northern provinces of the country since June 2013. So far, there is no evidence that the virus is present in Viet Nam or any of China's other neighbouring countries in Southeast Asia. But there are indications, based on previous experience with the H5N1 virus, that H7N9 is easily capable of circulating across borders.
Given the current understanding of the way poultry moves between China and neighbouring countries, and in addition to the economic losses suffered by an outbreak, H7N9 presents a serious public health risk when there is close contact between infected poultry and humans, particularly during times of festival such as the recent lunar new year celebrations. The lack of any visible symptoms among infected birds makes early detection more challenging. Therefore it is critical that all of China's neighbouring countries in the sub-region review their emergency preparedness and response plans to effectively address outbreaks of H7N9. "The key issues that need to be considered immediately are the enhancement of ongoing surveillance and a comprehensive risk communication plan to raise awareness of the threat H7N9 poses to both the animal and human health sectors," said Hiroyuki Konuma, FAO's Assistant Director-General and Regional Representative for Asia and the Pacific. "Urgent initiatives are needed to improve biosecurity in live bird markets and a clear response plan to disrupt the transmission cycle of the virus in case of an incursion is also necessary."
FAO has been working closely with its international partners, including the World Health Organization (WHO), the authorities in China and those in a number of other countries in Asia, since the emergence of H7N9 in China early last year and has been responding to the H5N1 virus since 2004. The current situation in Guangxi will require a renewed vigilance to mitigate the effects of cross-border spread. FAO will continue to work with governments and its other partners in that regard.