Among the more than 2,600 serotypes of Salmonella enterica, a handful account for the great majority of human illness. Salmonella Javiana is one of them, consistently ranked fourth or fifth nationally in the United States, responsible for roughly 5–6% of laboratory-confirmed salmonellosis, and disproportionately concentrated in the Southeast and along the Gulf and Atlantic coastal plains.

What makes Javiana scientifically interesting is not simply its frequency. It is one of a small minority of non-typhoidal Salmonella (NTS) serotypes that carries the genetic island encoding the typhoid toxin, also called Salmonella cytolethal distending toxin (S-CDT), a genotoxin best known from Salmonella Typhi, the agent of typhoid fever. Javiana is also unusual epidemiologically and is largely not a meat-and-poultry organism. Its outbreak record points overwhelmingly at fresh produce, and its underlying reservoir appears to be environmental, amphibians, reptiles, surface water, and warm southern soils.

As of early August 2026, Javiana is at the center of a large, unresolved multistate outbreak in the United States, which makes an accounting of what is and is not known about this serotype more than academic.

Taxonomy and Microbiology

Javiana belongs to Salmonella enterica subspecies enterica, the subspecies responsible for nearly all human disease. Its antigenic formula under the White–Kauffmann–Le Minor scheme is 1,9,12:l,z28:1,5, placing it in the O:9 (serogroup D1) somatic group, the same O group as Typhi and Enteritidis. This shared serogroup occasionally causes confusion in laboratories that group-type without proceeding to full serotyping.

Epidemiology in the United States

Salmonella overall causes an estimated 1.35 million illnesses, 26,500 hospitalizations, and roughly 420 deaths annually in the U.S. Javiana’s share of that burden has grown markedly. It ranked fifth among reported serotypes between 1996 and 2007, rose to fourth in 2008 at about 5% of cases, and accounted for approximately 6% of Salmonella outbreaks in 2016. Compared with 1996, reported Javiana cases increased by nearly 360% by 2015, reaching roughly 2,700 laboratory-confirmed cases nationally, a genuine emergence rather than a surveillance artifact, though improved subtyping certainly contributed.

Geography

Javiana’s distribution is among the most geographically skewed of any common serotype. It is concentrated in the southeastern United States, particularly south Georgia, central Arkansas, Mississippi, and the coastal plains of the Carolinas. In 2016, the states with the highest incidence per 100,000 population were Mississippi (6.65), South Dakota (6.29), South Carolina (5.17), and North Carolina and Georgia (3.50 each). In some southern tertiary-care settings, Javiana has been the single most common Salmonella serotype isolated.

The South Dakota figure is a reminder that the picture is not static. Javiana’s range appears to have expanded across Florida, along the Gulf Coast, and up the Atlantic seaboard over recent decades, and clusters have increasingly originated in northern states. Whether this reflects range expansion of an animal reservoir, warming climate, or simply the national distribution of southern-grown produce remains unsettled.

Seasonality and Demographics

Javiana infections peak sharply in summer, more so than most serotypes. Proposed explanations include higher populations or activity of an animal reservoir, greater human exposure to recreational water and the outdoors, and higher pathogen loads in environmental sources under warm conditions.

Children are disproportionately affected. Multiple analyses find the highest attack rates in children under 10, with one large FoodNet-based analysis reporting that 37.6% of Javiana cases occurred in children aged 0–4. Case-control work in Georgia and Tennessee found cases more likely to be male and under 13 than controls.

Clinical Outcomes at the Population Level

Analysis of 2,390 Javiana cases in FoodNet states from 1996–2006 found that 20.6% were hospitalized, 2.8% represented invasive disease (isolation from blood, CSF, bone or joint fluid, or another sterile site), and 0.4% died. Notably, Javiana’s hospitalization rate (21%) was significantly lower than Typhimurium’s (24%) in the same dataset, and Javiana was not among the serotypes with elevated invasiveness. Serotypes such as Dublin (64% invasive) and Choleraesuis (57%) occupy a completely different tier.

This creates a genuine tension worth stating plainly: Javiana carries a genotoxin that promotes systemic spread in animal models, yet epidemiologically it behaves as a garden-variety gastroenteritis serotype, if anything slightly milder than Typhimurium.

Reservoirs and Ecology

The dominant hypothesis for Javiana’s southern concentration is an amphibian and reptile reservoir. Frogs, toads, turtles, snakes, and lizards are well-documented Salmonella carriers, and their abundance and diversity peak in the warm, wet southeastern coastal plain. A 2001 investigation in Mississippi explicitly linked Javiana infections to amphibian contact. A case-control study in the Southeast found elevated odds of Javiana infection associated with untreated well water and with reptile or amphibian contact.

Surveys in Georgia produce-growing regions have recovered Salmonella from both toads and turtles in pre-irrigation ponds, with genotypes shared between animals and water, a plausible mechanism connecting wildlife to irrigation systems and, ultimately, to crops.

Water and Soil

Surface water, farm ponds, irrigation reservoirs, and shallow wells in the Southeast harbor diverse Salmonella populations, with certain serovars persisting in specific watersheds over years. Javiana appears well adapted to this niche. In controlled experiments with tomato plants grown in sandy loam soil, Javiana and Newport colonized soil more efficiently than Montevideo, Saintpaul, or Typhimurium, and Javiana ranked among the serovars best adapted to survival in association with tomato plants.

This matters because it changes the intervention logic. If Javiana’s reservoir is a regional environment rather than a food-animal production chain, then interventions aimed at slaughterhouses and processing plants, the traditional levers of Salmonella control, will not touch it.

Not a Livestock Organism

The negative evidence is strong. Between 1998 and 2005, USDA-FSIS isolated Javiana from fewer than 0.5% of broiler chicken and ground beef samples, with none found in ground beef after 2003. Across roughly 500,000 HACCP samples from 1998 to 2009, only about 30 were Javiana-positive, with no meaningful correlation between FSIS-regulated products and human Javiana illness. Approximately 70% of Javiana outbreaks have been linked to plant-derived foods.

Transmission and Outbreak History

Most Javiana infections are sporadic rather than outbreak-associated, which is itself informative, it suggests diffuse environmental exposure rather than a single contaminated production stream. But the outbreak record, spanning eight decades, is remarkably consistent in pointing at things people eat raw.

A timeline summarizing the major documented Javiana outbreaks, from the earliest reported case series through the ongoing 2026 investigation, appears at the end of this report.

Across CDC outbreak surveillance for 1998–2008, Javiana accounted for 11% of tomato-associated Salmonella outbreaks and 20% of leafy-vegetable outbreaks. It remains among the top five serotypes associated with fresh-cut produce, averaging about 11 PulseNet clusters per year between 2008 and 2012.

The 1990 tomato outbreak is a mechanistic classic: field-grown tomatoes from a single South Carolina packer were dumped into a shared water bath. When warm fruit is immersed in cooler water, the pressure differential can draw contaminated water through the stem scar into the fruit’s interior, where surface sanitizers cannot reach. The same repacking facility was implicated in a 1993 Montevideo outbreak, the facility, not the farm, was the problem.

The 2002 Transplant Games outbreak deserves mention for a different reason: among those exposed to contaminated pre-diced tomatoes were dozens of organ transplant recipients on immunosuppressive therapy, precisely the population for whom NTS gastroenteritis can become bacteremia.

The 2026 Outbreak

On July 23, 2026, the FDA added a new Salmonella Javiana outbreak (CORE reference #1395) to its outbreak investigation table, listing 106 laboratory-confirmed cases and an unidentified product, with traceback underway. One week later the count had doubled to 212. The agency withheld patient ages and states of residence, not unusual early in a CORE investigation, but leaving consumers with little actionable information.

The picture sharpened at the state level. The Minnesota Department of Health identified 110 Javiana cases in that state alone. Of 84 patients interviewed, 75 (89%) reported eating at a Chipotle restaurant between June 14 and July 14; those who had not reported eating at other Mexican-style quick-service restaurants. Minnesota investigators identified jalapeños as the suspected vehicle. Cases have also been reported in Colorado.

On August 4, 2026, Chipotle removed the implicated jalapeños, traced to a common supply lot, from restaurants nationwide and replaced them with product from different growers. The company’s ingredient traceability system reportedly identified the lot within hours of notification. Minnesota’s foodborne disease unit stated it had no ongoing concerns about Chipotle specifically, while cautioning that the outbreak may continue if the contaminated product is being served elsewhere: the implicated peppers were distributed to multiple food-service retailers across several states. As of this writing, no grower, packer, or distributor has been publicly named, and no federal recall has been issued.

Jalapeños are not a novel Salmonella vehicle; serrano and jalapeño peppers were the eventual vehicle in the large 2008 S. Saintpaul outbreak initially misattributed to tomatoes, but this appears to be the first major Javiana outbreak attributed to peppers.

Javiana’s Own Twist

Javiana is not, in practice, a notably invasive serotype. Its invasive-disease proportion (2.8%) and hospitalization rate (21%) sit at or below the middle of the pack. Several explanations are plausible and not mutually exclusive: the toxin may matter more for host colonization and shedding, and hence transmission, than for invasion; the human-adapted glycan-binding specificity that makes Typhi’s toxin so effective may be absent in Javiana; or the effect may be real but too small to detect against the background variance of surveillance data. Longer-term consequences of repeated genotoxin exposure in the gut, including any oncogenic risk, have not been studied epidemiologically at all.

Clinical Features, Diagnosis, and Treatment

Javiana causes typical NTS gastroenteritis. Incubation is roughly 6 hours to 6 days, followed by diarrhea (occasionally bloody), fever, abdominal cramps, nausea, and sometimes vomiting. Most people recover in 4–7 days without medical treatment. Severe dehydration, high fever, or persistent symptoms warrant clinical evaluation.

Risk factors for invasive disease are the standard ones: infancy, age over 65, immunosuppression (including transplant recipients and people with HIV), sickle cell disease, malignancy, corticosteroid use, achlorhydria or acid suppression, and prosthetic implants. Post-infectious sequelae, reactive arthritis and, less commonly, irritable bowel syndrome, occur as with other NTS serotypes.

Diagnosis

Diagnosis relies on stool culture; increasingly, culture-independent diagnostic tests (multiplex PCR panels) provide the initial result. This creates a surveillance problem: without an isolate there is no serotype and no genome, so reflex culture remains essential for public health. Blood cultures are indicated when bacteremia is suspected. In one Tennessee series of 111 clinical Javiana isolates, 84.7% came from stool, 6.3% from urine, and 5.4% from blood; the blood isolates came from older patients (mean age ~72) and the urine isolates predominantly from women (mean age ~55).

Treatment

Treatment of uncomplicated Javiana gastroenteritis is supportive, oral or intravenous rehydration. Antibiotics are not recommended for otherwise healthy patients, as they do not shorten illness and may prolong shedding. Antimicrobial therapy is reserved for severe disease, bacteremia, extraintestinal infection, and high-risk hosts, typically with a fluoroquinolone, ceftriaxone, or azithromycin, guided by susceptibility testing.

Antimicrobial Resistance

Javiana is, by contemporary standards, a relatively drug-susceptible serotype, a meaningful contrast with Typhimurium, Heidelberg, and Hadar, which show substantially higher resistance prevalence.

A study of 409 Javiana isolates from Arkansas (2003–2008) found that while 92% were resistant to at least one of 15 antimicrobials tested, 89% of these represented resistance to sulfisoxazole alone. Fewer than 2% showed resistance to more than a single agent; only about 3% were resistant to clinically important drugs including gentamicin, ciprofloxacin, or ceftiofur.

The practical implication is favorable: first-line agents remain effective for the minority of Javiana cases requiring treatment. Continued NARMS surveillance is nonetheless warranted, as the sulfisoxazole-resistant background indicates that resistance determinants circulate in this population.

Genomics and Surveillance

Javiana populations are genetically diverse rather than clonal. Pulsed-Field Gel Electrophoresis (PFGE) studies found dozens of distinct patterns across clinical, food, and environmental isolates, consistent with a heterogeneous environmental population rather than a single epidemic clone. This diversity historically limited PFGE’s discriminatory power for Javiana cluster detection.

Whole-genome sequencing (WGS) has substantially improved matters. A phylogenetic analysis of 111 Tennessee clinical isolates from 2017–2018 resolved distinct clades with differing gene content, identified mobile genetic elements and resistance determinants, and demonstrated that clinical presentation (blood versus urine versus stool isolation) showed some clade association. PulseNet’s transition to WGS has made it possible to link sporadic Javiana cases across states that PFGE would have left unresolved, which is part of why outbreaks like the 2026 cluster are detected at all.

Prevention and Control

Because Javiana’s reservoir is environmental and its vehicles are produce, control levers differ from those for poultry-associated serotypes:

Preharvest

Agricultural water quality is the central control point, testing and treatment of irrigation water, particularly surface water in the Southeast; buffer zones and drainage management around ponds; wildlife exclusion where feasible, recognizing that excluding amphibians from a subtropical farm pond is largely aspirational. FDA’s Produce Safety Rule addresses agricultural water, worker hygiene, soil amendments, and animal intrusion.

Postharvest

The tomato-packing lesson generalizes: wash water must be warmer than the produce, adequately sanitized, and monitored, to prevent infiltration through stem scars and cut surfaces. Repacking and fresh-cut facilities are demonstrated amplification points, converting a single contaminated lot into a multistate outbreak. Cold-chain integrity limits growth on cut produce.

Food Service

The 2026 outbreak illustrates how a single ingredient lot distributed to many operators produces geographically dispersed illness. Lot-level traceability, the capability that let one chain identify its implicated lot within hours, is the difference between a targeted withdrawal and a blind national advisory.

Consumer and Household

Wash produce under running water; refrigerate cut produce promptly; avoid cross-contamination. Wash hands thoroughly after handling amphibians or reptiles, their enclosures, or their water; the CDC advises against reptiles and amphibians in households with children under five or immunocompromised members. Households on private wells in the Southeast should test and, if indicated, treat their water.

Selected Javiana Outbreaks: A Chronology

1942	1989	1990	1991	1993	2002	2004	2018	2019–20	2026
New Mexico	Minnesota	IL, MI, MN, WI	Michigan	Germany	32 states (Transplant Games)	9 states + Ontario	41 states	14 states	Multistate
Cheese	Cheese, single plant (with S. Oranienburg)	Tomatoes, one SC packer	Watermelon	Paprika & paprika-spiced potato chips	Diced tomatoes	Roma tomatoes	Kratom (multi-serovar)	Pre-cut fruit mix (Tailor Cut Produce)	Jalapeños (suspected)
40 cases (case series)	Multistate case-control study	176 cases	57 cases	~1,000 est. cases	141 cases	429 cases (383 Javiana, 89.3%)	199 cases total; Javiana 1 of 6 serovars	165 cases, 73 hospitalized	212+ cases (ongoing)

Figure 1. Timeline of major documented Salmonella Javiana outbreaks, 1942