Vietnam - 1 new outbreak of highly pathogenic avian influenza H5N6 in backyard birds, Lai Chau Province (OIE, November 28, 2015)

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Highly pathogenic avian influenza, Vietnam

Information received on 28/11/2015 from Dr Dong Pham Van, Director General, Chief Veterinary Officer, Department of Animal Health, Ministry of Agriculture and Rural Development, Hano?, Vietnam

Summary Report type Follow-up report No. 17 Date of start of the event 18/08/2015 Date of confirmation of the event 19/08/2015 Report date 28/11/2015 Date submitted to OIE 28/11/2015 Reason for notification Reoccurrence of a listed disease Date of previous occurrence 08/2015 Manifestation of disease Clinical disease Causal agent Highly pathogenic avian influenza virus Serotype H5N6 Nature of diagnosis Clinical, Laboratory (advanced) This event pertains to a defined zone within the country Related reports Immediate notification (20/08/2015) Follow-up report No. 1 (31/08/2015) Follow-up report No. 2 (11/09/2015) Follow-up report No. 3 (14/09/2015) Follow-up report No. 4 (30/09/2015) Follow-up report No. 5 (03/10/2015) Follow-up report No. 6 (13/10/2015) Follow-up report No. 7 (13/10/2015) Follow-up report No. 8 (20/10/2015) Follow-up report No. 9 (24/10/2015) Follow-up report No. 10 (27/10/2015) Follow-up report No. 11 (28/10/2015) Follow-up report No. 12 (02/11/2015) Follow-up report No. 13 (03/11/2015) Follow-up report No. 14 (13/11/2015) Follow-up report No. 15 (17/11/2015) Follow-up report No. 16 (23/11/2015) Follow-up report No. 17 (28/11/2015) Follow-up report No. 18 (30/11/2015)

New outbreaks (1)

Outbreak 1 Quyet Thang, Quyet Thang, Lai Chau, LAI CHAU Date of start of the outbreak 19/11/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 3604 1600 600 3004 0

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Destroyed Slaughtered Birds 3604 1600 600 3004 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 44.40% 16.65% 37.50% 100.00% *Removed from the susceptible population through death, destruction and/or slaughter

Epidemiology Source of the outbreak(s) or origin of infection Unknown or inconclusive

Control measures Measures applied Disinfection / Disinfestation Surveillance outside containment and/or protection zone Stamping out Surveillance within containment and/or protection zone No vaccination No treatment of affected animals Measures to be applied No other measures

Diagnostic test results Laboratory name and type Species Test Test date Result Regional Animal Health Office 1 (RAHO 1) (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 23/11/2015 Positive

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

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