Archived - Bacterial Pathogens, Viruses and Parasites in Various Food Commodities - April 1, 2016 to March 31, 2019
This page has been archived
Information identified as archived is provided for reference, research or record-keeping purposes. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived. Please contact us to request a format other than those available.
Food microbiology- Targeted surveys - Interim report
Summary
While the food we eat in Canada is among the safest in the world, the consumption of food contaminated with foodborne pathogens (bacteria, viruses and parasites) can cause foodborne illness. It has been estimated that approximately 4 million (1 in 8) Canadians are affected by foodborne illnesses each year.
Targeted surveys are one of several surveillance activities that the Canadian Food Inspection Agency (CFIA) conducts on the Canadian food supply. The purpose of targeted surveys is to generate baseline information on the occurrence of microorganisms in food. Targeted surveys can vary in duration from several months to several years depending on the objective of each survey.
The food commodities included in this report are commonly consumed by Canadians across various age groups. Unfortunately, most of these types of foods have been associated with recalls and outbreaks of foodborne illnesses in the past. There are numerous points in the food production chain where contamination with pathogens can occur such as during production, processing, packaging and distribution. Given that most of the commodities covered by this report are consumed without further preparation, the presence of pathogens creates a potential risk for foodborne illnesses.
The purpose of this interim report is to provide preliminary results related to on-going surveys that the CFIA is currently conducting on the following commodities:
- flavoured refrigerated milk
- dairy ice cream
- various cheese products
- raw ground meats (beef, veal, lamb)
- refrigerated ready-to-eat (RTE) liver pâté
- refrigerated RTE sliced/shredded lunch meat
- fully cooked, RTE refrigerated chicken or turkey breast strips
- refrigerated RTE fish and seafood products
- domestic and imported stone fruits
- imported fresh berries
- imported fresh leafy herbs
- RTE fresh-cut fruits
- domestic and imported, conventional and organic fresh baby leafy vegetables
- fresh seed sprouts and microgreens
- frozen pre-packaged cut fruits and berries
- frozen cut fruit and vegetable blends and leafy green vegetables for smoothies
- imported frozen cut fruits
- powdered infant cereal
- conventional and organic dried ground spices
- raw plain oats
From April 1, 2016 to March 31, 2019, 18,040 samples of the above listed commodities were collected from retail locations in 11 cities across Canada and tested for various pathogens. Almost all (98.7%, 17801/18040) of the samples were assessed as satisfactory, while 1.2% (218/18040) were assessed as investigative and 0.1% (21/18040) were assessed as unsatisfactory. Most of the surveys covered in this report have a >99% satisfactory rate to date, with the exceptions being:
- flavoured refrigerated milk (97.9% satisfactory)
- raw ground meats (beef (98.8% satisfactory), veal (92.4% satisfactory), lamb (80.4% satisfactory))
- domestic and imported stone fruits (98.7% satisfactory)
- RTE fresh-cut fruits (98.6% satisfactory)
- fresh seeds sprouts and microgreens (98.6%% satisfactory)
- frozen pre-packaged cut fruits and berries (98.6% satisfactory)
- frozen cut fruit and vegetable blends and leafy green vegetables for smoothies (98.3% satisfactory)
- powdered infant cereal (96.9% satisfactory)
CFIA conducted appropriate follow-up activities for samples that were assessed as investigative or unsatisfactory. These follow-up activities may have included additional facility inspections, product recalls and additional sampling. There have been no reported illnesses linked to the contaminated products.
It is important to note that the assessments reported herein are preliminary as the targeted surveys are still underway and consequently, no conclusions can be drawn at this time. It is unlikely, but possible that the assessments may be adjusted if any policy or regulatory change occurs with respect to a particular food/hazard combination. This report is being provided as a proactive means of sharing a snapshot of the work conducted to date. Final reports containing further details and a full analysis of the results will be made available in the coming years as the surveys are completed.
What are targeted surveys
Targeted surveys are used by the CFIA to focus its surveillance activities on areas of highest health risk. The information gained from these surveys provides support for the allocation and prioritization of the agency' activities to areas of greater concern. Originally started as a project under the Food Safety Action Plan (FSAP), targeted surveys have been embedded in the CFIA' regular surveillance activities since 2013. Targeted surveys are a valuable tool for generating information on certain hazards in foods, identifying and characterizing new and emerging hazards, informing trend analysis, prompting and refining health risk assessments, highlighting potential contamination issues, as well as assessing and promoting compliance with Canadian regulations.
Food safety is a shared responsibility. CFIA works with federal, provincial, territorial and municipal governments and provides regulatory oversight of the food industry to promote safe handling of foods throughout the food production chain. The food industry and retail sectors in Canada are responsible for the food they produce and sell, while individual consumers are responsible for the safe handling of the food they have in their possession.
What is an interim report
Targeted surveys can vary in duration from several months to several years depending on the objective of each survey. The purpose of this interim report is to provide preliminary results related to on-going surveys that the CFIA is currently conducting.
Will the CFIA publish final reports
Yes, upon conclusion of the surveys, final reports will be made publically available on the CFIA website.
What foods did we test and why
The commodities listed below were selected for targeted surveys to gather baseline information on the occurrence of pathogens (bacteria, viruses and parasites) in these foods. They are all commonly consumed by Canadians of all agesFootnote 1. Unfortunately, most of these types of commodities have been associated with recalls and outbreaks of foodborne illnesses in the past, as they can become contaminated with pathogens during various points in the food production process (production, processing, packaging, distribution). Given that most of the commodities covered by this report are consumed without further preparation, the presence of pathogens in them creates a potential risk for foodborne illnesses.
- flavoured refrigerated milk
- dairy ice cream
- various cheese products
- raw ground meats (beef, veal, lamb)
- refrigerated RTE liver pâté
- refrigerated RTE sliced/shredded lunch meat
- fully cooked, RTE refrigerated chicken or turkey breast strips
- refrigerated RTE fish and seafood products
- domestic and imported stone fruits
- imported fresh berries
- imported fresh leafy herbs
- ready-to-eat fresh-cut fruits
- domestic and imported, conventional and organic fresh baby leafy vegetables
- fresh seed sprouts and microgreens
- frozen pre-packaged cut fruits and berries
- frozen cut fruit and vegetable blends and leafy green vegetables for smoothies
- imported frozen cut fruits
- powdered infant cereal
- conventional and organic dried ground spices
- raw plain oats
What, when and from where did we sample
All samples were collected from national retail chains and local/regional grocery stores located in 11 major cities across Canada. These cities encompassed 4 geographical areas:
- Atlantic (Halifax, Saint John)
- Quebec (Quebec City, Montreal)
- Ontario (Toronto, Ottawa)
- West (Vancouver, Kelowna, Calgary, Saskatoon, Winnipeg).
A sample consisted of a single or multiple unit(s) (individual consumer-size package(s)) from a single lot with a sufficient total weight to conduct all analyses (approximately 250g).
Samples were collected between April 1 and March 31 of the year(s) in which the targeted surveys were conducted.
How many samples have been collected and what have they been tested for
The number of samples collected for each targeted survey and the microorganisms (bacteria, viruses and parasites) for which they were tested are outlined in table 1.
Anticipated targeted survey period -fiscal year(s) | Commodity | Total number of samples collected and tested to March 31, 2019 | Microorganisms tested |
---|---|---|---|
2017/2018 to 2019/2020 | Flavoured refrigerated milk | 1198 | Listeria monocytogenes (L. monocytogenes), aerobic colony count (ACC) |
2017/2018 to 2019/2020 | Dairy ice cream | 786 | L. monocytogenes, ACC |
2018/2019 to 2019/2020 | Soft cheese with spices or other flavouring ingredients | 578 | L. monocytogenes, Salmonella species (spp.), Staphylococcus aureus (S. aureus), generic Escherichia coli (E. coli) |
2018/2019 to 2019/2020 | Single serve cheese | 295 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2018/2019 to 2019/2020 | Sliced cheese | 592 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2018/2019 to 2019/2020 | Shredded/grated cheese | 599 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2016/2017 | Raw ground beef | 589 | E. coli O157, non-O157 Verotoxigenic E. coli (non-O157 VTEC) |
2017/2018 to 2019/2020 | Raw ground veal | 940 | E. coli O157, non-O157 VTEC, generic E. coli, Salmonella spp. in first 100 samples |
2018/2019 to 2019/2020 | Raw ground lamb | 194 | E. coli O157, non-O157 VTEC, generic E. coli |
2018/2019 to 2019/2020 | Refrigerated RTE liver pâté | 299 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2018/2019 to 2019/2020 | Refrigerated RTE sliced/shredded lunch meat | 595 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2018/2019 to 2019/2020 | Fully cooked, RTE refrigerated chicken or turkey breast strips | 595 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli, |
2018/2019 to 2019/2020 | Refrigerated RTE fish and seafood products | 300 | L. monocytogenes, Salmonella spp., S. aureus, generic E. coli |
2016/2017 and 2018/2019 to 2019/2020 | Imported stone fruits | 1175 | Generic E. coli, E. coli O157, Salmonella spp., L. monocytogenes, Shigella |
2016/2017 and 2018/2019 to 2019/2020 | Domestic stone fruits | 778 | Generic E. coli, E. coli O157, Salmonella spp., L. monocytogenes, Shigella |
2017/2018 to 2019/2020 | Imported fresh berries | 773 | Cyclospora, Cryptosporidium, Toxoplasma |
2017/2018 to 2018/2019 | Imported fresh leafy herbs | 771 | Cyclospora, Cryptosporidium, Toxoplasma |
2017/2018 | Imported fresh leafy herbs | 799 | Hepatitis A virus (HAV), Norovirus (NoV) (Genotype I and II (GI, GII)) |
2017/2018 to 2019/2020 | RTE fresh-cut fruits | 765 | HAV, NoV (GI, GII) |
2018/2019 to 2019/2020 | Domestic and imported, organic and conventional fresh baby leafy vegetables | 1060 | L. monocytogenes, Salmonella spp., E. coli O157, generic E. coli |
2018/2019 to 2019/2020 | Fresh seed sprouts and microgreens | 1189 | L. monocytogenes, Salmonella spp., E. coli O157, generic E. coli |
2017/2018 to 2019/2020 | Frozen pre-packaged cut fruits and berries | 1592 | L. monocytogenes, Salmonella spp., E. coli O157, generic E. coli, ACC |
2018/2019 to 2019/2020 | Frozen cut fruit and vegetable blends and leafy green vegetables for smoothies | 118 | L. monocytogenes, Salmonella spp., E. coli O157, generic E. coli, ACC |
2018/2019 to 2019/2020 | Imported frozen cut fruits | 285 | HAV, NoV (GI, GII) |
2018/2019 | Powdered infant cereal | 162 | Enterobacteriaceae |
2018/2019 to 2019/2020 | Dried ground spices | 893 | Generic E. coli, Salmonella spp., Bacillus cereus (B. cereus), Clostridium Perfringens (C. perfringens), S. aureus |
2018/2019 to 2019/2020 | Raw plain oats | 120 | Salmonella spp., E. coli O157, B. cereus, C. perfringens, S. aureus, generic E. coli |
What analytical methods were used and how were samples assessed
Samples were analyzed using methods published in Health Canada's Compendium of Analytical Methods for the Microbiological Analysis of FoodsFootnote 2 and CFIA internally-developed methods.
The assessment criteria (table 2) are based on the principles of Health Canada' Health Products and Food Branch Standards and Guidelines for Microbiological Safety of FoodsFootnote 3 or in the absence of Health Canada' Guidelines, on other international food safety authorities' microbiological guidelinesFootnote 4Footnote 5Footnote 6. The assessment guidelines for L. monocytogenes are based on Health Canada' Policy on Listeria monocytogenes in RTE foodsFootnote 7 and are dependent upon the sample type analysed (Category 1, 2A or 2B). The assessment guidelines for E. coli O157 in raw meats are based on Health Canada' Guidance Document on E. coli O157:H7 and E. coli O157:Nm in Raw Ground BeefFootnote 8.
No assessment guidelines had been established in Canada for the presence ofACC, generic E. coli, Salmonella spp., Shigella, E. coli O157, or non-O157 VTEC in some food commodities at the time of writing this report. As Salmonella spp., Shigella and E. coli O157 are considered pathogenic to humans their presence was considered to be a violation of the Food and Drugs Act (FDA) Section 4(1)aFootnote 9 and therefore in the absence of assessment guidelines, was assessed by the CFIA as unsatisfactory. The detection of non-O157 VTEC was assessed as investigative, indicating that further follow-up actions may be warranted depending upon the virulence profileFootnote 10 (such as the serotype and associated virulence gene(s)) identified.
Unlike harmful bacterial pathogens (e.g. Salmonella, E. coli O157), generic E. coli and enterobacteriaceae are commonly found in the intestines of humans and animals and most strains are harmless. Similarly, ACC is the total number of generally harmless bacteria that are able to grow in an oxygenated (aerobic) environment. ACC are normal components of the environment and can be found in soil and natural water sources. Generic E. coli, enterobacteriaceae and ACC are considered to be indicator organisms and their levels present in a food product are used to assess the overall sanitation conditions throughout the food chain from production to the point of sale. Their presence at some levels is tolerated. An investigative assessment which may result in further follow-up actions is associated with elevated levels (table 2). As the results are based on the analysis of one unit (n=1), further sampling may be required to verify their levels in the lot. An unsatisfactory assessment is associated with the presence of high levels of these organisms (table 2) as it may indicate a breakdown in Good Agricultural Practices, or Good Manufacturing Practices (sanitation practices), and therefore possibly warranting the initiation of follow-up activities to, for example, improve sanitation conditions along the food chain.
Analysis | Commodity | Satisfactory assessment | Investigative assessment | Unsatisfactory assessment |
---|---|---|---|---|
ACC | Flavoured refrigerated milk | ≤5x104 colony forming units (CFU)/mL | >5x104 and ≤106 CFU/mL | >106 CFU/mL |
ACC | Dairy ice cream | ≤105 CFU/g | >105 and ≤106 CFU/g | >106 CFU/g |
ACC | Frozen pre-packaged cut fruits and berries & frozen cut fruit and vegetable blends and leafy green vegetables for smoothies | ≤104 CFU/g | >104 CFU/g | N/A |
B. cereus | Dried ground spices | ≤104 CFU/g | >104 and ≤106 CFU/g | >106 CFU/g |
B. cereus | Raw plain oats | ≤104 CFU/g | >104 CFU/g | N/A |
C. perfringens | Dried ground spices | ≤104 CFU/g | >104 and ≤106 CFU/g | >106 CFU/g |
C. perfringens | Raw plain oats | ≤104 CFU/g | >104 CFU/g | N/A |
E. coli O157 | All commodities tested for E. coli O157 | Not detected | N/A | Detected |
Enterobacteriaceae | Powdered infant cereal | Not detected | >10 most probable number(MPN)/g | N/A |
Generic E. coli | Cheese (soft with spices or other flavourings, single serve, sliced, shredded/grated) | ≤ 102 CFU/g | >102 and ≤2x103 CFU/g | >2x103 CFU/g |
Generic E. coli | Fully cooked RTE chicken/turkey breast strips | ≤ 10 CFU/g | >10 and ≤103 CFU/g | >103 CFU/g |
Generic E. coli | Raw plain oats | ≤102 CFU/g | >102 CFU/g | N/A |
Generic E. coli | Raw ground lamb, and veal | ≤100 CFU/g | >100 CFU/g | N/A |
Generic E. coli | All other commodities tested for generic E. coli | ≤ 102 CFU/g | >102 and ≤103 CFU/g | >103 CFU/g |
L. monocytogenes | category 1 product Note de tableau a | Not detected | N/A | Detected |
L. monocytogenes | category 2A and B product Note de tableau a | Not detected | Detected and ≤102 CFU/g | >102 CFU/g |
L. monocytogenes | Fresh baby leafy vegetables, Fresh seed sprouts & microgreens, Stone fruits, whole wheat |
Not detected | Detected | N/A |
Non-O157 VTEC | Raw ground lamb, beef, and veal, wheat flour | Not detected | Detected | N/A |
Salmonella spp. | All food samples tested for Salmonella spp. | Not detected | N/A | Detected |
Shigella spp. | Stone fruits | Not detected/25g | N/A | Detected/25g |
S. aureus | All food samples tested for S.aureus | ≤102 CFU/g | >102 and ≤104 CFU/g | >104 CFU/g |
S. aureus | Raw plain oats | ≤104 CFU/g | >104 CFU/g | N/A |
Footnote
- Footnote a
-
The pH and water activity of the sample were used to determine product category
At the time of writing this report, no assessment guidelines had been established in Canada for viruses and parasites in whole or fresh-cut produce. In addition, the analytical methods used to analyse the samples detect the presence of viral RNA and parasite DNA and cannot discriminate between viable (potentially infectious) from non-viable (non-infectious) viruses and parasites. Consequently, the detection of viral RNA or parasite DNA was assessed as investigative indicating that further consideration is warranted to determine which follow-up activities would be the most appropriate (table 3).
Analysis | Satisfactory assessment | Investigative assessment | Unsatisfactory assessment |
---|---|---|---|
Cryptosporidium | Not detected | Detected | N/A |
Cyclospora | Not detected | Detected | N/A |
Giardia | Not detected | Detected | N/A |
HAV | Not detected | Detected | N/A |
NoV (GI and GII) | Not detected | Detected | N/A |
What were the survey results
Results of the targeted surveys (as of March 31, 2019) can be found in table 4.
Commodity | Total number of samples tested to March 31, 2019 | Satisfactory (S) | Investigative (I) | Unsatisfactory (U) | Results |
---|---|---|---|---|---|
Flavoured refrigerated milk | 1198 | 1173 (97.9%) |
12 (1.0%) |
13 (1.1%) |
I = ACC >105 and ≤106 CFU/g (12) U = ACC >106 CFU/g (13) |
Dairy ice cream | 786 | 781 (99.4%) |
3 (0.4%) |
2 (0.3%) |
I = ACC >105 and ≤106 CFU/g (3) U = ACC >106 CFU/g (2) |
Cheese (Soft with flavourings, single serve, sliced, or shredded) | 2064 | 2064 (100.0%) |
0 | 0 | All Satisfactory |
Raw ground beef | 589 | 582 (98.8%) |
7 (1.2%) |
0 | I = non-O157 VTEC (7) |
Raw ground veal | 940 | 869 (92.4%) |
68 (7.2%) |
2 (0.2%) |
I = non-O157 VTEC (38) I = non-O157 VTEC and generic E. coli >102 CFU/g (5) I = Salmonella spp.(6) I = generic E. coli >102 CFU/g (20) U = E. coli O157 (2) Note: 1 sample could not be assessed |
Raw ground lamb | 194 | 156 (80.4%) |
37 (19.1%) |
1 (0.5%) |
I = non-O157 VTEC (36) I = non-O157 VTEC and generic E. coli >100 CFU/g (1) U = E. coli O157 |
Refrigerated RTE liver pâté | 299 | 299 (100.0%) |
0 | 0 | All Satisfactory |
Refrigerated RTE sliced/shredded lunch meat | 595 | 595 (100.0%) |
0 | 0 | All Satisfactory |
Fully cooked, RTE refrigerated chicken or turkey breast strips | 595 | 595 (100.0%) |
0 | 0 | All Satisfactory |
Refrigerated RTE fish and seafood products | 300 | 299 (99.7%) |
0 | 1 (0.3%) |
U = generic E. coli >103 CFU/g |
Imported stone fruit | 1175 | 1158 (98.6%) |
16 (1.4%) |
1 (<0.1%) |
I = L. monocytogenes (15) I = generic E. coli >102 and ≤103 CFU/g (1) U = L. monocytogenes (pH and Aw indicate that sample is a Category 1 product) |
Domestic stone fruit | 778 | 770 (99.0%) |
8 (1.0%) |
0 | I = L. monocytogenes |
Imported fresh berries | 773 | 772 (99.9%) |
1 (0.1%) |
N/A | I = Toxoplasma |
Imported fresh leafy herbs | 771 | 771 (100%) |
N/A | N/A | All Satisfactory |
Imported fresh leafy herbs | 799 | 798 (99.9%) |
1 (0.1%) |
N/A | I = NoV (GII) |
RTE fresh-cut fruits | 765 | 754 (98.6%) |
11 (1.4%) |
N/A | I = HepA (5) I = NoV(G1) (4) I = NoV(GII) (2) |
Fresh baby leafy vegetables | 1060 | 1053 (99.3%) |
7 (0.7%) |
0 | I = L. monocytogenes (5) I = generic E. coli >102 and ≤103 CFU/g (2) |
Fresh seed sprouts and microgreens | 1189 | 1172 (98.6%) |
17 (1.4%) |
0 | I = L. monocytogenes (15) I = generic E. coli >102 and ≤103 CFU/g (2) |
Frozen pre-packaged cut fruits and berries | 1592 | 1570 | 22 | 0 | I = ACC >104 CFU/g |
Frozen cut fruit and vegetable blends and leafy green vegetables for smoothies | 118 | 116 (98.6%) |
2 (1.4%) |
0 | I = ACC >104 CFU/g |
Imported frozen cut fruits | 570 | 569 (99.8%) |
1 (0.1%) |
N/A | I = NoV (GI) |
Powdered infant cereal | 162 | 157 (96.9%) |
5 (3.1%) |
N/A | I = Enterobacteriaceae |
Dried ground spices | 893 | 892 (99.9%) |
0 | 1 (0.1%) |
U = Salmonella spp. detected |
Raw plain oats | 120 | 120 (100.0%) |
0 | 0 | All Satisfactory |
Grand Total | 18040 | 17801 (98.7%) |
218 (1.2%) |
21 (0.1%) |
N/A |
What do the survey results mean and what are they used for
Interim results show that almost all (98.7%, 17801/18040) of the samples were assessed as satisfactory, while 1.2% (218/18040) were assessed as investigative and 0.1% (21/18040) were assessed as unsatisfactory. Most of the surveys covered in this report have a >99% satisfactory rate to date, with the only exceptions being:
- flavoured refrigerated milk (97.9% satisfactory)
- raw ground meats (beef (98.8% satisfactory), veal (92.4% satisfactory), lamb (80.4% satisfactory))
- domestic and imported stone fruits (98.7% satisfactory)
- RTE fresh-cut fruits (98.6% satisfactory)
- fresh seeds sprouts and microgreens (98.6%% satisfactory)
- frozen pre-packaged cut fruits and berries (98.6% satisfactory)
- frozen cut fruit and vegetable blends and leafy green vegetables for smoothies (98.3% satisfactory)
- powdered infant cereal (96.9% satisfactory)
CFIA conducted appropriate follow-up activities for samples that were assessed as investigative or unsatisfactory. These follow-up activities may have included additional facility inspections, product recalls and additional sampling. There have been no reported illnesses linked to the contaminated products.
It is important to note that the assessments reported herein are preliminary as the targeted surveys are still underway and consequently, no conclusions can be drawn at this time. It is unlikely, but possible that the assessments may be adjusted if any policy or regulatory change occurs with respect to a particular food/hazard combination. This report is being provided as a proactive means of sharing a snapshot of the work conducted to date. Final reports containing further details and a full analysis of the results will be made available in the coming years as the surveys are completed.
Surveillance testing results will be used by the CFIA to inform risk management decisions and to support program design and re-design.- Date modified: