Rabbit haemorrhagic disease,
United States of America
Information received on 13/04/2020 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. 10
Date of start of the event 08/07/2019
Date of confirmation of the event 17/07/2019
Report date 13/04/2020
Date submitted to OIE 13/04/2020
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 (11)
Outbreak 1 Santa Fe County, Santa Fe, New Mexico
Date of start of the outbreak 07/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 30 16 14 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 2 Curry County, Curry, New Mexico
Date of start of the outbreak 20/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 400 15 385 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 3 Chaves County, Chaves, New Mexico
Date of start of the outbreak 20/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 10 2 8 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 4 Dona Ana County, Dona Ana, New Mexico
Date of start of the outbreak 23/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 4 4 4 0 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 5 Valencia County, Valencia, New Mexico
Date of start of the outbreak 23/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 11 8 3 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 6 Hockley County, Hockley, Texas
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 113 7 6 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 7 McKinley County, McKinley, New Mexico
Date of start of the outbreak 30/03/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 9 4 4 5 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 8 Grant County, Grant, New Mexico
Date of start of the outbreak 01/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 16 9 7 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 9 Navajo County, Navajo, Arizona
Date of start of the outbreak 02/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 18 15 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 10 Cochise County, Cochise, Arizona
Date of start of the outbreak 06/04/2020
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 11 Cochise County, Cochise, Arizona
Date of start of the outbreak 06/04/2020
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) 6 6 0 0
Affected population Wild Desert cottontail rabbits (Sylvilagus audubonii)
Summary of outbreaks Total outbreaks: 11
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 611 8 ** 80 428 0
Black-tailed Jackrabbit:Lepus californicus(Leporidae) 1 1 0 0
Desert Cottontail:Sylvilagus audubonii(Leporidae) 6 6 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Rabbits ** 13.09% ** **
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 13, 2020: Arizona--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) on one non-commercial premises in Navajo County, Arizona. RHDV2 has also been detected in wild Black-tailed jackrabbits (Lepus californicus) and wild Cottontail rabbits (Sylvilagus) in Cochise County, Arizona. These are the first detections of RHDV2 in wild and domestic rabbits from Arizona. Disease response activities are pending. Arizona State Animal Health Officials and the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Services (APHIS) have begun an epidemiological investigation into the outbreaks. Texas--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) on one non-commercial premises in Hockley County, Texas. This is the first detection of RHDV2 in the state of Texas. Disease response activities are pending. Texas State Animal Health Officials and the USDA, APHIS have begun an epidemiological investigation into the outbreak. New Mexico--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) from seven additional non-commercial premises. Total positive premises in New Mexico is 13. State officials are placing quarantines and requiring depopulation on all confirmed positive premises. Depopulation activities have been completed on seven premises and disposal (incineration recommended) is ongoing. New Mexico State Animal Health Officials and the USDA, APHIS continue their epidemiological investigation into these outbreaks. General clinical signs seen in confirmed cases from all three southwestern states include lethargy, seizures, and sudden death. 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 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit reverse transcription - polymerase chain reaction (RT-PCR) 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Cottontail rabbits antigen (Ag) detection ELISA 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Cottontail rabbits reverse transcription - polymerase chain reaction (RT-PCR) 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Desert Cottontail antigen (Ag) detection ELISA 02/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits antigen (Ag) detection ELISA 03/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits antigen (Ag) detection ELISA 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits antigen (Ag) detection ELISA 09/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 03/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 08/04/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 09/04/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations