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Published Date: 2004-03-29 23:50:00
Subject: PRO/AH/EDR> Avian influenza - Eastern Asia (57): OIE
Archive Number: 20040329.0862

AVIAN INFLUENZA - EASTERN ASIA (57): OIE
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International Society for Infectious Diseases
<http://www.isid.org>
In this update:
[1] Thailand
[2] South Korea
****
[1] Thailand
Date: 27 Mar 2004
From: ProMED-mail <promed@promedmail.org>
Source: Office International des Epizooties(OIE), Disease Information [edited]
<http://www.oie.int/eng/info/hebdo/a_current>

Highly Pathogenic Avian Influenza in Thailand
-------------------------------------------------
Follow-up report No. 8
See also: 19 Mar 2004, 12 Mar 2004, 5 Mar 2004, 27 Feb 2004, 20 Feb 2004,
13 Feb 2004, 6 Feb 2004, 23 Jan 2004
Information received on 22 Mar 2004 from Dr Yukol Limlamthong, Director
General, Department of Livestock Development, Ministry of Agriculture and
Cooperatives, Bangkok:
End of previous report period: 12 Mar 2004 (see Disease Information, 17
[12], 81, dated 19 Mar 2004).
End of this report period: 19 Mar 2004.
New outbreaks:
Location / No. of outbreaks
Ayutthaya province, Bang Pa-In district, Sanreon sub-district/ 1
Chiangmai province, Sansai district, Sanameng sub-district / 1
Chonburi province, Panusnikom district, Wat Bot sub-district/ 1
Uttaradit province, Mung district, Haad Guard sub-district / 1
Description of affected population in the new outbreaks: layers, ducks.
Total number of animals in the new outbreaks:
species / susceptible / cases / deaths / destroyed / slaughtered
avi / ... / ... / ... / 29 405 / ...
Diagnosis: to enhance efficiency in disease control, the positive cases are
now being based on clinical criteria with laboratory confirmation later.
A. Laboratories where diagnosis was made: National Institute of Animal
Health, Regional Veterinary Research and Development Centres (seven
centres), Department of Livestock Development.
B. Diagnostic tests used:
- virus isolation;
- haemagglutination test;
- agar gel precipitation test;
- intravenous pathogenicity index test.
C. Causal agent: avian influenza virus type A, subtype H5N1, highly pathogenic.
Epidemiology:
A. Source of agent / origin of infection: investigations under way.
B. Mode of spread: horizontal spread by fomites.
Control measures during reporting period:
- stamping out policy;
- quarantine;
- movement control inside the country;
- screening;
- zoning.
Vaccination is prohibited.
******
[2] South Korea
Date: 27 Mar 2004
From: ProMED-mail <promed@promedmail.org>
Source: Office International des Epizooties(OIE), Disease Information [edited]
<http://www.oie.int/eng/info/hebdo/a_current>

Highly Pathogenic Avian Influenza in Korea (Rep. of ~)
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Follow-up report No. 3
See also: 13 Feb 2004, 19 Dec 2003, 12 Dec 2003
Information received on 24 Mar 2004 from Dr Chang-Seob Kim, Chief
Veterinary Officer, Animal Health Division, Ministry of Agriculture and
Forestry (MAF), Gwacheon:
End of previous report period: 6 Feb 2004 (see Disease Information, 17 [7],
38, dated 13 Feb 2004).
End of this report period: 24 Mar 2004.
New outbreaks:
Location Gyeonggi province, Yangju city
No. of outbreaks: 1 farm
Description of affected population in the new outbreak: layer hens.
Total number of animals in the new outbreak:
species / susceptible / cases / deaths / destroyed / slaughtered
avi / 18 808 / ... / 4250 / 14 558 / 0
Diagnosis:
A. Laboratory where diagnosis was made: National Veterinary Research and
Quarantine Service, Anyang, Kyonggi.
B. Diagnostic tests used: PCR(1) and haemagglutination inhibition test;
positive results on 21 Mar 2004.
C. Causal agent: highly pathogenic avian influenza virus subtype H5N1.
Source of agent / origin of infection: not yet known; under investigation.
Control measures during reporting period:
- Every duck or chicken within a 3-km radius of the affected farm has been
culled (about 400 000).
- Movement restrictions have been applied to the affected farm, relevant
hatcheries, and other farms within a 10-km radius of the affected farm.
- Movement restrictions on poultry, feed, manure, egg trays, and instruments.
- Disinfection and extensive surveillance have been performed around the
farms within a 10-km radius of the affected farm.
- Dead and killed poultry have been buried.
- Eggs from hens within a 3-km radius and eggs from ducks within a 10-km
radius of the affected farm have been destroyed.
- An area of a 30- to 40-km radius around the affected farm has been
designated a special surveillance region, and all the poultry farm owners
within this region are telephoned twice a day.
Vaccination is prohibited.
--
ProMED-mail
<promed@promedmail.org>
[Also contained in this week's OIE Disease Information was the same
information from China that ProMED-mail posted in Avian influenza - Eastern
Asia (53) 20040320.0776. While commenting on the value of transparency
exhibited by that report, ProMED-mail also reviews the requirements for
being declared disease free from HPAI. It will take at least 6 months
after the disease has died down and stopped producing new cases.
As indicated above, the occurrence of new outbreaks has not
ended. Surveillance of appropriate population for 6 months is required,
and the surveillance must come after the cessation of new outbreak
cases. In both Thailand and South Korea, we are not there yet because of
outbreaks like the ones reported above. It will obviously be some time yet,
even if we have begun to turn the corner on this disease in Asia. - Mod.PC]

See Also