Federal food safety officials have documented 52 outbreaks of foodborne illness linked to sprouts in the United States between 1996 and 2020, together causing more than 2,700 reported illnesses. That count appears in the Food and Drug Administration's own guidance to the sprout seed industry. This week, it received a new entry: a Minneapolis grower recalled alfalfa sprouts sold under the Calco and Everything Sprouts brands after 55 people across 15 states fell ill.
The recurrence is the story. Sprouts represent a tiny share of the American produce supply and an outsized share of its outbreak record. Federal regulators have known why since the late 1990s, have written rules specifically for sprout growers, and are still investigating the same product with the same two pathogens three decades later.
For a household standing in the produce aisle, that history changes the calculation. This is not a one-time contamination event at one facility. It is a pattern with a documented biological cause, and the federal advice for high-risk groups has not changed since 1999.
Biology That Makes Sprouts Different
The problem starts with the seed and ends with the growing conditions.
Sprout seeds are typically grown outdoors like any other agricultural commodity, where they can pick up bacteria from soil, water, or animals. Those bacteria survive on the dry seed. Sprouting then requires exactly the conditions bacteria need to multiply: warmth, moisture, and available nutrients, sustained for several days.
The result is that a few bacterial cells on a seed can become an enormous population by the time of harvest. Because sprouts are usually eaten raw or barely cooked, there is no kill step between the growing room and the plate. Washing does not resolve it. The contamination is not sitting on the surface waiting to be rinsed away.
FDA has been explicit that seeds are the most likely source of contamination in many of these outbreaks, and that the temperature, water activity, pH, and nutrient conditions of sprout production are also ideal for pathogen growth. Alfalfa has been the sprout type most often implicated, and Salmonella and E. coli the pathogens most often involved. The current investigation involves both organisms at once, an unusual combination.
Rules That Exist and What They Require
Contrary to a common assumption, sprout growers are not unregulated. Subpart M of the Produce Safety Rule, issued under the Food Safety Modernization Act, sets requirements that apply specifically to sprout operations and to no other produce commodity.
Covered sprout operations must take measures to prevent contamination of seeds and must treat seeds before sprouting, or rely on documented prior treatment by the seed supplier. They must test spent sprout irrigation water, or the in-process sprouts themselves, from every production batch for pathogens including E. coli O157:H7 and Salmonella. Product cannot enter commerce until those results come back negative. Operations must also test the growing environment for Listeria and take corrective action when any sample tests positive.
On paper, that is a stringent regime, stricter than what applies to lettuce or berries. The accountability question is why outbreaks continue anyway.
Several answers appear in the federal record. Seed treatment reduces contamination but does not reliably eliminate it, a limitation FDA has acknowledged since its earliest sprout guidance. Batch testing samples a fraction of a lot and can miss uneven contamination. Questions about coverage, inspection frequency, and enforcement cannot be answered by the outbreak record alone.
FDA's final guidance for the sprout seed industry recommends steps to prevent adulteration throughout the seed production chain. Guidance documents describe the agency's current thinking and are not themselves binding requirements.
Inside the Current Investigation
The active outbreak illustrates the pattern rather than departing from it.
According to the Centers for Disease Control and Prevention, 55 people have been confirmed ill across 15 states, with four hospitalizations and no deaths, based on data current through August 24. Two people have been infected with both pathogens, an unusual finding the agency flagged directly.
Everything Sprouts, LLC of Minneapolis recalled certain lots of alfalfa sprouts sold under the Everything Sprouts and Calco brands at retailers and grocery stores. CDC advises anyone holding recalled product to throw it out or return it, and to wash items and surfaces the sprouts may have touched.
The investigation remains open. CDC has not identified where contamination occurred, and case counts in outbreaks of this type typically lag, because both organisms take weeks to move from a sick person into a state surveillance database.
Guidance That Has Not Changed in 25 Years
The consumer advice attached to this outbreak is nearly identical to advice federal officials issued in 1999, and its stability is the point.
Cooking sprouts thoroughly reduces risk substantially. Federal guidance has long advised that people at higher risk of serious foodborne illness avoid raw sprouts entirely. That group includes adults 65 and older, children under 5, pregnant people, and anyone with a weakened immune system, including transplant recipients and people on immunosuppressive medication.
Anyone with recalled product should discard it or return it rather than wash it, and should clean and sanitize surfaces and containers the sprouts touched. Sandwiches, salads, and deli items assembled at home during the distribution window are worth considering, since sprouts are often an added ingredient rather than a standalone purchase.
Symptoms warranting a call to a clinician include diarrhea with a fever above 102 degrees Fahrenheit, bloody diarrhea, diarrhea lasting more than two days without improvement, vomiting severe enough to prevent keeping liquids down, and signs of dehydration such as reduced urination, dry mouth and dizziness on standing. In young children, a rare complication called hemolytic uremic syndrome can follow E. coli infection and cause kidney failure, which makes decreased urination after a diarrheal illness an urgent finding.
CDC and FDA are expected to post updated case counts and any traceback findings as the investigation proceeds, and the recall could expand if additional lots are implicated. Whether this outbreak prompts any change to federal sprout requirements, rather than another round of guidance, is the longer question.
Key Questions Answered
How many sprout outbreaks has the government documented? FDA guidance to the sprout seed industry reports 52 outbreaks of foodborne illness linked to contaminated sprouts in the United States between 1996 and 2020, resulting in more than 2,700 reported cases.
Why do sprouts cause so many outbreaks? Seeds can carry bacteria from the field, and sprouting requires warmth, moisture, and nutrients over several days — the same conditions bacteria need to multiply. Sprouts are usually eaten raw, so there is no cooking step to kill pathogens.
Are sprout growers regulated? Yes. Subpart M of the FDA Produce Safety Rule applies specifically to sprout operations, requiring seed treatment, pathogen testing of spent irrigation water or in-process sprouts from every batch before product ships, and environmental testing for Listeria.
Why do outbreaks continue if those rules exist? Seed treatment reduces but does not reliably eliminate contamination, and batch testing samples only a portion of a lot. Questions about which operations are covered, how often they are inspected, and how the rule is enforced are not answered by the outbreak record alone.
Does washing sprouts make them safe? No. Contamination can be internal to the sprout rather than sitting on the surface, so rinsing does not reliably remove it. Cooking sprouts thoroughly substantially reduces risk.
Who should avoid raw sprouts entirely? Federal guidance advises that adults 65 and older, children under 5, pregnant people, and anyone with a weakened immune system avoid raw sprouts. That advice predates the current outbreak and applies year-round.
What should someone do if they ate the recalled product? Discard any remaining product rather than washing it, and sanitize surfaces it touched. Contact a clinician for diarrhea with a fever above 102 degrees, bloody diarrhea, diarrhea lasting more than two days, vomiting that prevents keeping liquids down, or signs of dehydration.
