Epizootic ulcerative syndrome,
Information received on 03/12/2020 from Dr Letlhogile Modisa, Director, Veterinary Services, Ministry of Agriculture, Gaborone, Botswana
Report type Follow-up report No. 3 (Final report)
Date of start of the event 31/07/2020
Date of confirmation of the event 31/07/2020
Report date 03/12/2020
Date submitted to OIE 03/12/2020
Date event resolved 12/11/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 31/10/2010
Manifestation of disease Clinical disease
Causal agent Aphanomyces invadans
Nature of diagnosis Clinical
This event pertains to a defined zone within the country
Related reports Immediate notification (08/08/2020)
Follow-up report No. 1 (10/09/2020)
Follow-up report No. 2 (02/10/2020)
Follow-up report No. 3 (03/12/2020)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
  • Horizontal spread through water
Epidemiological comments Surveillance so far since the last report have not detected any sick or dying fishes in areas where ish were reported to be sick or dying in late July 2020. All information gathered from passive surveillance including fisherman catches have also not indicated any significant findings. It appears the disease outbreak has subsided. The fish slaughtered for human consumption from the aquaculture sector represented 5,000kg.
Control measures
Measures applied
  • Surveillance outside infected and/or protection zone
  • Surveillance within infected and/or protection zone
  • Emergency harvest
  • Killing for commercial use or own use
  • 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
Botswana National Veterinary Laboratory (National laboratory) Squicker (cynodontis species) histopathological examination 20/08/2020 Negative
Future Reporting
The event is resolved. No more reports will be submitted.