Highly pathogenic avian influenza,
Australia
Information received on 25/08/2020 from Dr Mark Schipp, Chief Veterinary Officer, Department of Agriculture, Water and the Environment, Australian Government, Canberra, Australia
Summary
Report type Follow-up report No. 4
Date of start of the event 24/07/2020
Date of confirmation of the event 31/07/2020
Report date 25/08/2020
Date submitted to OIE 25/08/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 21/02/2014
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H7N7
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
Related reports Immediate notification (31/07/2020)
Follow-up report No. 1 (07/08/2020)
Follow-up report No. 2 (11/08/2020)
Follow-up report No. 3 (18/08/2020)
Follow-up report No. 4 (25/08/2020)
Follow-up report No. 5 (04/09/2020)
New outbreaks (1)
Outbreak 1 Lethbridge, Victoria
Date of start of the outbreak 23/08/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 36878 15 36863 0
Affected population commercial free-range layer farm inside the Lethbridge restricted area
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 36878 ** 15 36863 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** 0.04% ** 100.00%
*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
  • Contact with wild species
Epidemiological comments Depopulation and burial on the first affected property is complete. Disinfection is in progress. Depopulation of the second affected property is complete. Off-site disposal is continuing. A third property with no livestock - a composting site with known high risk trace to the second infected property - has confirmed molecular evidence of H7 influenza A and is also under quarantine. A fourth property located within the restricted area was confirmed on 25 August. Depopulation has commenced. Surveillance both within and outside the restricted area is ongoing.
Control measures
Measures applied
  • Stamping out
  • Quarantine
  • Traceability
  • Surveillance within containment and/or protection zone
  • Surveillance outside containment and/or protection zone
  • Movement control inside the country
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations