White spot disease,
Australia
Information received on 01/12/2016 from Dr Mark Schipp, Chief Veterinary Officer, Department of Agriculture and Water Resources, Australian Government, Canberra, Australia
Summary
Report type Immediate notification
Date of start of the event 22/11/2016
Date of confirmation of the event 01/12/2016
Report date 01/12/2016
Date submitted to OIE 01/12/2016
Date event resolved 23/05/2017
Reason for notification First occurrence of a listed disease
Manifestation of disease Clinical disease
Causal agent White spot syndrome virus
Nature of diagnosis Laboratory (advanced)
This event pertains to the whole country
Related reports Immediate notification (01/12/2016)
Follow-up report No. 1 (08/12/2016)
Follow-up report No. 2 (15/12/2016)
Follow-up report No. 3 (22/12/2016)
Follow-up report No. 4 (29/12/2016)
Follow-up report No. 5 (12/01/2017)
Follow-up report No. 6 (19/01/2017)
Follow-up report No. 7 (25/01/2017)
Follow-up report No. 8 (01/02/2017)
Follow-up report No. 9 (08/02/2017)
Follow-up report No. 10 (16/02/2017)
Follow-up report No. 11 (21/02/2017)
Follow-up report No. 12 (03/03/2017)
Follow-up report No. 13 (08/03/2017)
Follow-up report No. 14 (15/03/2017)
Follow-up report No. 15 (23/03/2017)
Follow-up report No. 16 (30/03/2017)
Follow-up report No. 17 (06/04/2017)
Follow-up report No. 18 (13/04/2017)
Follow-up report No. 19 (26/04/2017)
Follow-up report No. 20 (11/05/2017)
Follow-up report No. 21 (18/05/2017)
Follow-up report No. 22 (25/05/2017)
Follow-up report No. 23 (08/06/2017)
New outbreaks (1)
Outbreak 1 Logan River, Queensland
Date of start of the outbreak 22/11/2016
Outbreak status Resolved (10/12/2016)
Epidemiological unit Pond
Water type Salt water
Population type Farmed
Production system Semi-closed
Affected animals
Species Morbidity Mortality Susceptible Cases Deaths Killed and disposed of Slaughtered
Giant tiger prawn (Penaeus monodon) (t) 0 (scale 0 to 5) 4 (scale 0 to 5)
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Giant tiger prawn (Penaeus monodon) (t) **
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Giant tiger prawn (Penaeus monodon) (t) ** ** ** **
*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 On Tuesday 22 November 2016, a prawn farmer reported a minor mortality event with a small numbers of dead prawns, reduced feeding and some unusual swimming behaviour. Samples were collected on 22 and 25 November 2016 and processed with routine priority. Higher mortalities were reported from one pond on 28 November 2016. Positive PCR results from Queensland’s Biosecurity Sciences Laboratory were reported on 30 November 2016 and confirmed by the Australian Animal Health Laboratory on 1 December 2016. Measures to contain the disease to the affected farm have been applied. The disease response aims to eradicate the disease from the affected farm and confirm freedom in nearby farms and in wild crustaceans. The source of the outbreak is unknown.
Control measures
Measures applied
  • Traceability
  • Quarantine
  • Surveillance outside containment and/or protection zone
  • Stamping out
  • Zoning
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
Diagnostic test results
Laboratory name and type Species Test Test date Result
Australian Animal Health Laboratory (National laboratory) Giant tiger prawn (Penaeus monodon) gene sequencing 01/12/2016 Positive
Australian Animal Health Laboratory (National laboratory) Giant tiger prawn (Penaeus monodon) polymerase chain reaction (PCR) 01/12/2016 Positive
Australian Animal Health Laboratory (National laboratory) Giant tiger prawn (Penaeus monodon) real-time PCR 01/12/2016 Positive
Australian Animal Health Laboratory (National laboratory) Giant tiger prawn (Penaeus monodon) real-time PCR 01/12/2016 Positive
Queensland Biosecurity Sciences Laboratory (Regional Laboratory) Giant tiger prawn (Penaeus monodon) histopathological examination 30/11/2016 Positive
Queensland Biosecurity Sciences Laboratory (Regional Laboratory) Giant tiger prawn (Penaeus monodon) polymerase chain reaction (PCR) 30/11/2016 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations