United States of America
Information received on 06/11/2020 from Dr Mark Davidson, Associate Administrator, USDA-APHIS, United States Department of Agriculture, Washington, United States of America
Report type Follow-up report No. 24
Date of start of the event 27/03/2020
Date of confirmation of the event 04/04/2020
Report date 06/11/2020
Date submitted to OIE 06/11/2020
Reason for notification Emerging disease
Morbidity 2 (scale 0 to 5)
Mortality 1 (scale 0 to 5)
Zoonotic impact Zoonotic potential currently unknown
Causal agent SARS-CoV-2/COVID-19
Related reports Immediate notification (06/04/2020)
Follow-up report No. 1 (17/04/2020)
Follow-up report No. 2 (22/04/2020)
Follow-up report No. 3 (29/04/2020)
Follow-up report No. 4 (02/06/2020)
Follow-up report No. 5 (03/06/2020)
Follow-up report No. 6 (10/06/2020)
Follow-up report No. 7 (25/06/2020)
Follow-up report No. 8 (02/07/2020)
Follow-up report No. 9 (09/07/2020)
Follow-up report No. 10 (17/07/2020)
Follow-up report No. 11 (23/07/2020)
Follow-up report No. 12 (30/07/2020)
Follow-up report No. 13 (05/08/2020)
Follow-up report No. 14 (13/08/2020)
Follow-up report No. 15 (20/08/2020)
Follow-up report No. 16 (27/08/2020)
Follow-up report No. 17 (02/09/2020)
Follow-up report No. 18 (10/09/2020)
Follow-up report No. 19 (24/09/2020)
Follow-up report No. 20 (02/10/2020)
Follow-up report No. 21 (09/10/2020)
Follow-up report No. 22 (16/10/2020)
Follow-up report No. 23 (30/10/2020)
Follow-up report No. 24 (06/11/2020)
Follow-up report No. 25 (16/11/2020)
New outbreaks (1)
Outbreak 1 Knox County, Knox, Tennessee
Date of start of the outbreak 12/10/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Zoo
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Tiger:Panthera tigris(Felidae) 3 3 0 0 0
Affected population Adult tigers in a zoo
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Tiger:Panthera tigris(Felidae) 3 3 0 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Tiger:Panthera tigris(Felidae) 100.00% 0.00% 0.00% 0.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Suspected human transmission
Epidemiological comments 6 Nov 2020 Update-- Tennessee (TN): Two Malayan tigers at a zoo were confirmed positive for SARS-CoV-2 at the National Veterinary Services Laboratories based upon molecular testing (PCR and sequencing). The affected tigers exhibited clinical signs, including mild coughing, lethargy and inappetence. A third tiger, who was also showing clinical signs, was sampled and results are pending. It is likely that the SARS-CoV-2 virus was transmitted to the tigers by an infected human. All tigers are progressively recovering and were removed from public exhibition at the onset of clinical signs. There are no other suspected cases of SARS-CoV-2 in any animals from the zoo at this time.
Control measures
Measures applied
  • Quarantine
  • Disinfection
  • 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) Tiger gene sequencing 30/10/2020 Positive
National Veterinary Services Laboratories (National laboratory) Tiger real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 30/10/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations