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 Countries are no longer required to report atypical Bovine Spongiform Encephalopathy (BSE) to the World Organisation for Animal Health (WOAH) following the adoption of a revised standard on the disease by the World Assembly of Delegates at the organization’s 90th General Session in May. Atypical BSE was removed from the list of diseases that require compulsory notification to WOAH in the revised standard as it is a very rare and sporadic condition, with no significant impact on animal or public health. Atypical BSE occurs spontaneously in cattle populations at a very low rate while Classical BSE occurs through the consumption of contaminated feed. Classical BSE was responsible for the BSE epidemic that started in the United Kingdom in 1986. Removing atypical BSE as a listed disease is a signal for trading partners to not impose unwarranted trade restrictions when a case arises, a practice already followed in countries that use science-based animal health policies. Announced in an article in a recent WOAH newsletter, the revised standard for BSE comes as the result of the successful implementation of effective control measures that have helped to eradicate BSE worldwide. Today, the incidence of BSE has dropped to nearly zero and is considered by WOAH to be a disease with contained presence and sanitary impact due to very low occurrence. The revised standard has been updated to align with the current scientific knowledge and evolving epidemiological context. Updates include the criteria for determining disease risk alongside recommendations for disease surveillance and safe trade. The revised standard was first circulated in 2019. BSE has been a reportable disease in Canada since 1990. There have been three cases of atypical BSE reported in Canada: in June 2006 in a beef cow born in 1989 in January 2007 in a beef cow born in 1994 in December 2021 in a beef cow born in 2013. Like all the atypical BSE cases reported worldwide, the cases in Canada were not linked to a common infectious source. Back to main page

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