Researchers at Washington University School of Medicine in St. Louis have made a groundbreaking discovery that could revolutionize the prevention of diarrheal diseases caused by enterotoxigenic Escherichia coli (ETEC) and Shigella. These two bacterial pathogens are responsible for hundreds of millions of infections annually and are leading causes of diarrheal mortality worldwide, particularly among young children. Despite decades of efforts, vaccine development has encountered significant obstacles, primarily due to the extensive strain variability that hampers the identification of universal vaccine targets.

In a recent study published in the Proceedings of the National Academy of Sciences, the WashU team, collaborating with scientists at the University of Missouri and the International Centre for Diarrhoeal Disease Research in Bangladesh, identified a shared vulnerability within these pathogens that could open the door for a combined vaccine platform. This innovative approach hinges on targeting homologous enzymes that these bacteria use to degrade the mucus lining in the human gut, a critical step in establishing infection.

For bacterial pathogens like ETEC and Shigella to cause illness, they first need to overcome the intestinal mucus barrier. This thick layer of mucus serves as a physical and biochemical shield protecting the gut epithelium and regulating the microenvironment by keeping pathogenic entities at bay while preserving the beneficial microbiota. The ability to breach this barrier is a hallmark of pathogenicity, allowing bacteria to access the underlying tissues and deploy additional virulence factors, including enterotoxins that induce diarrhea.

The study’s focal point is a family of mucin-degrading enzymes that facilitate this breaching process. The researchers detail three closely related enzymes—EatA, SepA, and Pic—that are expressed by ETEC, Shigella, and other diarrheal pathogens. EatA, an acronym for “eat away,” is produced by ETEC and was previously identified by Fleckenstein’s laboratory as a critical mucinase targeting the primary structural protein within mucus. SepA and Pic, related enzymes produced by Shigella and some other bacteria, perform analogous roles. Their enzymatic activity effectively dismantles the mucosal barrier, clearing a path for bacterial invasion.

Intriguingly, the antibodies that the team isolated from individuals infected with ETEC or experimentally exposed to the bacteria displayed a functional cross-reactivity. The antibodies not only neutralized EatA but also inhibited SepA and Pic, indicating a conserved epitope region among these mucinases. This neutralization prevents the enzymes from degrading intestinal mucus, thereby blocking the pathogens’ entry into host tissues. The concept of a single antibody interfering with multiple bacterial targets underscores a significant breakthrough in vaccine strategy.

To unravel the structural mechanics behind this immune neutralization, the researchers leveraged cryo-electron microscopy—a state-of-the-art imaging method that preserves biomolecules in near-native states by flash-freezing samples. This technique enabled detailed visualization at atomic resolution, revealing the precise binding site of the neutralizing antibodies. Remarkably, the site of interaction was a structurally conserved region across EatA, SepA, and Pic, providing a rational basis for the design of vaccine antigens that elicit broadly neutralizing antibodies.

“The identification of this shared Achilles’ heel among diverse diarrhea-causing bacteria signifies a paradigm shift in vaccine development,” explains James M. Fleckenstein, MD, co-senior author of the study and professor of medicine at WashU. “It suggests we can target a common mechanism of gut colonization rather than chasing highly variable surface molecules, which has been the stumbling block in the field for so long.”

Further bolstering the translational potential of these findings, epidemiological data from children in Dhaka, Bangladesh, indicate that naturally acquired antibodies against EatA correlate with protection from diarrheal illness. This natural immunity validates EatA as a viable immunological target and encourages the pursuit of vaccines that induce similar protective responses.

The implications extend beyond the developing world, as enterotoxigenic E. coli has been implicated in recent foodborne outbreaks in industrialized countries such as the United States. The difficulty in distinguishing pathogenic ETEC from non-pathogenic strains in clinical settings further complicates diagnosis and containment. Moreover, reliance on antibiotics to treat infections caused by these bacteria accelerates the evolution of antibiotic resistance, posing a global public health threat.

Zachary Berndsen, PhD, assistant professor of biochemistry at the University of Missouri and co-senior author, emphasizes the rational approach to vaccine design enabled by these insights. “By pinpointing enzyme domains targeted by neutralizing antibodies, we provide a template for crafting precise immunogens that can stimulate protective immunity across multiple pathogens. This can streamline the production of vaccines that are both effective and broad-spectrum,” Berndsen says.

Development of such a vaccine could not only reduce the global burden of diarrheal diseases but also mitigate the spread of antibiotic resistance by decreasing the frequency of bacterial infections requiring treatment. Additionally, preserving the gut microbiota through targeted disruption of pathogenic mechanisms may alleviate some adverse consequences associated with broad-spectrum antibiotic use.

Going forward, the research team is focused on translating their molecular discoveries into practical vaccine candidates. This involves preclinical testing of immunogens incorporating the conserved epitopes identified, assessing their immunogenicity and protective efficacy in animal models, and progressing toward human clinical trials.

“In our ongoing battle with enteric pathogens that have coevolved with humans for millennia, blocking the enzymatic opening of the mucus gate represents a promising strategy,” Fleckenstein concludes. “If successful, this vaccine would preempt infection at its earliest and most vulnerable stage, changing the trajectory of diarrheal disease worldwide.”

The study was supported by grants from the National Institute of Allergy and Infectious Diseases and the Department of Veterans Affairs. The multidisciplinary collaboration brings together expertise in infectious diseases, structural biology, immunology, and clinical research, underscoring the necessity of integrated approaches to tackle complex global health challenges.

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Subject of Research: Human tissue samples

Article Title: Human enterotoxigenic Escherichia coli (ETEC) infections elicit antibodies that broadly neutralize mucinases of pathogenic Escherichia coli and Shigella

News Publication Date: 15-Jun-2026

References:
Buckley DP, Akhtar M, Thapa M, Schmitz A, Turner J, Vickers TJ, Khatoon N, Kaisar MH, Coggin JA, Ganguli D, Sheikh A, Laird RM, Poly F, Porter CK, Ruiz-Perez F, Miller MJ, Chowdhury F, Bhuiyan TR, Qadri F, Trillo-Muyo S, Dolan B, van der Post S, Ellebedy A, Berndsen ZT, Fleckenstein JM. Human enterotoxigenic Escherichia coli (ETEC) infections elicit antibodies that broadly neutralize mucinases of pathogenic Escherichia coli and Shigella. PNAS. June 15, 2026.

Image Credits: David Hasty

Keywords: Infectious diseases, Microbial infections, Diarrhea

The oldest known cases, discovered among hunter-gatherers in Siberian graves, contradict the theory that the disease once was mild.

New analysis of ancient frozen Greenland rubbish heaps, called middens, has revealed new insights into several ancient societies that have passed through the country over the last five millennia. The findings include insights into ancient diseases and animals that the inhabitants kept but didn’t eat.

Although the team noted the potential risk that climate change could release dangerous ancient microbes into the modern environment, their analysis found little evidence that the pathogens they identified could pose a threat beyond the immediate area around the middens.

Ancient Middens Offer Historical Insights Beyond Traditional Artifacts

Archaeologists have often excavated items discarded by ancient societies from trash heaps to learn more about the people who lived there. Although such excavations often unearth things like animal bones and mollusk shells, offering insights into diet and hunting habits, these ancient rubbish heaps can also contain human artifacts, such as discarded blades and other tools.

In a country like Greenland, where different peoples have settled the region since 2,500 BCE, the ancient middens may also contain microbes that could offer researchers an entirely different type of historical data. For example, microbial data from middens could reveal which diseases ancient populations had to survive. The team notes that microbes could also help determine what ancient societies kept “but perhaps didn’t eat.”

Still, studies of ancient midden microbes are limited, leaving a gap in historical knowledge. The authors of the new paper also highlight that rapidly increasing Arctic warming could release infectious diseases to which humans have lost immunity over the ensuing generations.

Over One Thousand New Species Were Identified

To bridge the information gap, Dr Frank Møller Aarestrup, a professor at the National Food Institute of Denmark Technical University and corresponding author of the article detailing the team’s research, examined samples collected during 2020 and 2021 expeditions in West and South Greenland. During those expeditions, scientists collected samples from middens locked in time by permafrost, dating back as far as 4,500 years.

Among the middens sampled were the ancient Norse sites of Kapisilit and Narsarsuaq, where researchers collected soil samples from what the new paper’s authors termed “historic winter enclosures.” The site also contained evidence that it was a summer grazing ground for livestock.

After selecting several soil samples, Dr. Aarestrup’s team sequenced the DNA of ancient microbes found in the midden samples. Next, they compared the data, including entire bacterial communities, to 143 soil samples previously collected from areas of permafrost far away from any known historical human settlements.

According to the team’s statement, the sequencing revealed a total of 1,207 species and differing ranges of bacterial species per midden. In denser areas, the team identified as many as 202 species, whereas less microbe-dense middens had as few as nine.

The team’s analysis also found several species that had not been previously identified. This resulted in the team labeling the unidentified microbes using what they termed “broad taxonomic categories” above the genus and species level, such as family and order.

Preserving the ‘Biological Legacy’ of Human Activity

When comparing the microbial communities in the ancient middens with those from samples collected away from human settlements, the team found a significantly richer community of ancient bacteria preserved in the middens. The team notes that this discrepancy confirms that the middens “preserved the biological legacy of human activity.”

The most soil-like bacterial communities were identified within the oldest Paleo-Inuit middens. The researchers said the finding suggests that the microbial “imprint” left behind by humans and animals diminishes over time.

Bacterial communities were also associated with the types of waste discarded in each ancient midden. For example, although most middens contained bacteria associated with human and animal hosts, middens from colonial-era Nuuk contained decomposing seal skins. The middens from colonial-era sites were also rich in the bacterium Clostridium perfringens, which the team notes is “a major cause of food poisoning.”

Risk of Ancient Pathogens is Low

Although the team identified strains of bacteria that can cause botulism or other life-threatening conditions, such as toxic shock syndrome, sepsis, and gangrene, they also found a diversity of antimicrobial-resistance genes in the genomes of bacteria collected from the same middens.

According to the study authors, finding the two sets of genes in ancient and modern soil layers “signaled that microbes resistant to antimicrobials can linger in permafrost for centuries.”

Fortunately, the team’s analysis found that most of the identified microbes, including potentially dangerous pathogens, don’t spread far from middens, even those undergoing defrosting. As a result, the team said that these ancient microbes  “pose little risk to public health,” at least for the time being.

“Here we show that the risk of release of ancient pathogens from ancient middens in Greenland is currently low,” Dr. Aarestrup explained.

Instead, the researcher noted that Arctic middens appear to function like “long-term natural experiments,” in which both human- and animal-associated bacteria, including “opportunistic” species carrying resistance genes, remain detectable centuries later as a broader “legacy of human activity.”

The study “Microbial composition of archaeological middens: Tracing Human Footprints Through Centuries in Greenland’s Ancient Settlements” was published in Frontiers in Microbiology.

Christopher Plain is a Science Fiction and Fantasy novelist and Head Science Writer at The Debrief. Follow and connect with him on X, learn about his books at plainfiction.com, or email him directly at christopher@thedebrief.org.