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US - 3 new outbreaks of Tilapia lake virus in commercial farms, Idaho, Wyoming, Colorado (OIE, May 06, 2019)
US - 3 new outbreaks of Tilapia lake virus in commercial farms, Idaho, Wyoming, Colorado (OIE, May 06, 2019)
Tilapia lake virus,
United States of America
Information received on 08/05/2019 from Dr Jack Shere, Deputy Administrator Chief Veterinary Office r, USDA-APHISVeterinary Services, USA United States Department of Agriculture, WASHINGTON, United States of America
Summary
Report type
Immediate notification
Date of start of the event
05/11/2018
Date of confirmation of the event
22/03/2019
Report date
06/05/2019
Date submitted to OIE
08/05/2019
Reason for notification
Emerging disease
Morbidity
2.5 (scale 0 to 5)
Mortality
2.5 (scale 0 to 5)
Zoonotic impact
No
Causal agent
Tilapia lake virus
Serotype
Other
New outbreaks (3)
Outbreak 1
Caribou County, Caribou, Idaho
Date of start of the outbreak
05/11/2018
Outbreak status
Resolved (02/05/2019)
Epidemiological unit
Farm
Water type
Fresh water
Population type
Farmed
Production system
Semi-closed
Affected animals
Species
Morbidity
Mortality
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Nile Tilapia (Oreochromis niloticus)
2 (scale 0 to 5)
2 (scale 0 to 5)
154000
22000
Affected population
Multiple age class commercial farm.
Outbreak 2
Niobrara County, Niobrara, Wyoming
Date of start of the outbreak
07/12/2018
Outbreak status
Continuing (or date resolved not provided)
Epidemiological unit
Farm
Water type
Fresh water
Population type
Farmed
Production system
Closed
Affected animals
Species
Morbidity
Mortality
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Nile Tilapia (Oreochromis niloticus)
3 (scale 0 to 5)
3 (scale 0 to 5)
30000
11500
Affected population
Multiple age class commercial farm.
Outbreak 3
Fremont County, Fremont, Colorado
Date of start of the outbreak
22/04/2019
Outbreak status
Continuing (or date resolved not provided)
Epidemiological unit
Farm
Water type
Fresh water
Population type
Farmed
Production system
Closed
Affected animals
Species
Morbidity
Mortality
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Nile Tilapia (Oreochromis niloticus)
1 (scale 0 to 5)
0 (scale 0 to 5)
22000
0
Affected population
Multiple age class commercial farm. No clinical signs of disease present at this facility.
Summary of outbreaks
Total outbreaks: 3
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Nile Tilapia (Oreochromis niloticus)
206000
**
33500
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Nile Tilapia (Oreochromis niloticus)
**
**
**
**
*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
Introduction of new live animals
Epidemiological comments
The United States Department of Agriculture (USDA) Animal Plant Health Inspection Services (APHIS) and the State Departments of Agriculture are conducting a comprehensive epidemiological investigation of this event. The epidemiological investigation determined that clinical signs consistent with Tilapia lake virus (TiLV) were first observed on the index premises in November 2018. All clinically ill fish were depopulated. Exposed fish in the same tanks will either be depopulated or sent to terminal market. The affected holdings will be cleaned and disinfected. Surveillance and testing related to this event are ongoing. This is the first detection of TiLV in the United States.
Control measures
Measures applied
Surveillance outside infected and/or protection zone
Quarantine
Selective killing and disposal
Disinfection
Vaccination permitted (if a vaccine exists)
No treatment of affected animals
Measures to be applied
No other measures
Diagnostic test results
Laboratory name and type
Species
Test
Test date
Result
National Veterinary Services Laboratories (National laboratory)
Nile Tilapia (Oreochromis niloticus)
gene sequencing
15/03/2019
Positive
National Veterinary Services Laboratories (National laboratory)
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