In May 2026, 86 people were diagnosed with food poisoning after eating bánh mì from a well-known vendor in Đắk Lắk.
But this is far from an isolated incident involving a random street stall. In 2023, Bánh Mì Phượng (in Hội An), one of Vietnam’s most famous bánh mì brands, was fined 96 million VND and suspended for three months over food safety violations after more than 300 customers fell ill.
In just the past six months, Vietnam has recorded at least 8 food poisoning outbreaks linked to bánh mì, affecting around 1,000 customers. More strikingly, many of these incidents involved long-established, locally renowned vendors rather than unknown roadside stalls.
So is bánh mì itself the problem—or is something else making Vietnam’s most iconic street food increasingly risky?
Why does bánh mì lead to food poisoning?
According to Phạm Khánh Phong Lan, Director of the Ho Chi Minh City Food Safety Department, bánh mì is inherently more vulnerable to contamination because of how it is prepared.
Unlike dishes such as phở, which are served hot, bánh mì combines a mix of fresh and pre-processed ingredients—pâté, pork floss, cold cuts, pickled vegetables, and raw herbs—and is typically assembled and eaten without any final heat treatment. This means there is no step to eliminate harmful bacteria before consumption.
Among these ingredients, pâté is particularly high-risk. With its high protein and fat content and minimal preservatives, it is highly susceptible to bacterial contamination, including Salmonella, and can spoil quickly if not stored under strict temperature control.
Many recent bánh mì-related food poisoning cases in Vietnam have been traced back to contaminated pate. Health officials say the issue often starts when pate is left at room temperature for long periods or displayed in hot outdoor conditions, creating an ideal environment for Salmonella to grow.
But pate is not the only risk. Cold cuts, pork rolls, fresh herbs, chili sauce, and other condiments can also become sources of contamination. Pre-cooked meats, if stored too long or kept in inadequate refrigeration, allow bacteria to develop. Meanwhile, fresh vegetables and herbs left out in Vietnam’s heat or humidity can quickly harbor pathogens such as E. coli and Listeria, both linked to severe food poisoning.
Unsafe handling practices further increase the risk. Vendors often handle ingredients with bare hands, then immediately touch cash and return change, creating a direct pathway for cross-contamination and the spread of harmful bacteria.
Pham Khanh Phong Lan noted that recent hot and humid weather has created ideal conditions for bacteria to multiply. Adding to the risk, many customers buy bánh mì but do not eat it right away, leaving it at room temperature overnight before reheating it the next day. By then, fresh fillings may already have spoiled, increasing the risk of digestive illness or even severe food poisoning.
She also stressed the need to distinguish between patients hospitalized for confirmed food poisoning and those seeking check-ups for mild symptoms or out of precaution. “Some people may have eaten bánh mì two or even three days earlier, then hear vague reports about a food poisoning incident and rush to get checked, just to be safe. That can inflate the numbers,” she told VnExpress.
How to eat bánh mì safely?
Recent cases suggest that bánh mì itself is not the problem. Instead, unsafe preparation and improper storage are what often turn this iconic street food into a health risk.
According to Nguyen Duy Thinh, a former expert at the Institute of Biotechnology and Food Technology at Hanoi University of Science and Technology, many food poisoning cases linked to bánh mì do not stem from poor-quality ingredients, but from improper storage that allows otherwise safe food to become contaminated.
When buying your next bánh mì, it helps to pay attention to how ingredients are stored. Fresh fillings should be kept under proper refrigeration and ideally prepared and sold within the same day to limit bacterial growth.
It’s also worth checking whether the vendor has a valid food safety certification, which indicates compliance with standard handling and storage practices, as well as approved ingredient sourcing.
Equally important is how the sandwich is assembled. Clean utensils, separate cutting boards for raw and fresh ingredients, and the use of gloves or proper food-handling equipment can significantly reduce the risk of cross-contamination.
After purchase, avoid leaving bánh mì at room temperature for too long. If not eaten immediately, it should be refrigerated and consumed within 24 hours to maintain freshness and minimise potential health risks.
When prepared and handled properly, bánh mì remains what it has always been: one of Vietnam’s most iconic—and safe—street foods.
