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#Update: Increase in #Human #Infections with #Avian #Influenza #H7N9 Viruses During the 5th #Epidemic — #China, Oct. ‘16–Aug. 7 ‘17 (@CDCgov, edited)

Title : #Update: Increase in #Human #Infections with #Avian #Influenza #H7N9 Viruses During the 5th #Epidemic — #China, Oct. ‘16–Aug. 7 ‘17....

17 Mar 2017

Highly pathogenic #avian #influenza #H7N9, #USA [a #poultry #outbreak, #Tennessee] (#OIE, Mar. 17 ‘17)

Title: Highly pathogenic #avian #influenza #H7N9, #USA [a #poultry #outbreak, #Tennessee].

Subject: Avian Influenza, H7N9 subtype, poultry epizootics in the US.

Source: OIE, full page: (LINK).

Code: [     ]


Highly pathogenic avian influenza H7N9, United States of America

Information received on 17/03/2017 from Dr John Clifford, Official Delegate, Chief Trade Advisor, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America

  • Summary
    • Report type    Follow-up report No. 2
    • Date of start of the event    01/03/2017
    • Date of confirmation of the event    04/03/2017
    • Report date    17/03/2017
    • Date submitted to OIE    17/03/2017
    • Reason for notification    Reoccurrence of a listed disease
    • Date of previous occurrence    2016
    • Manifestation of disease    Clinical disease
    • Causal agent    Highly pathogenic avian influenza virus
    • Serotype    H7N9
    • Nature of diagnosis    Laboratory (advanced)
    • This event pertains to    a defined zone within the country
  • Summary of outbreaks   
    • Total outbreaks: 1
      • Total animals affected: Species    - Susceptible    - Cases    - Deaths    - Destroyed    - Slaughtered
        • Birds    - 55000    - **    - 344    - 30000    - 0
      • Outbreak statistics: Species    - Apparent morbidity rate    - Apparent mortality rate    - Apparent case fatality rate    - Proportion susceptible animals lost*
        • Birds    - **    - 0.63%    - **    - 55.17%
          • *Removed from the susceptible population through death, destruction and/or slaughter
          • **Not calculated because of missing information
  • Epidemiology
    • Source of the outbreak(s) or origin of infection   
      • Unknown or inconclusive
  • Epidemiological comments   
    • The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with the Tennessee Department of Agriculture, are continuing to respond to the identification of a highly pathogenic avian influenza (HPAI) H7N9 in commercial breeder flocks in Lincoln County, Tennessee.
    • This H7N9 strain is of North American wild bird lineage.
    • This is NOT the same as the China H7N9 lineage that has impacted poultry and infected humans in Asia.
    • Although the subtypes are the same (H7N9) the virus detected in the United States is a very different virus, genetically distinct from the China H7N9 lineage.
    • A comprehensive epidemiological investigation in the surrounding area is continuing and enhanced surveillance and testing is ongoing.
    • Surveillance samples from a premises located within the infection zone (3 kilometers) confirmed a second outbreak of the same North American strain of avian influenza HPAI H7N9.
    • State officials have quarantined the affected premises and implemented movement controls.
    • Depopulation of birds on the second premises has begun.




Keywords: OIE; Updates; Avian Influenza; H7N9 ; Poultry; USA; Tennessee.