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#Analysis of recent #scientific #information on #avian #influenza A(#H7N9) virus - 10 February 2017 (@WHO, edited)

  Title : #Analysis of recent #scientific #information on #avian #influenza A(#H7N9) virus - 10 February 2017. Subject : Avian Influenza, ...

19 Jan 2017

#China, #H7N9 #avian #influenza: Why is the #epidemic rising significantly this winter? (Jan. 19 ‘17)

 

Title: #China, #H7N9 #avian #influenza: Why is the #epidemic rising significantly this winter?

Subject: Avian Influenza, H7N9 subtype, poultry epizootics and human epidemic in China.

Source: Local Media, full page: (LINK). Article in Chinese, edited, abridged.

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H7N9 avian influenza: Why is the epidemic rising significantly this winter?

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At 09:47 on January 19, 2017 from Caixin

[Financial news network] - since December 2016, H7N9 human infection with birdflu epidemic on the rise. The current 2016 annual report is not out, but according to the new financial report in the official website of the monthly statistics, so far, in 2016 a total of 216 cases of human infection H7N9 avian influenza, 63 cases of death.

Compared with previous years, this data is not the highest. In 2013, H7N9 began to be included in China's statutory reporting system of infectious disease monitoring and reporting. In 2013, there were 18 cases of H7N9 avian influenza infection and 1 death. In 2013, there were 330 cases of H7N9 avian influenza and 135 deaths. In 2015, there were 196 cases of H7N9 avian influenza and 92 deaths.

However, the winter of 2016-2017 more serious than in previous years. Single 2016 point of view, in December the country into the H7N9 high season, a substantial increase in the number of infections. The number of infections and deaths in H7N9 in December was the highest in 2016, at 106 and 20 respectively. 100 more infections and an increase of 20 deaths compared to November.

Compared with the same period in previous years, in December this year, regardless of the number of infections and deaths are the highest. The same period in 2013, the same period in 2014, the same period in 2015 the number of infections were 5,19,10 people, the death toll was 0,4,3 people.

From the provincial Wei Planning Commission and public reports, the Yangtze River Delta region is still the "hardest hit." December 2016, Jiangsu Province, 54 people infected, 14 people were killed. Zhejiang Province, 20 people infected, one person died. Guangdong Province, 11 cases of infection, located in Foshan, 3 cases, 2 cases in Guangzhou, Zhongshan, Zhaoqing, Meizhou, Dongguan, Qingyuan and Shunde in 1 case. Other provinces such as Fujian Province, infection 2, 5 people infected in Anhui Province, Shandong Province, 2 people infected.

Avoiding Live poultry contact remains a key prevention measure

According to a new financial report, H7N9 avian flu has "exposure history of live birds".

"Live poultry market is still risk factors for H7N9 infection," Zhejiang University School of Medicine First Hospital, State Key Laboratory of Infectious Diseases, Xiao Xiao Yong, deputy director of the new financial Reporters said.

Live poultry market infection is also leading to the epidemic in Guangdong, the main reason for the heavier. Guangdong Provincial Center for Communicable Disease Control and Prevention Director, chief expert He Jianfeng held in January 17 in Guangdong Province H7N9 epidemic prevention and control media briefing, said a considerable part comes from rural areas, "these places have to buy live chicken back Domesticated to eat the custom of the New Year, which led to continuous contact with human and live birds, greatly increasing the risk of infection.

At present, Guangdong, Nanjing, Shandong and other places have begun to suspend live poultry market transactions.

He Jianfeng said that the so-called "human transmission" of the situation did not occur, the current virus and compared to the past and no significant variation in the current cases are exposed to the market environment or direct contact with poultry populations.

Xiao Yonghong said, strictly speaking, the current incidence of H7N9 avian influenza is still very low, the concentration of disease outbreaks is very low, in a sporadic state, and will not cause a national outbreak, without too much panic.

Why the recent epidemic rise faster

As to why in December 2016 the number of H7N9 avian influenza infection will surge, especially in the Yangtze River Delta region of Jiangsu was significant, Xiao Yonghong said, the Yangtze River Delta region in winter movement of people and more birds, so the epidemic rise faster.

Jiangsu Center for Disease Control and Prevention in the December 2016 epidemic report released when the four reasons mentioned, seasonal reasons and the live poultry market is well known two common reasons.

According to the China Meteorological Administration, from December 1 to 28, 2016, the national average temperature of -0.3 ℃, compared with the same period in 2015 (-2.1 ℃) 1.8 ℃, the highest in the history of the same period.

Data show that Jiangsu Province, live poultry market and other external environmental monitoring showed H7 virus-positive rate in December 2016 to 15.79%, and the vast majority of H7N9 positive. A sample of 490 specimens of poultry slaughter sites in Zhangzhou city, Fujian province, was reported to be positive for one patient.

Jiangsu's report also mentioned the emergence of two new reasons this year: one is related to the recent climate change, since October 2016, Jiangsu Province, overcast and rainy weather, air humidity, high average temperature, help to extend the birds Survival time of influenza virus in external environment. The second is the frequent occurrence of fog and haze, to stimulate the human respiratory mucosa, reducing the resistance of the virus.

For the haze of the impact of H7N9 infection, Xiao Yonghong said that remains to be further studied.

H7N9 bird flu on the incidence of population characteristics of view, "first infected with H7N9 avian flu most of the people are frail elderly people," Xiao Yonghong H7N9 had three years of clinical observation, he believes that the reason why the current mortality rate is so high, "Some people with underlying disease or poor immune function are more likely to die than normal people."

Guangdong Province also released the 2016 H7N9 avian flu crowd characteristics: Guangdong Province, compared with previous years, compared to the characteristics of no significant change in favor of susceptibility in the elderly, the median age of onset is 52 years old, the largest 84 years old.

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Keywords: China; Avian Influenza; H7N9; Human; Poultry.

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