Food Microbiology 101
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1 Food Microbiology 101 Nina G. Parkinson NGP Consulting November 6, 2018 Food Safety and Sanitation Conference Summary Microbiological contamination of food Routes of contamination by pathogens Overview on emerging risks Solutions 1
2 Basics of Food Microbiology Not all microorganisms are bad Used to ferment products Necessary for composting organic materials Some cause spoilage Decomposition of foods economic losses Some cause illnesses and diseases Pathogens Types of foodborne illnesses Infections Caused by swallowing living pathogens, which grow within the body and cause illness Intoxications Caused by swallowing toxin (poison) that has been formed in food as pathogens grow Reactions usually occur within hours or days of consumption Secondary conditions attributed to some of these illnesses 2
3 Historical perspective s Clostridium botulinum Salmonella spp. Staphylococcus aureus Worked hard to figure out how they grew, how they caused illnesses, etc. Growth needs Food Acid Temperature Time Oxygen Moisture Some produce toxins Survival skills Sporeformers High temperatures Unpleasant conditions Sanitizer chemicals Low ph Vegetative pathogens Low water activity Low ph Low temperatures 3
4 1950 s to 2000 s and beyond E. coli (many strains and serotypes) E. coli O157:H7 Enterohemorrhagic (EHEC) Enterotoxigenic E. coli (ETEC) Shiga (or Shiga like) Toxin E. coli (STEC) Shigella spp. Clostridium perfringens Vibrio vulnificus Listeria monocytogenes Campylobacter jejuni Bacillus cereus Cronobacter sakazakii Yersinia enterocolitica Parasites: Cryptosporidium, Cyclospora Viruses: Hepatitis A, Norovirus Causes of foodborne illness in U. S. ( ) Cause Annual cases Annual deaths (rate%) Norovirus 5,461, (<0.1%) Salmonella spp. 1,027, (0.5%) Clostridium perfringens 965, (<0.1%) Campylobacter 845, (0.1%) Toxoplasma gondii 86, (0.2%) Listeria monocytogenes 1, (15.9%) 4
5 What happened? Are there more microorganisms? Has technology improved so we can detect them? Are we providing better environments for them to flourish? What has changed? Technology Improvements in testing and identification methods To detect pathogens in the plant environment, in finished products and ingredients To trace back foodborne illness outbreaks Whole Genome Sequencing (WGS) Some are becoming resistant to antimicrobial agents 5
6 What has changed? Consumers Population of sensitive consumers More convenient foods More healthy foods Less knowledge about food safety Population of sensitive consumers > 30 million people in the U.S. Elderly Infants and children Pregnant women Those with weakened immune systems 6
7 More convenient foods Fast Convenient Ready to Eat Minimal heating More eating out / Less home cooking Delivered foods for preparing More healthy foods Want less process (fresher) Less chemicals (clean labels) Healthy Less salt, less sugar, less preservatives 7
8 Less knowledge about food safety Assume food is safe Don t think about food safety (much) Don t read instructions (much) Product Development New, innovative foods So the industry responds Clean labels Minimal processes Fresh foods Ready to Eat foods But they need to make a profit as well 8
9 Global sourcing of ingredients Different standards and specifications Global Food Safety Initiative Some ingredients may be cheaper, but may be contaminated Need to know your specifications and make sure your suppliers meet them Processors Profits = Time = Costs Automation Many facilities are older, harder to clean or maintain properly 9
10 How different foods can get contaminated with microorganisms Raw materials Poor production practices Poor employee practices Dirty equipment Environmental contamination Inadequate temperature controls Recontamination after process Recalls and Regulations Used to recall foods AFTER a foodborne illness outbreak, after epidemiological studies identified the source Now, recall if there is a suspicion of contamination Finished product testing Review of processing procedures Suspect ingredients Environmental testing 10
11 Issues with emerging pathogens Growth is important Dosage Toxin production Survival may be even more important Minimal processed foods may not kill the pathogens Low ph, Aw or temperature may not control the pathogens as well as we suspected Issues with emerging pathogens Contaminated foods may look, smell and taste normal Consumers may not behave as expected Response Avoid contamination in the first place! Know what you re doing and why you re doing it!! 11
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