Highly pathogenic influenza A viruses (infection with) (non-poultry including wild birds),
Information received on 16/12/2020 from Dr Davide Lecchini, Chief Veterinary Officer, Directorate General for Veterinary Health and Veterinary MedicinalProducts (DGSAF), Ministry of Health, ROME, Italy
Report type Immediate notification
Date of start of the event 28/11/2020
Date of confirmation of the event 04/12/2020
Report date 16/12/2020
Date submitted to OIE 16/12/2020
Reason for notification Recurrence of a listed disease
Date of previous occurrence 21/03/2017
Manifestation of disease Clinical disease
Causal agent Highly pathogenic influenza A virus
Serotype H5N5
Nature of diagnosis Clinical, Laboratory (advanced), Necropsy
This event pertains to a defined zone within the country
New outbreaks (1)
Date of start of the outbreak 28/11/2020
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Other
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Common Teal:Anas crecca(Anatidae) 1 0 1 0
Affected population One virus among those detected in common teals (Anas crecca) has been characterized as the H5N5 subtype.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Common Teal:Anas crecca(Anatidae) 1 0 1 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Common Teal:Anas crecca(Anatidae) ** ** 0.00% **
*Removed from the susceptible population through death, destruction and/or slaughter
**Not calculated because of missing information
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments Highly pathogenic influenza H5 viruses belonging to the B clade have been detected in five common teals (Anas crecca), two wigeons (Mareca penelope) and one mallard (Anas platyrhynchos) sampled after being shot in a hunting area in the province of Rovigo (Valle Chiusa, Porto Tolle). The HA sequences of these viruses are closely related to those of HPAI strains currently circulating in Northern Europe. Characterization of the full genome is in progress.
Control measures
Measures applied
  • 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
Experimental Zooprophylactic Institute of the Venezie - Padova (National laboratory) Common Teal polymerase chain reaction (PCR) 04/12/2020 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations