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Japan, First Case Of
H1N1 Swine Flu In Swine
From Patricia Doyle, PhD
10-23-9
 
PANDEMIC (H1N1) 2009, ANIMAL HEALTH (17): JAPAN (OSAKA) SWINE, OIE
 
OIE, WAHID (World Animal Health Information Database), weekly 
disease information 2009; 22(43) 
Pandemic influenza H1N1 (2009), Japan
 
-------------------------------------
 
Information received on 21 Oct 2009 from Dr Toshiro Kawashima, CVO,  Animal Health Division, Ministry of Agriculture, Forestry and  Fisheries, Tokyo, Japan
 
Summary
 
Report type: immediate notification
Start date: 2 Oct 2009
Date of 1st confirmation of the event: 21 Oct 2009
Report date: 21 Oct 2009
Date submitted to OIE: 21 Oct 2009
Reason for notification: emerging disease
Morbidity: 1 percent
Mortality: 0 percent
Zoonotic impact: no workers in the farm have contracted 
influenza-like illness during at least one month prior to this incident.
Causal agent: pandemic Influenza H1N1 2009
Serotype: other
This event pertains to the whole country
New outbreaks
 
Summary of outbreaks:
Total outbreaks: 1
Outbreak 1: Osaka area, Osaka
Date of start of the outbreak: 2 Oct 2009
Outbreak status: continuing (or date resolved not provided)
Epidemiological unit: farm
Species: swine
Susceptible: 1000
Cases: 10
Deaths: 0
Destroyed: 0
Slaughtered: 0
Affected population: integrated farrow-to-finish farm with 
approximately 100 breeding sows and a total of 1000 pigs.
Outbreak statistics
 
Species: swine
Apparent morbidity rate: 1 percent
Apparent mortality rate: 0 percent
Apparent case fatality rate: 0 percent
Proportion susceptible animals lost*: 0 percent
* Removed from the susceptible population through death, destruction, 
and/or slaughter
Epidemiology
 
Source of the outbreak(s) or origin of infection: under investigation
 
Epidemiological comments: This is the 1st infection of pandemic  Influenza H1N1 2009 in swine in Japan.
 
The infection was detected through surveillance conducted by  prefectural veterinary authority.
 
The virus was isolated from a pool of 10 nasal swabs directly  collected randomly from pigs without clinical signs on 2 Oct 2009. The subtype H1 was confirmed by National Institute of Animal Health  (NIAH) on 20 Oct 2009 while the subtype N1 was confirmed on 21 Oct 2009.
 
The affected farm is under voluntary movement restraint.
 
No abnormalities are observed in pigs within a 10 km [6 mi] radius  around the affected farm.
 
Epidemiological investigations are continuing.
Control measures
Measures applied: movement control inside the country; no  vaccination; no treatment of affected animals Measures to be applied: screening
 
Diagnostic test results
Laboratory name and type: Livestock Hygiene Service Centre in Osaka 
prefecture (local laboratory)
Species: swine
Test: haemagglutination inhibition test (HIT)
Test date: 16 Oct 2009
Result: positive
Species: swine
Test: polymerase chain reaction (PCR) 16/10/2009
Test date: 16 Oct 2009
Result: positive
Laboratory name and type: National Institute of Animal Health 
(national laboratory)
Species: swine
Test: gene sequencing
Test date: 20 Oct 2009
Result: positive
Species: swine
Test: gene sequencing
Test date: 21 Oct 2009
Result: positive
Species: swine
Test: polymerase chain reaction (PCR)
Test date: 19 Oct 2009
Result: positive
Future reporting
The event is continuing. Weekly follow-up reports will be submitted.
 
http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8554
 
--
Communicated by ProMED-mail
promed@promedmail.org
 
The identification of the 1st case of H1N1 in swine in Japan  provides a strong argument for routine, active surveillance in animal  populations when there is human disease actively occurring in the  area. As of last July (2009), Japan had more than 1200 cases in people.
 
The transparency in animal health status displayed in the case is  exemplary. Japan has recently encountered its 8th case of oseltamivir  resistance in people. - Mod PC
 
The location of the outbreak may be seen on the map at the source  URL above and on the HealthMap/ProMED-mail interactive map of Japan  at http://healthmap.org/r/00Xc. - Sr.Tech.Ed.MJ
 
 
Patricia A. Doyle DVM, PhD Bus Admin, Tropical Agricultural Economics Univ of West Indies Please visit my "Emerging Diseases" message board at: http://www.emergingdisease.org/phpbb/index.php Also my new website: http://drpdoyle.tripod.com/ Zhan le Devlesa tai sastimasa Go with God and in Good Health 
 
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