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Foodborne botulism in Canada, 1985-2005.

Leclair D, Fung J, Isaac-Renton JL, Proulx JF, May-Hadford J, Ellis A, Ashton E, Bekal S, Farber JM, Blanchfield B, Austin JW - Emerging Infect. Dis. (2013)

Bottom Line: Approximately 85% of the outbreaks occurred in Alaska Native communities, particularly the Inuit of Nunavik in northern Quebec and the First Nations population of the Pacific coast of British Columbia.These populations were predominantly exposed to type E botulinum toxin through the consumption of traditionally prepared marine mammal and fish products.Three affected pregnant women delivered healthy infants.

View Article: PubMed Central - PubMed

Affiliation: Health Canada, Ottawa, Ontario, Canada.

ABSTRACT
During 1985-2005, a total of 91 laboratory-confirmed outbreaks of foodborne botulism occurred in Canada; these outbreaks involved 205 cases and 11 deaths. Of the outbreaks, 75 (86.2%) were caused by Clostridium botulinum type E, followed by types A (7, 8.1%) and B (5, 5.7%). Approximately 85% of the outbreaks occurred in Alaska Native communities, particularly the Inuit of Nunavik in northern Quebec and the First Nations population of the Pacific coast of British Columbia. These populations were predominantly exposed to type E botulinum toxin through the consumption of traditionally prepared marine mammal and fish products. Two botulism outbreaks were attributed to commercial ready-to-eat meat products and 3 to foods served in restaurants; several cases were attributed to non-Native home-prepared foods. Three affected pregnant women delivered healthy infants. Improvements in botulism case identification and early treatment have resulted in a reduction in the case-fatality rate in Canada.

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Related in: MedlinePlus

Number of cases of foodborne botulism and disease incidence (rate/100,000 population), Canada, 1985–2005.
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Figure 1: Number of cases of foodborne botulism and disease incidence (rate/100,000 population), Canada, 1985–2005.

Mentions: Of 91 laboratory-confirmed outbreaks (a total of 205 cases), C. botulinum type E was implicated in 75 (86.2%), followed by types A (7, 8.1%) and B (5, 5.7%). Median patient age was 45 years (range 3–80 years); 93 (48.4%) were male. Three cases in the Nunavik region were recorded as repeated episodes of type E botulism, with the second episodes occurring 10–20 years after the initial intoxication. Overall, the number of outbreaks of foodborne botulism did not decrease during the study period, with a mean of 4.3 outbreaks/year. Outbreaks involved 1–37 cases, and 78% of outbreaks involved 1 or 2 cases. Mean annual incidence was 0.03 cases/100,000 population. The annual number of cases was marked by peaks associated with large outbreaks (Figure 1). The number of cases appeared to decrease during the last 5 years of the study period; lower numbers of outbreaks with multiple cases were reported (Table 1).


Foodborne botulism in Canada, 1985-2005.

Leclair D, Fung J, Isaac-Renton JL, Proulx JF, May-Hadford J, Ellis A, Ashton E, Bekal S, Farber JM, Blanchfield B, Austin JW - Emerging Infect. Dis. (2013)

Number of cases of foodborne botulism and disease incidence (rate/100,000 population), Canada, 1985–2005.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3713816&req=5

Figure 1: Number of cases of foodborne botulism and disease incidence (rate/100,000 population), Canada, 1985–2005.
Mentions: Of 91 laboratory-confirmed outbreaks (a total of 205 cases), C. botulinum type E was implicated in 75 (86.2%), followed by types A (7, 8.1%) and B (5, 5.7%). Median patient age was 45 years (range 3–80 years); 93 (48.4%) were male. Three cases in the Nunavik region were recorded as repeated episodes of type E botulism, with the second episodes occurring 10–20 years after the initial intoxication. Overall, the number of outbreaks of foodborne botulism did not decrease during the study period, with a mean of 4.3 outbreaks/year. Outbreaks involved 1–37 cases, and 78% of outbreaks involved 1 or 2 cases. Mean annual incidence was 0.03 cases/100,000 population. The annual number of cases was marked by peaks associated with large outbreaks (Figure 1). The number of cases appeared to decrease during the last 5 years of the study period; lower numbers of outbreaks with multiple cases were reported (Table 1).

Bottom Line: Approximately 85% of the outbreaks occurred in Alaska Native communities, particularly the Inuit of Nunavik in northern Quebec and the First Nations population of the Pacific coast of British Columbia.These populations were predominantly exposed to type E botulinum toxin through the consumption of traditionally prepared marine mammal and fish products.Three affected pregnant women delivered healthy infants.

View Article: PubMed Central - PubMed

Affiliation: Health Canada, Ottawa, Ontario, Canada.

ABSTRACT
During 1985-2005, a total of 91 laboratory-confirmed outbreaks of foodborne botulism occurred in Canada; these outbreaks involved 205 cases and 11 deaths. Of the outbreaks, 75 (86.2%) were caused by Clostridium botulinum type E, followed by types A (7, 8.1%) and B (5, 5.7%). Approximately 85% of the outbreaks occurred in Alaska Native communities, particularly the Inuit of Nunavik in northern Quebec and the First Nations population of the Pacific coast of British Columbia. These populations were predominantly exposed to type E botulinum toxin through the consumption of traditionally prepared marine mammal and fish products. Two botulism outbreaks were attributed to commercial ready-to-eat meat products and 3 to foods served in restaurants; several cases were attributed to non-Native home-prepared foods. Three affected pregnant women delivered healthy infants. Improvements in botulism case identification and early treatment have resulted in a reduction in the case-fatality rate in Canada.

Show MeSH
Related in: MedlinePlus