Dead swan in western Japan found to be infected with highly pathogenic avian influenza H5N6

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Dead swan in western Japan found to be infected with avian flu

November 9, 2017 (Mainichi Japan)

TOKYO (Kyodo) -- The Environment Ministry said Thursday a dead wild swan found at a western Japan lake was infected with a highly pathogenic avian influenza virus, confirming it as the first bird flu case in the country this season.

A detailed examination conducted at Tottori University determined the presence of the H5N6 influenza strain, which has caused severe outbreaks in Japan and Asia in the past, according to the ministry.

The dead mute swan was discovered near Lake Shinji in Matsue, Shimane Prefecture, on Sunday and it tested positive for bird flu in a simple test carried out by the prefectural government.
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https://mainichi.jp/english/articles...0m/0dm/081000c

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Highly pathogenic influenza A viruses (infection with) (non-poultry including wild birds), Japan

Information received on 10/11/2017 from Dr Kazuo Ito, Director, International Animal Health Affairs Office, Animal Health Division, Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan

Summary Report type Immediate notification Date of start of the event 05/11/2017 Date of confirmation of the event 09/11/2017 Report date 10/11/2017 Date submitted to OIE 10/11/2017 Reason for notification Recurrence of a listed disease Date of previous occurrence 08/03/2017 Manifestation of disease Clinical disease Causal agent Highly pathogenic influenza A virus Serotype H5N6 Nature of diagnosis Laboratory (basic), Laboratory (advanced) This event pertains to a defined zone within the country

New outbreaks (1)

Outbreak 1 Matsue-shi, SHIMANE Date of start of the outbreak 05/11/2017 Outbreak status Resolved (05/11/2017) Epidemiological unit Not applicable Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Mute Swan:Cygnus olor(Anatidae) 1 1 0 0

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Mute Swan:Cygnus olor(Anatidae) 1 1 0 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Mute Swan:Cygnus olor(Anatidae) ** ** 100.00% ** *Removed from the susceptible population through death, destruction and/or slaughter **Not calculated because of missing information

Epidemiology Source of the outbreak(s) or origin of infection Unknown or inconclusive Epidemiological comments On 5th November 2017, one Cygnus olor (mute swan) was found dead in Matsue-shi and the sample derived from it was tested positive for influenza A virus by antigen-capture kit. On 9th November 2017, the sample was confirmed positive for H5N6 subtype influenza A virus. Enhanced monitoring of wild birds is ongoing within a ten-kilometer radius of the site. Interviews and on-sight inspection were carried out on poultry farms in the ten kilometer area and no abnormality was found.

Control measures Measures applied Screening Disinfection 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 Tottori University (Private Laboratory) Mute Swan gene sequencing 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan haemagglutination (HA) test 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan haemagglutination inhibition test (HIT) 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan intravenous pathogenicity index (IVPI) test 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan neuraminidase inhibition assay 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan reverse transcription - polymerase chain reaction (RT-PCR) 09/11/2017 Positive Tottori University (Private Laboratory) Mute Swan virus isolation 09/11/2017 Positive

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

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http://www.oie.int/wahis_2/public/wa...reportid=25189