Protecting families from contaminated food and water
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Protecting families from contaminated food and water
Posted in Our Blog,Outbreaks & Recalls,Salmonella on March 4, 2026
Who would have thought a contaminated beer cooler would be the source of a Salmonella outbreak affecting prospective Brown County jurors. A combination of human action and artificial intelligence made the connection. Which has increased awareness and generated new procedures for cooler sanitation and safe beverage handling processes.
This glimpse into the marrying of people and technology comes from a recent Centers for Disease Control and Prevention (CDC) Morbidity and Mortality Weekly Report (MMWR).
The way the saga unfolded reads like a tv drama. However, the events were quite real. Especially to the 13 people who were involved.
How did it all go down?
Let’s explore how a contaminated beer cooler impacted several lives, a Brown County trial, and prompted new regulations.
On August 5, 2024, the Brown County sheriff notified the local health department that during the juror screening, several candidates reported experiencing gastrointestinal illness. However, no investigation took place at that time.
It wasn’t until a week had passed that the Illinois Department of Public Health reached out to the county health department with a confirmed case of Salmonella Agbeni that the pieces began coming together.
The confirmed diagnosis, combined with multiple reports of gastrointestinal illness at the courthouse, prompted the County to open an outbreak investigation.
The National Electronic Disease Surveillance System flagged seven laboratory-confirmed cases with the same genetic fingerprint among residence of five Illinois counties.
Six other “probable” cases were close contact with those who had laboratory confirmed infections were also identified through patient interviews. Those six individuals did not seek medical care. They indicated milder symptoms (nausea and diarrhea), and therefore were never tested for Salmonella.
Having similar symptoms and the same exposure as confirmed cases labels their illness as “probable” when it comes to the outbreak investigation. However, that six and the confirmed seven brings the minimum impact of the outbreak to a total of 13.
Patient interviews revealed a common exposure. All outbreak patients attended the Brown County Fair in Illinois between July 30 and August 4, 2024.
The Brown County Fair is an annual event in Mount Sterling Illinois. An estimated 36,000 people (around 5,000 per day) flock to the event each year. Between grandstand, food vendors, and tailgating, there are many different potential food exposures.
Bathroom facilities included portable restrooms, and according to the MMWR, “a limited number of portable handwashing stations.”
In addition to the location, a potential food (beverage) source was uncovered. All patients reported drinking beer served from a cooler in the fair’s beer tent. This tent was staffed by a rotating group of volunteers and fair board members who handled the beverages and ice.
No other common food or environmental exposures were identified.
The problem was, by the time this tidbit of information was uncovered, the fair was over. All potential samples were gone. There was no way to conduct any environmental samples.
This is where technology came into play.
Enter AI or artificial intelligence (with human interview input).
The Brown County Fair Salmonella Outbreak investigation had a few potential sources to work with. The first being inadequate hand hygiene and portable toilet use combined with food served at the event.
The overwhelming connection to a potentially contaminated beer cooler was also on the list of contenders.
The initial hypothesis when it comes to Salmonella was vendor-prepared meals. Nine sick people indicated they had purchased and eaten food for one or more of the vendors. However, four did not eat at the fair at all.
Handwashing also came up in outbreak patient interviews.
Two patients said they used their own personal hand sanitizer. Ten people said they did not wash their hands.
Portable toilets were also a concern.
However, four outbreak patients did not use the portable toilets at the event.
With the major connection to the beer tent, a contaminated beer cooler was also on the list of suspects. Brown County Health Department investigators interviewed those working at the beer tent during the fair to understand how the cooler and the beer cans were handled.
Reports indicated that a large, “improvised cooler” was employed. This cooler was a non-food-grade corrugated black plastic farm drainage tile consisting of four internal compartments. Only ice and beer were meant to be placed in this “cooler.”
Ice was provided to the beer tent and available to all fair vendors by a single company. The company used the municipal water supply to produce the ice.
Prior to being used as a makeshift cooler, the container was hosed out with a water hose. no soap was used to clean it. Additionally, the cooler was not rinsed again throughout the event. Staff members handled the ice and cans with their bare hands. Handwashing stations were not available inside the beer tent.
Another detail not made available to event coordinators until after the fair was over involved standing water in the cooler. A spigot was employed to allow water to drain as ice melted and was replenished. However, staff members indicated that they did notice standing water. Which was no longer available to test, as the fair had concluded.
With several competing theories and no environmental samples, an actual source could not be proven. However, in the age of technology we have options. Sophisticated number crunching AI.
Health officials asked ChatGPT 4.0.
Data was fed into the large language model. Things like which days each fair attendee became sick, the vendors they purchased food from, what each person ate or drank, and whether the patients spent time in the infield or grandstand area.
Then, they asked ChatGPT some questions.
MMWR said the AI model responded that Salmonella Agbeni could, in fact, grow in a cooler under certain conditions. One of which was standing meltwater combined with hot summer days and lack of sanitation.
According to ChatGPT, Salmonella-contaminated meltwater contacts the exterior of beverage cans. Subsequent hand-to-mouth transfer constitutes a “plausible route of exposure.”
The AI model compared alternative hypotheses and indicated that, given the environmental conditions, along with no common food, ice contamination was the most consistent explanation. Which is where investigators believed the source to be.
Only 13 people of presumably hundreds who got beer from the beer tent became sick. The AI response explained that several factors go into how people may have avoided illness. Including exposure dose, how individuals handled cans, and fluctuations in water temperature throughout the day.
Several studies were provided where contaminated ice or beverages stored in ice were linked to outbreaks of gastrointestinal illness.
While no definitive number was provided, AI emphasized that such outbreaks are well documented in literature. Making the potentially contaminated beer cooler a credible and likely source of the outbreak.
In response to this Salmonella Outbreak, Brown County Health Department developed specific guidance on cooler sanitation and safe beverage handling practices. According to MMWR, “educational materials were distributed to all participating vendors, event organizers, and community partners.” This literature was also forwarded to fair board members food handlers, and volunteers.
The new requirement involves routine sanitation of ice coolers using a bleach solution, making equipment used for beverage service subject to inspection, and indicated restriction will be implemented if sanitation standards are not met.
Cooler sanitation protocols are now a required component of future vendor licensing agreements.
If you’d like to know more about food safety topics in the news, like “How Investigators Discovered a Contaminated Beer Cooler Was to Blame for a Salmonella Outbreak in a Group of Jurors Using AI,” check out the Make Food Safe Blog. We regularly update trending topics, foodborne infections in the news, recalls, and more! Stay tuned for quality information to help keep your family safe, while The Lange Law Firm, PLLC strives to Make Food Safe!
By: Heather Van Tassell (contributing writer, non-lawyer)