OIE: Highly pathogenic avian influenza, China (People´s Rep. of)

Information received on 09/05/2017 from Dr Zhang Zhongqiu, Director General , China Animal Disease Control Centre, Veterinary Bureau, Ministry of Agriculture, Beijing, China (People´s Rep. of)
Summary
Report type Follow-up report No. 2
Date of start of the event 10/01/2017
Date of confirmation of the event 18/02/2017
Report date 09/05/2017
Date submitted to OIE 09/05/2017
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2015
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H7N9
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (18/02/2017)
Follow-up report No. 1 (01/03/2017)
Follow-up report No. 2 (09/05/2017)
New outbreaks (6)
Outbreak 1 Chenzhou, Jiahe, HUNAN
Date of start of the outbreak 23/02/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 911 911 0
Affected population 4 chicken swab samples were collected in a backyard, the results were positive. All live poultry markets were closed, cleaned and disinfected.No unusual situation was observed in local poultry farms.
Outbreak 2 Chenzhou, HUNAN
Date of start of the outbreak 23/02/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Livestock market
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds
Affected population 3 chicken swab samples, 1 duck swab samples, and 4 environment samples were tested and the results were positive in 3 different live bird markets.
Outbreak 3 Guangzhou, GUANGDONG
Date of start of the outbreak 02/03/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Livestock market
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds
Affected population 2 chicken swab samples were tested and the results were positive in 2 different live bird market.
Outbreak 4 Zhongshan, GUANGDONG
Date of start of the outbreak 02/03/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Livestock market
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds
Affected population One chicken swab sample was tested and the result was positive in live bird market.
Outbreak 5 Meizhou, GUANGDONG
Date of start of the outbreak 02/03/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Livestock market
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds
Affected population One chicken swab sample was tested and the result was positive in live bird market.
Outbreak 6 Xingtai, Xingtai, HEBEI
Date of start of the outbreak 28/04/2017
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 30000 8500 5000 25000 0
Affected population The outbreak was observed in local layer farm by active surveillance.
Summary of outbreaks Total outbreaks: 6
Total animals affected
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 30911 8500 ** 5000 25911 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** ** ** **
*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 outbreaks were found through active surveillance. Clinical signs were observed by monitoring and investigation. All susceptible birds were destroyed.
Control measures
Measures applied
  • Movement control inside the country
  • Screening
  • Disinfection / Disinfestation
  • Quarantine
  • Stamping out
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
Harbin National Reference Lab for Avian Influenza (OIE Reference Laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 05/05/2017 Positive
Harbin National Reference Lab for Avian Influenza (OIE Reference Laboratory) Birds virus isolation 05/05/2017 Positive
Harbin National Reference Lab for Avian Influenza (OIE Reference Laboratory) Birds virus sequencing 02/03/2017 Positive
Harbin National Reference Lab for Avian Influenza (OIE Reference Laboratory) Birds virus sequencing 06/03/2017 Positive
Harbin National Reference Lab for Avian Influenza (OIE Reference Laboratory) Birds virus sequencing 05/05/2017 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.