Rabbit haemorrhagic disease,
United States of America
Information received on 14/05/2020 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. 14
Date of start of the event 08/07/2019
Date of confirmation of the event 17/07/2019
Report date 13/05/2020
Date submitted to OIE 14/05/2020
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 (15)
Outbreak 1 Socorro County, Socorro, New Mexico
Date of start of the outbreak 27/04/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 2 2 2 0 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 2 Cochise County, Cochise, Arizona
Date of start of the outbreak 01/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 19 9 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 3 Navajo County, Navajo, Arizona
Date of start of the outbreak 02/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 23 8 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 4 Maricopa County, Maricopa, Arizona
Date of start of the outbreak 04/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 14 1 13 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 5 Pinal County, Pinal, Arizona
Date of start of the outbreak 04/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 30 28 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 6 Bernalillo County, Bernalillo, New Mexico
Date of start of the outbreak 04/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 2 1 1 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 7 El Paso County, El Paso, Colorado
Date of start of the outbreak 07/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
European Rabbit:Oryctolagus cuniculus(Leporidae) 22 22 0
Affected population Feral European rabbits (Oryctolagus cuniculus)
Outbreak 8 Lubbock County, Lubbock, Texas
Date of start of the outbreak 07/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 1 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 9 Riverside County, Riverside, California
Date of start of the outbreak 07/05/2020
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 10 Pima County, Pima, Arizona
Date of start of the outbreak 07/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 5 4 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 11 Pecos County, Pecos, Texas
Date of start of the outbreak 07/05/2020
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) 35 35 0 0
Affected population Wild Black-tailed jackrabbits (Lepus californicus)
Outbreak 12 Prowers County, Prowers, Colorado
Date of start of the outbreak 07/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cottontail rabbits:Sylvilagus(Leporidae) 1 1 0 0
Affected population Wild Cottontail rabbits (Sylvilagus sp)
Outbreak 13 Jeff Davis County, Jeff Davis, Texas
Date of start of the outbreak 07/05/2020
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) 10 10 0 0
Affected population Wild Black-tailed jackrabbit (Lepus californicus)
Outbreak 14 Midland County, Midland, Texas
Date of start of the outbreak 08/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 5 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 15 Hockley County, Hockley, Texas
Date of start of the outbreak 08/05/2020
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) 3 3 0 0
Affected population Wild Black-tailed jackrabbits (Lepus californicus)
Summary of outbreaks Total outbreaks: 15
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 95 2 ** 59 14 0
European Rabbit:Oryctolagus cuniculus(Leporidae) 22 22 0
Black-tailed Jackrabbit:Lepus californicus(Leporidae) 49 49 0 0
Cottontail rabbits:Sylvilagus(Leporidae) 1 1 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Rabbits ** ** ** **
European Rabbit:Oryctolagus cuniculus(Leporidae) ** ** 100.00% **
Black-tailed Jackrabbit:Lepus californicus(Leporidae) ** ** 100.00% **
Cottontail rabbits:Sylvilagus(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 May 13, 2020: California (CA)--RHDV2 confirmed in a wild Black-tailed jackrabbit (Lepus californicus) from Riverside County, CA on 11 May 2020. This is the first detection of RHDV2 in California. California 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 this outbreak. Nevada (NV)--Nevada State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into this outbreak. Colorado (CO)--RHDV2 confirmed in a wild Cottontail rabbit (Sylvilagus sp) from Prowers County and feral European rabbits (Oryctolagus cuniculus) from El Paso County. Colorado State Animal Health Officials and USDA, APHIS continue an epidemiological investigation into the current outbreaks. Arizona (AZ)--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) on five additional non-commercial premises. Total positive premises in Arizona is 18. All affected premises have been quarantined and depopulation has been completed on nine of the affected premises. Disposal activities are ongoing. Arizona State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreaks. Texas (TX)--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) on two additional non-commercial premises in Midland and Lubbock Counties. Total positive premises in Texas is seven. There have been three new wild rabbit detections of RHDV2 in Black-tailed jackrabbits (Lepus californicus) from several counties within the state. Texas State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreaks. New Mexico (NM)--RHDV2 confirmed in domestic rabbits (Oryctolagus cuniculus) from two additional non-commercial premises. Total positive premises in New Mexico is 28. All affected premises have been quarantined and depopulation has been completed on 23 of the affected premises. Disposal activities are ongoing. Six of the affected premises completed cleaning and disinfection activities and now begin a 90-day fallow period. New Mexico State Animal Health Officials and the USDA, APHIS continue their epidemiological investigation into the current outbreaks. General clinical signs seen in confirmed cases from all the affected states include lethargy, seizures, and sudden death. Animal Health Officials in association with wildlife partners of all affected southwestern states have issued online announcements of RHDV2 detections within their borders. They continue to provide outbreak updates as well as resources concerning the disease and biosecurity practices for rabbit owners, wildlife rehabilitators, veterinarians and the public.
Control measures
Measures applied
  • Disinfection
  • Quarantine
  • Traceability
  • Surveillance within containment and/or protection zone
  • 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
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit reverse transcription - polymerase chain reaction (RT-PCR) 07/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit reverse transcription - polymerase chain reaction (RT-PCR) 08/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Black-tailed Jackrabbit reverse transcription - polymerase chain reaction (RT-PCR) 11/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Cottontail rabbits reverse transcription - polymerase chain reaction (RT-PCR) 07/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) European Rabbit reverse transcription - polymerase chain reaction (RT-PCR) 07/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 06/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 07/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 08/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 11/05/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations