Rabbit haemorrhagic disease,
United States of America
Information received on 06/04/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Summary
Report type Follow-up report No. 9
Date of start of the event 08/07/2019
Date of confirmation of the event 17/07/2019
Report date 06/04/2020
Date submitted to OIE 06/04/2020
Date event resolved 03/07/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 16/04/2019
Manifestation of disease Clinical disease
Causal agent Rabbit haemorrhagic disease virus
Serotype RHDV2
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (19/07/2019)
Follow-up report No. 1 (08/08/2019)
Follow-up report No. 2 (16/08/2019)
Follow-up report No. 3 (30/08/2019)
Follow-up report No. 4 (03/12/2019)
Follow-up report No. 5 (07/01/2020)
Follow-up report No. 6 (06/03/2020)
Follow-up report No. 7 (13/03/2020)
Follow-up report No. 8 (27/03/2020)
Follow-up report No. 9 (06/04/2020)
Follow-up report No. 10 (13/04/2020)
Follow-up report No. 11 (20/04/2020)
Follow-up report No. 12 (27/04/2020)
Follow-up report No. 13 (05/05/2020)
Follow-up report No. 14 (13/05/2020)
Follow-up report No. 15 (19/05/2020)
Follow-up report No. 16 (27/05/2020)
Follow-up report No. 17 (01/06/2020)
Follow-up report No. 18 (09/06/2020)
Follow-up report No. 19 (17/06/2020)
Follow-up report No. 20 (23/06/2020)
Follow-up report No. 21 (29/06/2020)
Follow-up report No. 22 (02/07/2020)
New outbreaks (5)
Outbreak 1 Cibola County, Cibola, New Mexico
Date of start of the outbreak 13/02/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 5 2 3 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 2 McKinley County, McKinley, New Mexico
Date of start of the outbreak 18/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 6 3 3 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 3 Lincoln County, Lincoln, New Mexico
Date of start of the outbreak 29/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 8 1 7 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 4 Eddy County, Eddy, New Mexico
Date of start of the outbreak 01/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Black-tailed Jackrabbit:Lepus californicus(Leporidae) 1 1 0 0
Affected population Wild Black-tailed jackrabbit (Lepus californicus)
Outbreak 5 Dona Ana County, Dona Ana, New Mexico
Date of start of the outbreak 02/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Desert Cottontail:Sylvilagus audubonii(Leporidae) 5 5 0 0
Affected population Wild Desert cottontail rabbits (Sylvilagus audubonii)
Summary of outbreaks Total outbreaks: 5
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 19 ** 6 13 0
Black-tailed Jackrabbit:Lepus californicus(Leporidae) 1 1 0 0
Desert Cottontail:Sylvilagus audubonii(Leporidae) 5 5 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Rabbits ** 31.58% ** 100.00%
Black-tailed Jackrabbit:Lepus californicus(Leporidae) ** ** 100.00% **
Desert Cottontail:Sylvilagus audubonii(Leporidae) ** ** 100.00% **
*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 Update Apr 6, 2020: New Mexico--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) from three additional non-commercial premises. Total positive premises in New Mexico is six. Depopulation activities have been completed on five premises and disposal is ongoing. RHDV2 has also been detected in one wild Black-tailed jackrabbit (Lepus californicus) and five wild Desert cottontail rabbits (Sylvilagus audubonii) in two southern counties of New Mexico. New Mexico State Animal Health Officials and the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Services (APHIS) continue their epidemiological investigation into these outbreaks. Currently, there are no known links to outbreak events in Washington or New York.
Control measures
Measures applied
  • Surveillance within containment and/or protection zone
  • Traceability
  • Quarantine
  • Disinfection
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit antigen (Ag) detection ELISA 01/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit reverse transcription - polymerase chain reaction (RT-PCR) 01/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Cottontail rabbits reverse transcription - polymerase chain reaction (RT-PCR) 02/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits antigen (Ag) detection ELISA 27/03/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits antigen (Ag) detection ELISA 01/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 27/03/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 01/04/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations