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Tilapia lake virus, Peru
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Information received on 08/02/2020 from Dra. Eva Luz Martínez Bermúdez, Medico Veterinario, Servicio Nacional de Sanidad Agraria,
Ministerio de Agricultura y Riego, Lima, Peru
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Summary
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Outbreak 1 |
Huanuco, Monzón, Huamalíes, Huanuco |
Date of start of the outbreak |
27/09/2019 |
Outbreak status |
Resolved (29/10/2019) |
Epidemiological unit |
Pond |
Water type |
Fresh water |
Population type |
Farmed |
Production system |
Semi-closed |
Affected animals |
Species |
Morbidity |
Mortality |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
tilapia (Oreochromis niloticus) |
2 (scale 0 to 5) |
2 (scale 0 to 5) |
1000 |
200 |
200 |
0 |
0 |
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Affected population |
13-cm-long tilapia coming from a seed production center in the department of San Martin (August 2019).
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Summary of outbreaks |
Total outbreaks: 1 |
Total animals affected |
Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
tilapia (Oreochromis niloticus) |
1000 |
200 |
200 |
0 |
0 |
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Outbreak statistics |
Species |
Apparent morbidity rate |
Apparent mortality rate |
Apparent case fatality rate |
Proportion susceptible animals lost* |
tilapia (Oreochromis niloticus) |
20.00% |
20.00% |
100.00% |
20.00% |
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*Removed from the susceptible population through death, destruction and/or slaughter |
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Epidemiology
Source of the outbreak(s) or origin of infection |
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Unknown or inconclusive
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Introduction of new live animals
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Fomites (humans, vehicles, feed, etc.)
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Horizontal spread through water
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Epidemiological comments |
Tilapia lake virus was introduced into the Department of Huanuco following movement of tilapia fry from the Department of San Martin. It is worth mentioning that deaths due to the virus were observed in the seed production center in 2018 and that, in 2019, no mortalities were observed; however, the presence of the virus was detected in a batch of asymptomatic breeders. |
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Control measures
Measures applied |
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Surveillance outside infected and/or protection zone
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Surveillance within infected and/or protection zone
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Traceability
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Stamping out
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Control of vectors
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Vaccination permitted (if a vaccine exists)
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No treatment of affected animals
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Measures to be applied |
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Movement control inside the country
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Disinfection / Disinfestation
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Surveillance outside containment and/or protection zone
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Surveillance within containment and/or protection zone
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Diagnostic test results
Laboratory name and type |
Species |
Test |
Test date |
Result |
Molecular Biology Laboratory of the National Fish Health Agency, SANIPES (National laboratory) |
tilapia (Oreochromis niloticus) |
real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) |
23/10/2019 |
Positive |
Laboratory of Histopathology, Embryology and Veterinary Pathology of the Faculty of Veterinary Medicine, UNMSM (National laboratory) |
tilapia (Oreochromis niloticus) |
histopathological examination |
22/10/2019 |
Positive |
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Future Reporting
The event is continuing. Weekly follow-up reports will be submitted. |
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Map of outbreak locations
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