Bhutan - 1 new outbreak of highly pathogenic avian influenza H5N1 in backyard birds in Chukha District (OIE, October 24, 2016)

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Highly pathogenic avian influenza, Bhutan

Information received on 24/10/2016 from Dr Tashi Samdup, Director General, Department of Livestock, Ministry of Agriculture and Forests, Thimphu, Bhutan

Summary Report type Immediate notification Date of start of the event 10/10/2016 Date of confirmation of the event 20/10/2016 Report date 24/10/2016 Date submitted to OIE 24/10/2016 Reason for notification Reoccurrence of a listed disease Date of previous occurrence 11/2015 Manifestation of disease Clinical disease Causal agent Highly pathogenic avian influenza virus Serotype H5N1 Nature of diagnosis Laboratory (basic), Laboratory (advanced) This event pertains to a defined zone within the country

New outbreaks (1)

Outbreak 1 Alubari, Wangkha, Bjabcho, CHHUKHA Date of start of the outbreak 10/10/2016 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 3000 13 13 61 0 Affected population Affected population is backyard poultry in one household.

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Destroyed Slaughtered Birds 3000 13 13 61 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 0.43% 0.43% 100.00% 2.47% *Removed from the susceptible population through death, destruction and/or slaughter

Epidemiology Source of the outbreak(s) or origin of infection Unknown or inconclusive Epidemiological comments The outbreak has occurred in a backyard, free-ranging poultry population. While interviewing the owners of the birds, none of them mentioned source of infection. Further investigation on the source of infection will be followed-up. Only a small number of birds in an isolated pocket was affected. No further infection in flocks in close proximity was detected.

Control measures Measures applied Movement control inside the country Screening Disinfection / Disinfestation Dipping / Spraying Quarantine Stamping out Zoning 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 National Centre for Animal Health, Serbithang, Thimphu (National laboratory) Birds real-time PCR 13/10/2016 Positive National Institute of High Security Animal Diseases (NIHSAD), Bhopal, India (OIE Reference Laboratory) Birds real-time PCR 20/10/2016 Positive

Future Reporting The event is continuing. Weekly follow-up reports will be submitted.

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