Risky or Not?

A short podcast about everyday risks from germs

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A large, square glass jar of chimichurri sits on a kitchen counter. The contents appear separated and discolored, with dark settling at the bottom and faded herbs suspended in oil. The lid is rusted and stained, suggesting the sauce has been sitting out far too long.

783. Homemade Chimichurri Left at Room Temperature for Months

June 11, 2025 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from eating homemade chimichurri left at room temperature for months.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • FPT Nummer et al
  • Kimchi - Wikipedia
  • Chimichanga - Wikipedia
  • Modelling the pH of mayonnaise by the ratio of egg to vinegar - ScienceDirect
June 11, 2025 /Don Schaffner
Chimichurri, Botulism, Garlic in oil

Actual image from Facebook.

777. Eating Deviled Eggs Made From Home-Canned, Split Open Hard-Boiled Eggs

May 28, 2025 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from eating deviled eggs made from home-canned, split open hard-boiled eggs,

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • Canning Rebels | Hard boiled egg experiment | Facebook
  • Text of "GREEN EGGS AND HAM" (by Doctor Seuss)
  • Green Eggs and Ham - Google Books
  • Food Safety Talk 319: I'm Feeling Botchy Today — Food Safety Talk
  • Pickled Eggs - National Center for Home Food Preservation
  • Why do Eggs Turn Green When Cooked? | Incredible Egg
  • Full article: Investigation of a type C/D botulism outbreak in free-range laying hens in France
  • Challenge studies with Listeria monocytogenes and proteolytic Clostridium botulinum in hard-boiled eggs packaged under modified atmospheres - ScienceDirect
  • Pressure Canning Whole Eggs for the pantry! *NOT a G0v+ approved method #storingeggs #preservingeggs - YouTube
  • Foodborne Botulism From Eating Home-Pickled Eggs --- Illinois, 1997
  • Freezing Eggs - National Center for Home Food Preservation
May 28, 2025 /Don Schaffner
Eggs, Home canning, Botulism

DALL·E image text: A square photo of a glass jar, half-filled with syrupy peaches. Several peach slices are covered in thick, fuzzy mold, appearing green and white. The jar has a weathered metal lid, and the syrup inside is cloudy. The scene is softly lit against a plain, neutral background.

765. Big Open Spoiled Jar of Canned Peaches at Room Temperature

April 30, 2025 by Don Schaffner

Dr. Don and Professor Ben revisit episode 759, and talk about the risks of eating from big open spoiled jar of canned peaches at room temperature.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • 759. Big Open Jar of Canned Peaches at Room Temperature — Risky or Not?
  • Further Studies on Development of Clostridium Botulinum in Refrigerated Foods 1 - Tanner - 1940 - Journal of Food Science - Wiley Online Library
  • Further Studies on Development of Clostridium botulinum in Refrigerated Foods - abstract
  • Growth and Toxin Production by Clostridium botulinum in Sauteed Onions - ScienceDirect
  • Journal of Food Science - Wikipedia
April 30, 2025 /Don Schaffner
Botulism, Peaches, Spoilage, Fungus, pH

DALL·E - A big block of cheddar cheese without any holes, sitting in a tightly sealed vacuum packager. The cheese looks slightly warm and sweaty...

644. Vacuum Packed Cheddar at Room Temperature for 24 hours

July 22, 2024 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from vacuum packaged cheddar cheese stored for 24 hours at room temperature.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Merch — Risky or Not?
  • Urban Dictionary: I Do Declare
  • CDPH Testing Confirms Botulism Linked to Nacho Cheese Sauce
  • Consensus categorization of cheese based on water activity and pH—A rational approach to systemizing cheese diversity - ScienceDirect
  • Evaluation of Factors Involved in Antibotulinal Properties of Pasteurized Process Cheese Spreads - ScienceDirect
  • Inhibition of Clostridium botulinum in Model Reduced-Sodium Pasteurized Prepared Cheese Products - ScienceDirect
  • Growth of Proteolytic Clostridium botulinum in Process Cheese Products: II. Predictive Modeling - ScienceDirect
  • Growth of Listeria monocytogenes, Salmonella spp., Escherichia coli O157:H7, and Staphylococcus aureus on Cheese during Extended Storage at 25°C
  • Nacho cheese botulism kills 1 person and puts 9 in the hospital | CNN
  • Designating certain cheeses non-time/temperature control for safety foods | Council III | 2014 Scribe Packet | Conference for Food Protection
  • Foodborne botulism: A brief review of cases transmitted by cheese products (Review) - PubMed
July 22, 2024 /Don Schaffner
Cheese, Vacuum packaging, Botulism

Nate’s actual pan

639. Nate's Meat Diet Cast Iron Pan Grease

July 10, 2024 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of reusing grease after cooking in a cast iron pan.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Merch — Risky or Not?
  • Foodborne Botulism -- Illinois
  • Heat Inactivation Rates of Botulinum Toxins a, B, E and F in Some Foods and Buffers - Woodburn - 1979 - Journal of Food Science - Wiley Online Library
  • The Wire: to evacuate - YouTube
July 10, 2024 /Don Schaffner
Grease, Cast iron, Botulism

DALL·E - A dusty jar of pickled quail eggs sits on a shelf in a dimly lit country store. The jar is old and unlabeled. Behind it, slightly out of focus, is another jar with a skull and crossbones.

610. Unrefrigerated Unlabeled Pickled Quail Eggs From a Country Store

May 03, 2024 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from eating unrefrigerated unlabeled pickled quail eggs from a country store.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • Amazon.com : Buc-ee's Pickled Quail Eggs 16oz : Grocery & Gourmet Food
  • Buc-ee's in St. Augustine: Quail eggs, kolaches and other unusual eats
  • Physical and Microbiological Characteristics of Pickled Eggs from Physical and Microbiological Characteristics of Pickled Eggs from Japanese Quail (Coturnix coturnix japonica) of the Pharaoh Japanese Quail (Coturnix coturnix japonica) of the Pharaoh Variety
  • Pickled Eggs - National Center for Home Food Preservation
  • Foodborne Botulism From Eating Home-Pickled Eggs --- Illinois, 1997
  • Southern Coast Enterprises - 547377 - 05/25/2018 | FDA
May 03, 2024 /Don Schaffner
Eggs, Pickled foods, Botulism

DALL·E Image of boiled Yukon gold potatoes in a clear glass bowl, teeming with colorful, cartoon-style bacteria.

590. Kejni's Extra-Crispy Roast Potato Recipe

March 18, 2024 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of leaving boiled chunks of Yukon gold potatoes at room temperature overnight.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • J. Kenji López-Alt
  • James Neal (ice hockey) - Wikipedia
  • Last night I followed the beginning of my extra-crispy roast potato recipe (I boiled chunks of Yukon golds in water with salt and a pinch… | Instagram
  • Large Outbreak of Botulism: The Hazardous Baked Potato | The Journal of Infectious Diseases | Oxford Academic
  • Restaurant-Associated Type a Botulism: Transmission by Potato Salad | American Journal of Epidemiology | Oxford Academic
  • Combined effect of water activity and pH on inhibition of toxin production by Clostridium botulinum in cooked, vacuum-packed potatoes | Applied and Environmental Microbiology
  • Presence and Significance of Bacillus cereus in Dehydrated Potato Products - ScienceDirect
  • Influence of temperature shifts on survival, growth, and toxin production by psychrotrophic and mesophilic strains of Bacillus cereus in potatoes and chicken gravy - ScienceDirect
  • Presence and Growth of Bacillus cereus in Dehydrated Potato Flakes and Hot-Held, Ready-to-Eat Potato Products Purchased in New Zealand - ScienceDirect
  • 154. Michael Scott Bacon Method — Risky or Not?
March 18, 2024 /Don Schaffner
Potatoes, Botulism, Bacillus cereus

Here's the image of a swollen can of Surströmming, showcasing the high pressure inside due to the fermentation process. The can is set on a rustic wooden table, featuring a label with classic Swedish design elements.

588. Swollen Can of Surströmming

March 13, 2024 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of eating surströmming from a swollen can.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Surströmming - Wikipedia
  • Fermented and ripened fish products in the northern European countries - ScienceDirect
  • Discovering microbiota and volatile compounds of surströmming, the traditional Swedish sour herring - ScienceDirect
  • Safety of Fermented Fish Products - ScienceDirect
  • Fermented and ripened fish products in the northern European countries - ScienceDirect
  • Strictly anaerobic halophiles isolated from canned Swedish fermented herrings (Surströmming) - ScienceDirect
  • Swollen can of surströmming - SURSTRÖMMING - THE OFFICIAL STORE
March 13, 2024 /Don Schaffner
Fish, Botulism, Surströmming

DALL·E - a slightly dented can of tunafish

552. Tuna From a Can Freshly Dented at Home

December 20, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of eating tuna from a can just dented at home.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • The Ultimate Podcasting Hack: Record in your closet and use two pillows | by Saron Yitbarek | Medium
  • Double seaming process guide - Industrial Physics
  • Is it safe to use food from dented cans?
  • Better Process Control School - Consumer Brands Association
  • food safety - What do to with cans that you just dented? - Seasoned Advice
December 20, 2023 /Don Schaffner
Canned food, Botulism

DALL·E - a toddler stepping on a trash can pedal to open the trash can and sticking their head in the trash.

544. Toddler Getting Into Kitchen Trash

December 01, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks a toddler getting into kitchen trash.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Norovirus Outbreak Related to Contaminated Surfaces | The Journal of Infectious Diseases | Oxford Academic
  • Full article: Occurrence of bacteria and biochemical markers on public surfaces
December 01, 2023 /Don Schaffner
Trash can, Botulism, Listeria

527. Hawaiian Chili Pepper Water

October 23, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from Hawaiian chili pepper water.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Who Needs Hot Sauce When You Have Hawaiian Chile Pepper Water?
  • Hawaiian Chili Pepper Water Recipe - Chili Pepper Madness
  • Authentic Hawaiian Chili Pepper Water Recipe — Snack Hawaii
  • Accompaniments: Chutneys, Relishes, Pickles, Sambals, and Preserves - Kusuma Cooray - Google Books
October 23, 2023 /Don Schaffner
Chili pepper, Botulism

DALL·E - Open half empty can of chicken noodle soup sitting on a countertop. Note that DALL·E totally invented the spoon, which was not part of the prompt.

498. Room Temperature Canned Chicken Noodle Soup

August 16, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of consuming canned chicken noodle soup without heating.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Bon Vivant Voluntarily Recalls All Vichyssoise From Dealers - The New York Times
  • Acidified and Low-Acid Food Regulatory Requirements
  • Better Process Control School - Consumer Brands Association
  • Botulism Associated with Commercially Canned Chili Sauce --- Texas and Indiana, July 2007
  • Marie Antoinette - Wikipedia
August 16, 2023 /Don Schaffner
Low acid canned foods, Botulism, Soup

DALL·E - a little Baked Potato sitting in a white slow cooker on a countertop in a kitchen

492. Slow Cooker Baked Potatoes With No Water

August 02, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from making a baked potato in a slow cooker without added water.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Carnac the Magnificent - Wikipedia
  • Food Talk, UGA SNAP-Ed on Twitter: "Easily make slow-cooker baked potatoes, no water needed. 1. clean potato, 2. Season with olive oil, salt, and pepper, 3. Place potatoes on LOW for 6-8 hours or on HIGH for 4 hours. Add chives and greek yogurt (a low-fat, high-protein substitute for sour cream). https://t.co/fVBGUFf4dM" / X
  • Slow cookers and food safety | UMN Extension
  • Counting-out game - Wikipedia
August 02, 2023 /Don Schaffner
Potatoes, Slow cooker, Botulism

DALL·E - a worried pig standing next to a grill with three potatoes wrapped in aluminum foil

491. Foil Wrapped Smoked Potatoes

July 31, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks from cooking potatoes cooked in a smoker.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Tastee Sub Shop · Apple Maps
  • Tastee Freez - The Original Soft Serve Ice Cream
  • What was the Double E Warren Zevon referred to?
  • Large Outbreak of Botulism: The Hazardous Baked Potato | The Journal of Infectious Diseases | Oxford Academic
  • Restaurant-Associated Type a Botulism: Transmission by Potato Salad | American Journal of Epidemiology | Oxford Academic
  • Conservative prediction of time to Clostridium botulinum toxin formation for use with time-temperature indicators to ensure the safety of foods - PubMed
  • Sleater-Kinney
  • Parameters Determining Inoculated Pack Challenge Study
July 31, 2023 /Don Schaffner
Potatoes, Botulism, Smoker

469. Marinated Feta in a Jar

June 09, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks consuming marinated feta (with garlic) in oil in a jar bought at a farmers market.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • Certified Food Scientist | CIFST
  • Overview of Food Ingredients, Additives & Colors | FDA
  • FRESHFARM on Instagram: “It's time to praise the CHEESE 🧀 January 20 is NATIONAL CHEESE LOVERS DAY! Did you know that you could stock up on cheese at your…”
  • Amazon.com: Customer Questions & Answers
  • Amazon.com: Danish Feta In Oil and Spices (Apetina) 9.7 oz (275g) : Grocery & Gourmet Food
  • Danish Feta with Olives In Oil and Spices (Apetina) 3.1 lb – Parthenon Foods
  • Arla Apetina Feta Cheese in Oil with Herbs & Spices, 9.7 oz - Kroger
June 09, 2023 /Don Schaffner
Feta, Garlic in oil, Botulism

468. One Sip of Opened 16 Hour Unrefrigerated Fruit and Veggie Blend

June 07, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks to a child from taking one sip from an open and unrefrigerated container of fruit and veggie blend after 16 hours.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Job-Aid, Time and Temperature Control for Safety Foods
  • OhMyMega Veggie! | Once Upon a Farm
June 07, 2023 /Don Schaffner
Acid food, Acidified food, Botulism

DALL·E a little bit of melted butter in a pan with a few small bits of sautéed vegetables in the style of edward hopper

425. Reusing Room Temperature Butter for Sautéing Vegetables

February 27, 2023 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of reusing room temperature butter for sautéing vegetables.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Risky or Not?
  • Heat Inactivation Rates of Botulinum Toxins A, B, E and F in Some Foods and Buffers - Woodburn- 1979 - Journal of Food Science - Wiley Online Library
  • Conditions associated with Clostridium sporogenes growth as a surrogate for Clostridium botulinum in nonthermally processed canned butter - PubMed
  • Botulism outbreak in a rural Ethiopia: a case series | BMC Infectious Diseases | Full Text
  • Outbreaks of Botulism at Albany, Oregon, and Sterling, Colorado, February, 1924 on JSTOR
February 27, 2023 /Don Schaffner
Butter, Botulism, Time temperature control for safety

DALL·E 2022-12-02 10.25.23 - vacuum packed container of olives sitting in the back of an open dimly lit refrigerator in the style of Edward Hopper

392. Polly's Old Olives

December 12, 2022 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of some vacuum sealed olives found by Polly in a bar fridge.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • Conservative prediction of time to Clostridium botulinum toxin formation for use with time-temperature indicators to ensure the safety of foods - PubMed
  • Amazon.com : Marinated Mixed Olives With Orange and Herbs | Kalamata Greece | Terra Creta | 250g : Grocery & Gourmet Food
  • Archaeopteryx - Wikipedia


December 12, 2022 /Don Schaffner
Olives, Botulism, Expired food

355. Corn Water

September 16, 2022 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of keeping a half a corn cob in a sealed bottle of water, and sipping after a few days.

Dr. Don - risky ☣️
Professor Ben - risky ☣️

  • Don Schaffner 🦠 on Twitter: "@clairedwillett Please google “pruno botulism” 😬" / Twitter
  • Pruno: A Recipe for Botulism | Botulism | CDC
  • Recipe: Fermented Corn — FarmSteady
  • Southern Sour Corn Recipe - How to Make Lacto Fermented Corn
September 16, 2022 /Don Schaffner
Botulism, Corn

330. TK's Flat Seltzer

July 20, 2022 by Don Schaffner

Dr. Don and Professor Ben talk about the risks of drinking a can of seltzer that tasted flat and was slightly crushed after being in ice for an hour.

Dr. Don - not risky 👍🏼
Professor Ben - not risky 👍🏼

  • TK on Twitter: "@bugcounter @benjaminchapman this can was normal shapes before being submerged in ice for an hour. Can crushed in, no leaks. Upon opening, can completely flat tasting as if somehow the CO2 escaped. Any risk of botulism in carbonated water? I can’t imagine, but the wife asked. https://t.co/yjLegc7fXw" / Twitter
  • FAQ: Water expansion on freezing
  • Sporicidal Properties of Chlorine Compounds: Applicability to Cooling Water for Canned Foods1,2 | Journal of Food Protection
  • Retort Cooling Water Bacteriological Load and Possible Mitigation Strategies for Microbial Buildup in Cooling Water
  • Kirkland Signature Sparkling Water, Variety Pack, 12 fl oz, 35 ct | Costco
  • The history of sparkling water - Borg & Overström
  • Carbonated Canning Line - YouTube
July 20, 2022 /Don Schaffner
Botulism, Seltzer, Leaky
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