To Safer Infant Formulas and doing away with Botulism, Cronobacter sakazakii, Salmonella and Bacillus cereus

NOTE: This post on Marler Blog was written by food safety attorney, Bill Marler, and is reposted here with the author’s permission.

A bit over a month ago, I was set to testify before the House and Senate Safe Food Caucus in D.C. Instead, the night before I had a heart attack. I am fine. I got great care at Howard University Hospital and have made a complete recovery – although changing a few habits going forward.

I had been asked to share some thoughts on the infant formula industry’s inability to make sure that such a critical food item is safe. As I sit here on this Sunday afternoon I am puzzled how we can spend countless billions on yet another unnecessary war and even more billions on AI and robots to make most of us irrelevant and we cannot make infant food safer? Here is some of what I wanted to discuss. I am sure there are other ideas – I would love to hear them.

Infant formula has until recently been considered low risk for C. botulinum (and, then there are other pathogens – Cronobacter sakazakiiSalmonella and recently, Bacillus cereus of concern).

The recent C. botulinum outbreak and the mixed picture you get from looking at the multitude of WGS sequences on NCBI indicates that infant formula might be riskier. We need a new risk assessment of C. botulinum (and other pathogens) in infant formula and its constituent ingredients and how to control the pathogens in powdered infant formula (PIF). For C. botulinum we need more information about:

How often is infant formula and its constituents contaminated with C. botulinum spores?

Do we detect the pathogen when we need to? We need to assess if the current methods are good enough (sensitive enough)?

How often is a product contaminated with more than one strain of C. botulinum (multiple WGS profiles)? How many isolates (colonies on a plate) from each sample should be sequenced to detect all contaminants?

Should we routinely culture infant formula from cases of infant botulism when the child has been fed such a product? (I highly suspect that infant formula is causing many more cases of infant botulism than we know of at the moment).  

How do we best control C. botulinum spores in infant formula. We need studies on methods to control C. botulinum more efficiently in infant formula.

Do we need new regulations and redefined best practices for the production of infant formula and detecting and culturing the organism from product, environment and patients? 

Perhaps as a start:

Fund a risk assessment on the prevalence of C. botulinum spores, Cronobacter sakazakiiSalmonella and Bacillus cereus and sulfite reducing clostridia (as indicators) in:

            a.         raw milk

            b.         pasteurized milk

            c.         dairy powders – including whole milk powder, whey powder, whey protein concentrates, whey protein hydrolysates, nonfat dry milk, skim milk powder 

A specific risk assessment on the prevalence of C. botulinum spores and sulfite reducing clostridia in Powdered infant formula

Risk assessment on the prevalence of C. botulinum spores in minimally processed (non-retort thermally processed) commercial baby foods fed to children <1 year of age

Risk assessment on the prevalence of C. botulinum spores in low moisture infant first foods (puffs, cereals (rice and oatmeal), peanut butter, etc.)

Processing strategies to minimize spores in PIF – investigate technologies to reduce spores in infant foods while maintaining nutritional standards

Impact of farming practices on the incidence of C. botulinum spores in milk 

            a.         Prevalence of C. botulinum spores in silage, bedding, etc., at the farm

            b.         Milk collection on organic vs. conventional dairy farms

Improved resources for the tracking and following up of Infant Botulism cases to determine the source of botulism outbreaks

Bottom line for control of spores in powdered infant formula (PIF): either they destroy all the spores or reformulate to lower the incidence of spores in PIF (at least down to where it was prior to the addition of whole milk powder into the formulations of PIF). Because PIF is fed to infants from Day 1 it should be commercially sterile. Leave it up to the companies to determine how to make PIF commercially sterile. At the very least I would suggest that until a study is conducted to show the prevalence of C. botulinum spores in whole milk powder and a risk assessment is conducted, any formulation that contains whole milk powder should not enter into commerce.


It is inarguable that breastfeeding is the “gold standard” of infant nutrition. Unfortunately, not every woman is capable of providing an adequate supply of breast milk to her newborn.

Infant formula was developed originally as a means of supplementing a woman’s breast milk. Over the decades, it has grown into a Frankenstein’s monster—an ultraprocessed convenience food manufactured on a massive scale and heavily marketed to the medical profession and to individual consumers.

While the ultimate decision of breast- versus bottle-feeding rests with the mother, the responsibility for ensuring that infant formula is both safe and nutritious must sit on the shoulders of the industry and the FDA (and its sister agencies around the world).

The industry and its regulators have abrogated their responsibility for far too long. Bill Marler’s suggestions are sensible and long overdue.

Infant botulism outbreak is over — CDC

An outbreak of infant botulism linked to ByHeart powdered infant formula has ended, according to the US Centers for Disease Control and Prevention.

The final tally of victims comprises 28 confirmed cases and 20 probable cases from 17 states. No new cases have been added since December of 2025, and three previously reported suspected cases from 3 different states have been excluded from the totals.

Illnesses in this outbreak first began on December 24, 2023 and continued through November 29, 2025. The 48 victims ranged in age from 16 to 264 days old. All were hospitalized and treated with BabyBIG®. There were no deaths.

Outbreak cases were reported in Arizona (5), California (12), Idaho (2), Illinois (2), Kentucky (1), Massachusetts (2), Michigan (1), Minnesota (3), North Carolina (2), New Jersey (1), Oregon (3), Pennsylvania (1), Rhode Island (1), Texas (8), Virginia (1), Washington (2), and Wisconsin (1).

Epidemiological and laboratory analysis established ByHeart Whole Nutrition infant formula as the source of the illnesses. The company recalled all of its infant formula products on November 11, 2025.

Although the outbreak is officially over, the FDA‘s investigation into the root cause of the contamination continues.

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In addition to the finding of Clostridium botulinum in opened and sealed cans of infant formula by the California Department of Pubic Health, the New York State Department of Health, and the company itself, the FDA recovered the pathogen from a sample of organic whole milk powder from Organic West Milk, which supplies the ingredient to ByHeart. The milk powder was processed for Organic West Milk by a Dairy Farmers of America (DFA) facility.

Spores of Clostridium botulinum are found in soil around the world, and the pathogen has been known to infect dairy herds. Although the FDA has not yet released any firm conclusions regarding the root cause of the contamination, if these heat-stable spores were in the raw organic milk delivered to DFA for processing, they would have been able to survive the heat of pasteurization and remain viable in the finished powdered milk.

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TAINTED formats 3
“Reads like a true crime novel” – Food Safety News

Interested in learning more about food safety and the history of foodborne disease outbreaks and investigations?

Click on the link to listen to a short excerpt, then follow the buy links to add a digital, print or audio copy to your personal library.

Chapter 6. Birth of a Pathogen

Infant botulism outbreak strain found in organic powdered milk ingredient

January 23, 2026

The US Food and Drug Administration (FDA) reported today that a sample of organic powdered whole milk used as an ingredient in ByHeart Whole Nutrition infant formula has tested positive for Clostridium botulinum.

The FDA report did not identify the source of the organic powdered whole milk ingredient.

The sample of powdered milk was collected by the FDA at a processor for a supplier to ByHeart, and was analyzed by the Wadsworth Center Laboratory of the New York State Department of Health. Whole genome sequencing (WGS) testing found that the strain recovered from the milk powder is a genetic match for the Clostridium botulinum strain isolated from an infant victims of the outbreak.

The strain found in the powdered milk also is a genetic match for the strain recovered from a closed container of ByHeart formula collected by the FDA during the course of its investigation.

According to an update released today by the CDC, the number of confirmed and suspect cases of infant botulism in this outbreak remains at 51 individuals in 19 states.

Information provided to eFoodAlert by a spokesperson for the California Department of Public Health (CDPH) confirms that the state’s Infant Botulism Prevention and Treatment Program, which is the sole supplier the BabyBIG antitoxin used in the US to treat infant botulism, has not received any reports of new cases linked to ByHeart since the CDC’s December 17, 2025, update.

The CDPH was the first agency to recognize that a multistate outbreak of infant botulism with a common product exposure was in progress, notifying the CDC on November 5, 2025. The CDC mobilized the multistate outbreak response two days later, on November 7th, according to the CDPH spokesperson.

On November 8th, in response to a recommendation from the FDA, ByHeart initiated a recall of two production batches of its Whole Nutrition infant formula. The company expanded its recall on November 11th to include all batches of ByHeart Whole Nutrition infant formula in cans and Anywhere Packs.

ByHeart’s manufacturing operation remains paused while the investigation continues. The company has been cooperating with the FDA investigation and also has engaged a third-party laboratory to conduct Clostridium botulinum testing of its multiple batches of finished products.

To date, testing conducted by ByHeart’s lab has confirmed the presence of Clostridium botulinum in six samples from two different batch codes, both of which were included in the company’s initial November 8, 2025, product recall. In addition, the CDPH recovered Clostridium botulinum from an opened container of one of those batch codes. A sealed container from a third batch code, collected by Arizona and analyzed under the FDA’s Laboratory Flexible Funding Model, also yielded Clostridium botulinum.


TAINTED formats 3
“Reads like a true crime novel” – Food Safety News

Interested in learning more about food safety and the history of foodborne disease outbreaks and investigations?

Click on the link to listen to a short excerpt, then follow the buy links to add a digital, print or audio copy to your personal library.

Chapter 6. Birth of a Pathogen