Acute hepatopancreatic necrosis disease,
United States of America
Information received on 23/08/2017 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 Immediate notification
Date of start of the event 14/06/2017
Date of confirmation of the event 21/07/2017
Report date 23/08/2017
Date submitted to OIE 23/08/2017
Reason for notification First occurrence of a listed disease in the country
Causal agent Vibrio parahaemolyticus
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (1)
Outbreak 1 Cameron County, Cameron, TEXAS
Date of start of the outbreak 14/06/2017
Outbreak status Continuing (or date resolved not provided)
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
Pacific white shrimp (Penaeus (Litopenaeus) vannam (kg) 2 (scale 0 to 5) 2 (scale 0 to 5)
Affected population Farmed shrimp
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Pacific white shrimp (Penaeus (Litopenaeus) vannam (kg) **
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Pacific white shrimp (Penaeus (Litopenaeus) vannam (kg) ** ** ** **
*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 United States Department of Agriculture Animal and Plant Health Inspection Service Veterinary Services and the Texas Parks and Wildlife Department are conducting an epidemiological investigation of the event.
Control measures
Measures applied
  • Movement control inside the country
  • Quarantine
  • Killing for commercial use or own use
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Diagnostic test results
Laboratory name and type Species Test Test date Result
University of Arizona (OIE Reference Laboratory) Pacific white shrimp (Penaeus (Litopenaeus) vannamei) histopathological examination 21/07/2017 Positive
University of Arizona (OIE Reference Laboratory) Pacific white shrimp (Penaeus (Litopenaeus) vannamei) polymerase chain reaction (PCR) 21/07/2017 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations