OIE: Highly pathogenic avian influenza, Japan

OIE: Highly pathogenic avian influenza, Japan
submited by kickingbird at Dec, 21, 2010 7:53 AM from OIE

Information received on 20/12/2010 from Dr Toshiro Kawashima, CVO, Animal Health Division, Ministry of Agriculture, Forestry and Fisheries, Tokyo , Japan

Summary

Report type	Immediate notification
Start date	16/12/2010
Date of first confirmation of the event	19/12/2010
Report date	20/12/2010
Date submitted to OIE	20/12/2010
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	01/04/2009
Manifestation of disease	Clinical disease
Causal agent	Highly pathogenic avian inluenza virus
Serotype	H5
Nature of diagnosis	Clinical, Laboratory (basic), Laboratory (advanced), Necropsy
This event pertains to	the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Location(s)

TOYAMA (Takaoka kojo(Old Castle) Park Zoo, Kojo, Takaoka city)

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Wild species	14	4	4	10	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Wild species	28.57%	28.57%	100.00%	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

Epidemiological comments

It is confirmed on 19 December 2010 that a captive wild mute swan (Cygnus olor) in Toyama prefecture was infected with HPAI. On 16 December 2010, a staff member of the Takaoka Old Castle Park Zoo found out the death of two mute swans in a moat. The local veterinary service centre in the prefecture confirmed a sample taken from the dead birds was influenza A virus positive by antigen-capture kits on the same day. On 19 December 2010, the National Institute of Animal Health affirmed by HI test that the case was due to influenza A virus subtype H5 and found that the amino acid sequence of the connecting peptide of the haemagglutinin was the same as known highly pathogenic avian influenza. Neuraminidase inhibition assay are being carried out. On 20 December 2010, the institute confirmed the case as highly pathogenic avian influenza because the isolate caused 75 % mortality in 4-week-old chickens infected intravenously. The isolate is a closely-related strain with the viruses isolated from faeces of migratory wild ducks in Hokkaido in October 2010 and the cases occurred in Shimane prefecture in November 2010. The zoo destroyed all captive wild birds kept in the moat for its own prevention on 18 December 2010. Although a total of 4 dead birds are found out, 3 out of them were negative by antigen-capture kits.

Control measures

Measures applied	Stamping out Disinfection of infected premises/establishment(s) Vaccination prohibited No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

Laboratory name and type

Local livestock hygene service center (Local laboratory)

Tests and results

Species	Test	Test date	Result
other species	virus isolation	18/12/2010	Positive

Laboratory name and type

National Institute of Animal Health (National laboratory)

Tests and results

Species	Test	Test date	Result
other species	gene sequencing	19/12/2010	Positive
other species	haemagglutination inhibition test (HIT)	19/12/2010	Positive
other species	intravenous pathogenicity index (IVPI) test	20/12/2010	Positive

Future Reporting

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

See Also:

http://www.oie.int

Latest news in those days:

[Go Top] [Close Window]