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Rabbit haemorrhagic disease,
United States of America
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Information received on 23/06/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS,
United States
Department of Agriculture, Washington, United States of America
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Summary
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| Outbreak 1 |
Pima County, Pima, Arizona |
| Date of start of the outbreak |
22/05/2020 |
| 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) |
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1 |
1 |
0 |
0 |
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| Affected population |
Wild Black-tailed jackrabbit (Lepus californicus) |
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| Outbreak 2 |
Sandoval County, Sandoval, New Mexico |
| Date of start of the outbreak |
05/06/2020 |
| Outbreak status |
Continuing (or date resolved not provided) |
| Epidemiological unit |
Backyard |
| Affected animals |
| Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
| Rabbits |
3 |
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2 |
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0 |
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| Affected population |
Non-commercial domestic rabbits (Oryctolagus cuniculus) |
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| Outbreak 3 |
Mohave County, Mohave, Arizona |
| Date of start of the outbreak |
06/06/2020 |
| Outbreak status |
Continuing (or date resolved not provided) |
| Epidemiological unit |
Backyard |
| Affected animals |
| Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
| Rabbits |
10 |
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3 |
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0 |
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| Affected population |
Non-commercial domestic rabbits (Oryctolagus cuniculus) |
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| Outbreak 4 |
Coconino County, Coconino, Arizona |
| Date of start of the outbreak |
10/06/2020 |
| 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) |
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1 |
1 |
0 |
0 |
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| Affected population |
Wild Desert cottontail rabbit (Sylvilagus audubonii) |
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| Summary of outbreaks |
Total outbreaks: 4 |
| Total animals affected |
| Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
| Black-tailed Jackrabbit:Lepus californicus(Leporidae) |
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1 |
1 |
0 |
0 |
| Rabbits |
13 |
** |
5 |
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0 |
| Desert Cottontail:Sylvilagus audubonii(Leporidae) |
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1 |
1 |
0 |
0 |
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| Outbreak statistics |
| Species |
Apparent morbidity rate |
Apparent mortality rate |
Apparent case fatality rate |
Proportion susceptible animals lost* |
| Black-tailed Jackrabbit:Lepus californicus(Leporidae) |
** |
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100.00% |
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| Rabbits |
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38.46% |
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** |
| Desert Cottontail:Sylvilagus audubonii(Leporidae) |
** |
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100.00% |
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| *Removed from the susceptible population through death, destruction and/or slaughter |
| **Not calculated because of missing information |
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Epidemiology
| Source of the outbreak(s) or origin of infection |
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| Epidemiological comments |
Update June 23, 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 the current outbreaks.
Nevada (NV)--Nevada State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreak.
Colorado (CO)--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 one additional non-commercial premises. Total positive premises in Arizona is 33. All affected premises have been quarantined and depopulation has been completed on 12 of the affected premises. Disposal, cleaning and disinfection activities are ongoing.
There have been two new wild rabbit detections of RHDV2 in a Black-tailed jackrabbit (Lepus californicus) from Pima County and a Desert cottontail rabbit (Sylvilagus audubonii) from Coconino County.
Arizona State Animal Health Officials and the USDA, APHIS continue an epidemiological investigation into the current outbreaks.
Texas (TX)--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) on one additional non-commercial premises. Total positive premises in New Mexico is 39. Thirty-eight of the affected premises have been quarantined and depopulation has been completed on 30 of the affected premises. Disposal activities are ongoing. Eight 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, Colorado, California and Texas. In all States, State Animal Health Officials direct the use of the vaccine including record and ID requirements. |
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Control measures
| Measures applied |
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Disinfection
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Quarantine
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Traceability
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Surveillance within containment and/or protection zone
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Vaccination in response to the outbreak (s)
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No treatment of affected animals
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| Measures to be applied |
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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) |
19/06/2020 |
Positive |
| National Veterinary Services Laboratories (National laboratory) |
Desert Cottontail |
reverse transcription - polymerase chain reaction (RT-PCR) |
19/06/2020 |
Positive |
| National Veterinary Services Laboratories (National laboratory) |
Rabbits |
reverse transcription - polymerase chain reaction (RT-PCR) |
18/06/2020 |
Positive |
| National Veterinary Services Laboratories (National laboratory) |
Rabbits |
reverse transcription - polymerase chain reaction (RT-PCR) |
19/06/2020 |
Positive |
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Future Reporting
| The event is continuing. Weekly follow-up reports will be submitted. |
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Map of outbreak locations
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