Tilapia lake virus,
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
Report type Follow-up report No. 7
Date of start of the event 09/11/2017
Date of confirmation of the event 20/12/2017
Report date 07/02/2020
Date submitted to OIE 08/02/2020
Reason for notification Emerging disease
Morbidity 2 (scale 0 to 5)
Mortality 2 (scale 0 to 5)
Zoonotic impact No
Causal agent Tilapia lake virus
Related reports Immediate notification (27/02/2018)
Follow-up report No. 1 (27/04/2018)
Follow-up report No. 2 (07/06/2018)
Follow-up report No. 3 (12/06/2018)
Follow-up report No. 4 (25/06/2018)
Follow-up report No. 5 (14/02/2019)
Follow-up report No. 6 (15/02/2019)
Follow-up report No. 7 (07/02/2020)
New outbreaks (1)
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
Affected population 13-cm-long tilapia coming from a seed production center in the department of San Martin (August 2019).
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
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%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
  • Introduction of new live animals
  • Fomites (humans, vehicles, feed, etc.)
  • Horizontal spread through water
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.
Control measures
Measures applied
  • Surveillance outside infected and/or protection zone
  • Surveillance within infected and/or protection zone
  • Traceability
  • Stamping out
  • Control of vectors
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Movement control inside the country
  • Disinfection / Disinfestation
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
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
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations