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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, ...

8 Mar 2017

#Avian #Influenza #H7N9 #Update - 8 March 2017 (#FAO, edited)

 

Title: #Avian #Influenza #H7N9 #Update - 8 March 2017.

Subject: Avian Influenza, H7N9 subtype, poultry epizootics and human cases in China, current epidemiological situation.

Source: Food and Agriculture Organization (FAO), full page: (LINK).

Code: [     ][     ]

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Avian Influenza H7N9 Update - 8 March 2017

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The next update will be issued on 15 March 2017


Disclaimer

Information provided herein is current as of the date of issue. Information added or changed since the last H7N9 situation update appears in red. Human cases are depicted in the geographic location of their report. For some cases, exposure may have occurred in one geographic location but reported in another. For cases with unknown onset date, reporting date was used instead. FAO compiles information drawn from multiple national (Ministries of Agriculture or Livestock, Ministries of Health, Provincial Government websites; Centers for Disease Prevention and Control [CDC]) and international sources (World Health Organization [WHO], World Organisation for Animal Health [OIE]) as well as peer-reviewed scientific articles. FAO makes every effort to ensure, but does not guarantee, accuracy, completeness or authenticity of the information. The designation employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of FAO concerning the legal or constitutional status of any country, territory or sea area, or concerning the delimitation of frontiers.

 

Overview

  • Situation:
    • Influenza A(H7N9) virus with pandemic potential.
  • Country:
    • China; three human cases originated in China and were reported in Malaysia (1) and Canada (2).
  • Number of human cases:
    • 1292 confirmed; 435 deaths (since February 2013)
  • Provinces/municipalities:
    • [China]
      • Beijing,
      • Shanghai and
      • Tianjin municipalities;
      • Anhui,
      • Fujian,
      • Guangdong,
      • Guizhou,
      • Hebei,
      • Henan,
      • Hubei,
      • Hunan,
      • Jiangsu,
      • Jiangxi,
      • Jilin,
      • Liaoning,
      • Qinghai,
      • Shandong,
      • Sichuan,
      • Yunnan and
      • Zhejiang;
      • Hong Kong SAR;
      • Macao SAR,
      • Guangxi,
      • Ningxia Hui and
      • Xinjiang Uyghur Autonomous Regions
    • [Taiwan];
    • [Malaysia]
      • Sabah;
    • [Canada]
      • British Columbia.
  • Animal/environmental findings:
    • over 2,000 virological samples from the environment, chickens, pigeons, ducks and a tree sparrow tested positive; positives mainly from live bird markets, vendors and some commercial or breeding farms.
  • Highly pathogenic virus findings:
    • Out of the 1292 confirmed human cases, H7N9 virus isolates from three cases (two from Guangdong and one from Taiwan Provinces) were found to be highly pathogenic for chickens.
    • In addition, the H7N9 highly pathogenic avian influenza virus was detected in 16 chicken and 6 environmental samples from Guangdong Province.
    • Note: The United States Department of Agriculture (USDA) National Veterinary Services Laboratories (NVSL) have confirmed a North American wild bird lineage H7N9 highly pathogenic avian influenza virus in a chicken sample from Lincoln County, Tennessee. Sequencing of the genome confirmed that all eight gene segments are of a North American wild bird lineage. This virus is thus not the same as the one currently circulating in China. [reference]
  • FAO actions:
    • liaise with China and partners, monitor situation, monitor virus evolution, conduct market chain analysis, risk assessment, surveillance guidance and communication.

 

Map. Human cases and positive findings in birds or the environment

Human cases and positive findings in birds or the environment

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|—Click on image to enlarge –|

Note:  Human cases are depicted in the geographic location where they were reported; for some cases, exposure may have occurred in a different geographic location. Precise location of 11 human cases in Anhui (1), Beijing (1), Guangdong (1), Hunan (1), Hubei (2), Jiangsu (1), Sichuan (2) and Zhejiang (2) Provinces are currently not known, these cases are therefore not shown on the map.

 

Situation update

  • Animals
    • Anhui:
      • in Yuexi County of Anqing City, several markets are still suspended and no re-opening date has been communicated yet [reference].
    • Guangdong
      • Citywide temporary suspension of live poultry markets in Taishan City is still ongoing until 9 March [reference].
      • In Yangjiang, Guangzhou and Meizhou cities, live poultry markets have been re-opened since the beginning of March [reference 1, reference 2, reference 3].
      • Fumin market in Yingde City was closed, cleaned and disinfected on 16 February night after one environmental sample tested positive [reference].
    • Guangxi:
      • in Wuzhou city, the two major live poultry wholesale markets closed on 26 February after 3 environmental samples tested positive for H7.
      • The two markets opened again on 28 February after two days of cleaning and disinfection [reference].
    • Guizhou:
      • in Qiandongnan City, all live poultry trading places in Danzhai and Huangping Counties are suspended until 9 and 15 March, respectively [reference 1, reference 2].
      • For the temporary suspension of live bird markets in Liping County no re-opening date has been communicated yet [reference].
    • Hunan:
      • Yongzhou Huangnijing Market (Yongzhou city) and several markets in Yiyang City re-opened after one week of closure after environmental samples tested H7N9 positive [reference 1, reference 2].
      • Yisuhe Farmers market (Xiangtan County) was closed for one week from 15 to 21 February [reference].
    • Jianxi:
      • Yichun City: temporary suspension of activities in live poultry trading places from 3 March to 2 April [reference].
      • Nanchang City: temporary suspension of live bird markets extended until 31 March [reference].
      • Shangrao City: temporary suspension of all live bird markets in Shangrao and Yashan Counties, including live bird trading areas and white poultry slaughter and sales area in Yiyang County for prevention. Re-opening scheduled on 17 March [reference 1, reference 2].
      • Jiujiang City: temporary suspension of activities in live poultry trading sites and stop of live poultry trade in Xiushui County since environmental specimens tested positive; re-opening scheduled for 16 March [reference]. Temporary suspension of activities in live poultry trading places in Xunyang District until 13 March [reference].
      • Ji'an City: Chengbei Market and eight in-market live bird stalls were closed until 9 March after environmental samples tested positive [reference]. Suichuan County closed live bird markets to prevent avian influenza spread; re-opening is scheduled for 10 March [reference].
      • Ganzhou City: temporary suspension of live poultry trading places in Jingkai and Zhanggong Districts ended on 17 February [reference].
    • 24 February, Chongqing:
      • District CDC detected H7N9 avian influenza virus in the Shangwu Farmers Market, Nan'an District, Chongqing City, through its environment monitoring [reference]. Environmental specimen(s) collected from some chicken farm(s) in Chongqing City also tested positive [reference]. During 2016, Chongqing City collected 1,115 environmental and 8,298 poultry samples and all tested negative for H7 [reference].
  • Humans
    • Since the last update (22 February 2017), 62 new human cases have been reported in:
      • Anhui (12),
      • Guangdong (11),
      • Jiangsu (7),
      • Jiangxi (6),
      • Zhejiang (6),
      • Guangxi (5),
      • Fujian (3),
      • Henan (3),
      • Hunan (3),
      • Hubei (2),
      • Chongqing (1),
      • Guizhou (1),
      • Shandong (1) and
      • Shanghai (1).
    • For detailed information on human cases, please refer to WHO's Disease Outbreak News.

 

Figure 1. Number of positive virological samples from birds or the environment, by province and origin as of 8 March 2017. Information provided corresponds to both high and low pathogenic H7N9 viruses.

Number of positive virological samples from birds or the environment, by province* and origin

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|—Click on image to enlarge –|

 

Figure 2. Number of officially reported human cases since February 2013 as of 08 March 2017. Information provided corresponds to both high and low pathogenic H7N9 viruses.

Number of officially reported human cases since February 2013

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|—Click on image to enlarge –|

 

Figure 3. Incidence of officially reported human cases by month, based on onset date as of 08 March 2017. Information provided corresponds to both high and low pathogenic H7N9 viruses.

Incidence of officially reported human cases by week, based on onset date

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|-- Click to enlarge –|

Note: For cases with unknown onset dates from wave 1 (n=7), wave 2 (n=2), wave 3 (n=146), wave 4 (n= 27) and wave 5 (n=379) reporting dates were used instead.

 

Publications

  • In addition to the surveillance findings by MoA and MoH, 1,728 virologically positive samples have also been reported in 12 peer-reviewed articles (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12). A total of 71,920 samples have been collected in these studies since April 2013, of which 1,728 (2.4%) were positive for H7N9 (1,215 environmental samples, 501 chickens, 1 goose and 1 tree sparrow).
  • An English version of the publication concerning human infection caused by an influenza    A(H7N9) virus with a polybasic cleavage site in Taiwan in 2017 is now available [article].

FAO’s support to countries

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

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