Surra (Trypanosoma evansi),
Information received on 24/11/2016 from Dr. Eduardo Barre Albera, Director General, Servicios Ganaderos, Ministerio de Ganaderķa, Agricultura y Pesca, Montevideo, Uruguay
Report type Immediate notification (Final report)
Date of start of the event 07/09/2016
Date of confirmation of the event 20/10/2016
Report date 24/11/2016
Date submitted to OIE 24/11/2016
Date event resolved 19/11/2016
Reason for notification First occurrence of a listed disease in the country
Causal agent Trypanosoma evansi
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (1)
Outbreak 1 Rivera, Rivera, Rivera
Date of start of the outbreak 07/09/2016
Outbreak status Resolved (19/11/2016)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Dogs 1 0 1 0
Affected population The Rivera Health Directorate reported in September that private veterinarians in the city were informed of two groups of dogs that (apparently) integrate with packs of wild boar hunting dogs. One group came from the Northern Lakes area and the other from the city of Rivera. Dogs with clinical signs, which were still alive (four animals had already died), had clinical signs such as edema, bleeding and anemia. The private veterinarians took blood samples from the dogs of both groups and they were sent to Montevideo, Department of Public Health Laboratories, Laboratory of Vector Surveillance, and to the Department of Parasitology and Mycology of the Institute of Hygiene.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Dogs 1 0 1 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Dogs ** ** 0.00% **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Source of the outbreak(s) or origin of infection
  • Vectors
Epidemiological comments Samples from the dogs of Rivera were submitted to direct study, PCR, culture in appropriate media and inoculation in NUDE and Balb C mice. No infectious agent was identified in dogs from the Northern Lakes area. However, blood from a female dog of Rivera was infected with trypomastigote forms. Its parasitemia was quantified as 6 million protozoa/ml. of blood. Molecular biological studies performed in the Rivera female dog were able to identify that the trypanosome involved was Trypanosoma evansi. Cultures and mouse inoculation were positive. The authorities from the Ministry of Health will carry out an outbreak investigation on site. Treatment was applied in the Rivera female dog, but she did not respond favorably, she was then euthanized on 19 November.
Control measures
Measures applied
  • Screening
  • 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
Institute of Hygiene (National laboratory) Dogs parasitological examination 10/09/2016 Positive
Pasteur Institute (National laboratory) Dogs inoculation test 20/10/2016 Positive
Pasteur Institute (National laboratory) Dogs real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 15/09/2016 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations