Rabbit haemorrhagic disease,
United States of America
Information received on 01/06/2020 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. 17
Date of start of the event 08/07/2019
Date of confirmation of the event 17/07/2019
Report date 01/06/2020
Date submitted to OIE 01/06/2020
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 Brewster County, Brewster, Texas
Date of start of the outbreak 14/05/2020
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 2 Cochise County, Cochise, Arizona
Date of start of the outbreak 19/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 8 6 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 3 Cochise County, Cochise, Arizona
Date of start of the outbreak 22/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 4 4 4 0 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 4 Pima County, Pima, Arizona
Date of start of the outbreak 26/05/2020
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 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Outbreak 5 Montezuma County, Montezuma, Colorado
Date of start of the outbreak 29/05/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Rabbits 42 11 0
Affected population Non-commercial domestic rabbits (Oryctolagus cuniculus)
Summary of outbreaks Total outbreaks: 5
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Black-tailed Jackrabbit:Lepus californicus(Leporidae) 1 1 0 0
Rabbits 56 4 ** 22 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Black-tailed Jackrabbit:Lepus californicus(Leporidae) ** ** 100.00% **
Rabbits ** 39.29% ** **
*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 June 1, 2020: California (CA)--California State Animal Health Officials and the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Services (APHIS) continue 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 domestic rabbits (Oryctolagus cuniculus) on one additional non-commercial premises in Montezuma County. Total positive premises in Colorado is two. The affected premises have been quarantined and depopulation is pending. 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 three additional non-commercial premises. Total positive premises in Arizona is 28. All affected premises have been quarantined and depopulation has been completed on 12 of the affected premises. Disposal, cleaning and disinfection activities are ongoing. Arizona State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreaks. Texas (TX)--There has been one new wild rabbit detection of RHDV2 in a Black-tailed jackrabbit (Lepus californicus) from Brewster County. Texas State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreaks. New Mexico (NM)--Of the 33 positive RHDV2 premises in New Mexico, depopulation has been completed on 28 of them. Disposal activities are ongoing. Six of the affected premises have completed cleaning and disinfection activities and continue 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. All affected States have received or are pursuing import of European Union-licensed RHDV2 vaccine for emergency use by special approval of the USDA. Administration of RHDV2 vaccine has begun in New Mexico.
Control measures
Measures applied
  • Vaccination in response to the outbreak (s)
  • Surveillance within containment and/or protection zone
  • Traceability
  • Quarantine
  • Disinfection
  • 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) 29/05/2020 Positive
National Veterinary Services Laboratories (National laboratory) Rabbits reverse transcription - polymerase chain reaction (RT-PCR) 29/05/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations