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US - 3 new outbreaks of Tilapia lake virus in commercial farms, Idaho, Wyoming, Colorado (OIE, May 06, 2019)

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  • 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) Nile Tilapia (Oreochromis niloticus) reverse transcription - polymerase chain reaction (RT-PCR) 08/03/2019 Positive
    National Veterinary Services Laboratories (National laboratory) Nile Tilapia (Oreochromis niloticus) reverse transcription - polymerase chain reaction (RT-PCR) 29/04/2019 Positive
    National Veterinary Services Laboratories (National laboratory) Nile Tilapia (Oreochromis niloticus) virus isolation 22/03/2019 Positive
    Private Laboratory (Private Laboratory) Nile Tilapia (Oreochromis niloticus) virus isolation 26/02/2019 Positive
    Future Reporting
    The event is continuing. Weekly follow-up reports will be submitted.
    ...
    http://www.oie.int/wahis_2/public/wa...reportid=30412
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