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From: TSS (216-119-156-71.ipset36.wt.net)
Subject: Re: BSE in North America CANADIAN UPDATE as of January 14, 2005 - 12:00 EST
Date: January 14, 2005 at 2:48 pm PST

In Reply to: Re: BSE in North America CANADIAN UPDATE as of January 14, 2005 - 12:00 EST posted by TSS on January 14, 2005 at 2:35 pm:

BOVINE SPONGIFORM ENCEPHALOPATHY IN CANADA
Additional information

See also: 7 January 2005 , 15 August 2003

See Disease Information, 18 (1), 8, dated 7 January 2005

Information received on 12 January 2005 from Dr Brian Evans, Executive Director, Canadian Food Inspection Agency, Ottawa:

Report date: 3 January 2005.

Date of first confirmation of the event: 2 January 2005.

Date of start of the event: 17 December 2004.

Clinical disease: yes.

Nature of diagnosis: laboratory.

Details of outbreak:

First administrative division Lower administrative division Type of epidemio-logical unit Name of the location Latitude Longitude
Alberta Edmonton district farm Barrhead County No. 11 54º 07' 38" N 114º 12' 29" W

MAP

Date of start of the outbreak Species Number of animals in the outbreak
susceptible cases deaths destroyed slaughtered
17 Dec. 2004 bov ... 1 ... 1 0

Description of affected population: the infected animal has been determined to be a Holstein cow aged 98 months. The animal was purchased in March 2000 for use as a family milk cow. The herd of origin where the animal was born and was resident until 1999 has been confirmed.

Diagnosis:

Laboratories where diagnosis was made Diagnostic tests used Date Results
Provincial TSE(1) Laboratory, Edmonton, Alberta ELISA(2) rapid test 28 Dec. 2004 positive
National Centre for Foreign Animal Disease (NCFAD), Winnipeg, Manitoba western blot rapid test 29 Dec. 2004 positive
National Centre for Foreign Animal Disease (NCFAD), Winnipeg, Manitoba immunohistochemical test 2 Jan. 2005 positive

Source of outbreak or origin of infection:

- unknown or inconclusive;

- fomites (humans, vehicles, feed, etc.).

Control measures:

A. Undertaken: quarantine.

B. To be undertaken: stamping out.

Treatment of affected animal: no.

Other details/comments:

The infected animal was born on 5 October 1996, prior to the introduction of the 1997 ruminant feed ban. It is suspected that the animal most likely became infected through the consumption of contaminated feed at an early age while resident in the herd of birth.

No part of the animal entered the human or animal food systems. The carcass has been transported to a federal laboratory facility for incineration. A comprehensive epidemiological investigation is underway.

In accordance with Article 2.3.13.5. of the Terrestrial Animal Health Code , the progeny born to the infected animal within the previous two years have been traced. There was no progeny born in 2004 and the 2003 progeny has been confirmed to have been previously slaughtered. In addition, the birth cohorts of the positive animal born within the 12-month interval of the infected animal which may have been exposed to the same feed sources are also being traced.

All such animals remaining alive will be detained and their movements controlled, and when slaughtered they will be sampled for testing purposes and completely destroyed.

In parallel, a thorough investigation of feed sources on the farm of birth is under way.

(1) TSE: transmissible spongiform encephalopathy

(2) ELISA: enzyme-linked immunosorbent assay

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http://www.oie.int/eng/info/hebdo/a_current.htm#Sec3

TSS

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