The summer of 2026 has brought a familiar but no less urgent challenge to public health officials across the United States: a diverse array of foodborne illness outbreaks, each with its own pathogen, its own implicated food, and its own set of victims.
As of early July, the Centers for Disease Control and Prevention (CDC) is actively coordinating between 17 and 36 investigations of multistate foodborne illnesses each week, involving pathogens such as Salmonella, Listeria, and E. coli. While not all of these investigations result in public outbreak notices, a significant number have advanced to the point where consumers are being warned and products are being recalled. This article provides a detailed summary of the most significant active and recently concluded outbreak investigations across the United States, drawing on data from the CDC, the Food and Drug Administration (FDA), and the Food Safety and Inspection Service (FSIS).
Listeria monocytogenes: Soft Cheese and Deli Meat
One of the most severe active outbreaks is a multistate Listeria monocytogenes outbreak linked to soft requesón cheese produced by Clover Hill Dairy in Mechanicsville, Maryland. As of June 24, 2026, a total of 12 people infected with the outbreak strain have been reported from four states. Illnesses have been ongoing for an unusually long period, with sample collection dates ranging from March 6, 2023, to June 2, 2026. Ten have been hospitalized, and one death has been reported in Maryland.
The investigation has identified the source of the contamination: six product samples of requesón cheese and two environmental samples collected by the Maryland Department of Health tested positive for Listeria monocytogenes and matched the outbreak strain. In response, Clover Hill Dairy expanded its recall on June 18, 2026, to include all cheese products manufactured at their facility, including varieties of requesón, cuajada, and hard cheeses. These products were distributed through the dairy’s retail market, farmers markets, and third-party distributors in Maryland, New Jersey, New York, North Carolina, Virginia, and Washington, D.C.. Further complicating the recall, the products may be relabeled under different brand names, including KESSO, QUESOS LA RICURA, IZALCO, DE MI PUEBLO, and RIO LINDO. Additional recalls were issued by La Ceiba Foods Latin Market Inc. and Nelson & Isa Lacteos, LLC, which distributed the contaminated cheese to retail locations in New York.
Beyond the cheese outbreak, FSIS issued a public health alert on May 9, 2026, for headcheese deli meat products that may be contaminated with Listeria monocytogenes. The product, DAISY BRAND Meat Products HEADCHEESE, with a “USE BY” date of “MAR 26 2026,” was produced on January 20, 2026, and intended for slicing at retail delis. FSIS collected an unopened headcheese product sample that tested positive for Listeria, and further testing is ongoing to determine if the product samples are related to the specific outbreak strain. The agency recommends that retail delis clean and sanitize all surfaces and discard any open meats and cheeses that housed the products. This alert is part of an ongoing illness outbreak investigation, though the number of cases has not been publicly specified.
Salmonella: Moringa Leaf Powder and Other Outbreaks
Salmonella remains the most prevalent pathogen in active CDC investigations, with 14 active multistate outbreaks as of June 30, 2026. Two active investigations have been linked to moringa leaf powder in dietary supplements. The first, announced in January, involved Salmonella contamination detected in multiple product and ingredient samples, including Live it Up Super Greens supplement powders and Why Not Natural moringa powder capsules.
A more recent Salmonella outbreak, with illness onset dates ranging from February 3, 2026, to April 7, 2026, has sickened 18 people across 14 states. The source of this outbreak has not yet been identified. Additionally, an April 2026 investigation update noted a significant surge in Salmonella illnesses, with 329 new illnesses reported since the previous update, including new outbreak strains of Salmonella Enteritidis, Mbandaka, Indiana, and Infantis. The FDA’s CORE Response Teams are managing multiple Salmonella investigations, including one linked to a not-yet-identified product where the case count has increased to 70, and another Salmonella Newport outbreak (ref #1366) where the case count has risen to 69.
E. coli O157:H7: Frozen Blueberries and Raw Dairy
E. coli O157:H7 has been the focus of several outbreak investigations in 2026. The most notable active investigation involves frozen blueberries. On July 7, 2026, the CDC and FDA announced that an E. coli outbreak had been linked to Publix store brand frozen blueberries. The outbreak has hit Florida and Georgia, with 12 people infected, 11 in Florida and one in Georgia, and four hospitalized. The frozen blueberries were distributed to six other states as well. In response, Frutas y Hortalizas del Sur S.A. of Chile initiated a recall of frozen GreenWise Organic IQF Blueberries due to potential E. coli O145 contamination. The investigation is ongoing, and traceback efforts are underway.
A separate E. coli O157:H7 outbreak linked to raw cheddar cheese and raw milk sold by Raw Farm, LLC, was declared over on April 30, 2026. This outbreak involved nine people from three states, with illnesses starting on dates ranging from September 1, 2025, to February 20, 2026. Of the nine people with available information, three were hospitalized, including one with hemolytic uremic syndrome (HUS), a serious condition that can cause kidney failure. Over half of the illnesses were in children under five years old. The investigation found that all eight people interviewed reported consuming unpasteurized milk or cheese, and seven of them specifically reported Raw Farm brand dairy products. While FDA inspection found E. coli in a cheddar cheese sample from Raw Farm, the strain was a different one than that from the sick people in this outbreak.
Cyclospora and Other Pathogens
The FDA’s CORE Outbreak Table has also been tracking a new Cyclospora outbreak. Cyclospora is a parasite that causes prolonged diarrheal illness, and it is often associated with contaminated fresh produce. As of June 18, 2026, the FDA had initiated traceback for this outbreak. The investigation is in its early stages, with a limited number of cases reported so far.
In addition to these bacterial and parasitic outbreaks, the FDA is investigating an adverse event linked to Clostridium botulinum (infant botulism) in Nara Organics Whole Milk Powdered Infant Formula. The FDA has initiated sampling as part of this investigation. This is a separate and distinct investigation from the foodborne illness outbreaks, focusing on a specific product and its potential link to a serious illness in infants.
Analysis and Next Steps
What is new in the current outbreak landscape is the convergence of several trends. First, there is the persistence of Listeria in soft cheese production environments, despite years of regulatory attention. The Clover Hill Dairy outbreak, which has spanned over three years from the first known illness to the most recent, demonstrates that Listeria can establish itself in a facility and cause sporadic illnesses over an extended period before being detected. The expanded recall to include all cheese products from the facility highlights the challenge of tracing contamination back to a specific source when it has become endemic. Second, the E. coli outbreak linked to frozen blueberries represents a shift from the more common fresh produce vehicles to frozen products, which consumers often perceive as safer. Third, the sheer volume of active Salmonella investigations, 14 as of late June, underscores the ongoing struggle to control this ubiquitous pathogen. The FDA’s CORE table also shows that several investigations are ongoing even when the outbreak has been declared over, indicating that traceback and root-cause analysis continue long after the immediate public health threat has passed.
Why this matters is because the human toll of these outbreaks is substantial. In the Listeria outbreak, ten hospitalizations and one death have been reported. In the E. coli outbreak, three hospitalizations and one case of HUS. In the Salmonella outbreak, 26 hospitalizations. These are not merely statistics; they represent individuals who have suffered severe illness, and families who have been affected. The economic burden is also significant, encompassing medical costs, lost productivity, and the cost of recalls and investigations. Furthermore, these outbreaks erode public trust in the food supply and highlight vulnerabilities in the system.
Who is affected is a broad cross-section of the population, but certain groups are disproportionately impacted. In the E. coli outbreak linked to raw dairy, over half of the illnesses were in children under five. In the Listeria outbreak, the age range of those sickened was 16 to 81, with a median age of 55, indicating that older adults are particularly vulnerable. Pregnant women, the elderly, and immunocompromised individuals are at heightened risk for severe outcomes from Listeria and other pathogens. Consumers who purchase soft cheeses, frozen fruits, or dietary supplements are directly affected by these outbreaks.
What to do now requires a multi-faceted response. For consumers, the most important action is to stay informed. The CDC and FDA websites provide up-to-date information on active outbreaks and recalls. Consumers should check their homes for recalled products, such as Clover Hill Dairy cheeses, Publix frozen blueberries, and moringa leaf powder supplements, and discard them immediately. Pregnant women, older adults, and immunocompromised individuals should avoid high-risk foods like soft cheeses, unpasteurized dairy, and ready-to-eat deli meats unless heated until steaming hot. Healthcare providers should be vigilant for symptoms of foodborne illness and should consider testing for pathogens like Listeria and E. coli in patients with compatible presentations. For the food industry, these outbreaks underscore the need for rigorous environmental monitoring, particularly in facilities that produce ready-to-eat foods. Whole genome sequencing (WGS) has proven to be an indispensable tool for linking illnesses to specific sources, and its continued use is essential for rapid detection and response. For regulators, the findings support continued investment in traceback technology, enhanced surveillance at ports of entry for imported produce, and the development of commodity-specific guidance for high-risk products. The challenge of foodborne illness is not static; it requires a sustained, adaptive response that matches the evolution of both pathogens and the products they contaminate.
