Lumpy skin disease,
Hong Kong (SAR - PRC)
Information received on 25/11/2020 from Dr Thomas Sit, Chief Veterinary Officer / Assistant Director (Inspection & Quarantine), Agriculture, Fisheries and Conservation Department, Hong Kong Special Administrative Region Government, Hong Kong , Hong Kong (SAR - PRC)
Summary
Report type Immediate notification
Date of start of the event 04/10/2020
Date of confirmation of the event 21/11/2020
Report date 24/11/2020
Date submitted to OIE 25/11/2020
Reason for notification First occurrence of a listed disease in the country
Causal agent Lumpy skin disease virus
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced), Necropsy
This event pertains to the whole country
Related reports Immediate notification (24/11/2020)
Follow-up report No. 1 (04/12/2020)
Follow-up report No. 2 (11/12/2020)
Follow-up report No. 3 (29/12/2020)
New outbreaks (1)
Outbreak 1 Sai Kung, Sai Kung, Hong Kong
Date of start of the outbreak 04/10/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Other
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 4 0
Affected population There is a population of approximately 1,200 feral cattle scattered throughout Hong Kong countryside and country parks. Since October, clinical signs have become evident in herds located distantly from each other. 20-30% of animals of certain herds, especially in Sai Kung and Mui Wo are affected.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle ** 4 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle ** ** ** **
*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
  • Unknown or inconclusive
Epidemiological comments Reported generalized skin nodules and/or mucosal ulcers in several different populations of the feral cattle in October 2020. A few showed systemic signs such as fever and weakness. Increasing morbidity and low mortality. Skin biopsies submitted on 27 October had necrotizing vasculitis and infarcts under light microscopy. Two cattle were submitted on 30 October for post-mortem examination. Sheep pox cells, ballooning degeneration were identified under histopathology exam in addition to necrotizing vasculitis. Subsequent molecular and serology results from OIE reference laboratory for PCR and ELISA has confirmed the disease as lumpy skin disease. The majority of cattle in Hong Kong are feral animals, which are not involved in livestock trade activities. Risk assessment and management plan is being drafted.
Control measures
Measures applied
  • Selective killing and disposal
  • 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
Tai Lung Veterinary Laboratory, Agriculture Fisheries and Conservation Department (National laboratory) Cattle histopathological examination 12/11/2020 Positive
The Pirbright Institute (OIE Reference Laboratory) Cattle enzyme-linked immunosorbent assay (ELISA) 21/11/2020 Positive
The Pirbright Institute (OIE Reference Laboratory) Cattle real-time PCR 21/11/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations