Louisiana has recorded seven Vibrio vulnificus deaths so far this year, the highest annual death tally from the so-called flesh-eating bacteria in at least a decade. As of November 10, the state had logged 21 reported cases in 2026, and every single one of those patients was hospitalized and had an underlying health condition.
The figures come from state health data cited by NOLA.com, which reported that Vibrio vulnificus deaths in Louisiana have typically numbered just one to three per year since 2016, according to Louisiana Department of Health data. Louisiana recorded six deaths in 2023 and just one in 2024, making this year's total of seven a sharp jump even against a backdrop that has already looked unusual. The state also reported 30 Vibrio cases and five deaths in 2025, following a run of elevated activity that researchers and health officials have been tracking for more than a year.
Amy Whitehead, a Louisiana Department of Health spokesperson, said vibrio cases and deaths vary from year to year, but acknowledged that 2025 and 2026 to date are among the years with the highest reported case counts. The department said it will monitor case counts to assess whether a sustained upward trend is emerging. Whitehead's agency did not provide exposure source information for the 2026 cases, leaving open how most of this year's patients came into contact with the bacteria.
A Decade of Grim Totals
From 2016 through 2025, Vibrio deaths in Louisiana totaled 28, according to state data. Of those, 16 were associated with seawater exposure, seven with foodborne exposure, and five had an unknown exposure source. That decade-long pattern underscores how unusual this year's single-year death count of seven is by comparison.
Vibrio vulnificus is often called flesh-eating bacteria because it can cause severe, life-threatening infections, according to the Louisiana Department of Health. It is considered the most severe of at least a dozen Vibrio species capable of causing illness, and it can trigger skin and bloodstream infections or gastrointestinal illness. The bacteria is found in warm, brackish coastal waters and can cause illness when an open wound is exposed to those waters. About one in five people infected die, according to the Louisiana Department of Health, and severe cases can lead to death within 48 hours of symptom onset — sometimes within a day or two of first becoming sick.
Doctors Say Even Minor Wounds Are Enough
Julio Figueroa, an infectious disease expert at LSU Health New Orleans, said even very minor wounds can enable infection. He described treating one Vibrio case that started with nothing more than a minor toe injury. In a separate case in Mississippi, doctors believe a patient contracted the bacteria after being bitten by a horsefly.
Figueroa said Vibrio cases tend to appear in summer, and that the Gulf has been very hot this year, conditions in which the bacteria blooms. Vibrio infections generally peak from May through October, and higher summer temperatures combined with storm runoff create more favorable conditions for the bacteria to flourish. Gulf Coast Vibrio cases have increased in recent years, a pattern consistent with research into warming coastal waters.
What the Water Data Shows
Tulane University microbiologist Tiong Aw, who led a research team that collected water samples in Lake Pontchartrain in 2023 and 2024, studied the relationship between water temperatures and Vibrio presence. A peer-reviewed study from that research, published in the journal of the American Society for Microbiology, found that from January through September 2025 Louisiana reported 26 cases of Vibrio vulnificus and five deaths, with 85% of those patients reporting wound or seawater exposure, according to journals.asm.org. The same study, which collected 101 water samples from nine sites over twelve months, found average Vibrio concentrations were far higher in summer — 5.2 × 10⁴ CFU/L in June, July and August — than in winter, when concentrations averaged 3.2 × 10³ CFU/L. Water temperature and salinity were significant predictors of those concentrations, and the gene linked to Vibrio vulnificus was detected in 84.2% of samples collected throughout the year.
Aw said Vibrio infection is very serious, especially for people with underlying conditions, but he said recent death statistics alone are not sufficient to establish a firm link explaining the rise in Louisiana deaths. His research team lacked funding to collect samples in more recent years and hopes to find funding to continue sampling next summer, leaving a gap in the most current water data even as case counts climb.
Who Is Most at Risk
People at highest risk of severe Vibrio outcomes include those with liver disease, and earlier reporting from NOLA.com identified diabetes and weakened immune systems as additional risk factors warranting extra caution. People with weakened immune systems, pregnancy, or liver or stomach disorders should also use caution when consuming raw or undercooked seafood, per Louisiana Department of Health guidance. Vibrio vulnificus infection can be treated with antibiotics, which are most effective when used early.
The Louisiana Department of Health advises avoiding brackish or salt water with an open wound, or covering any wound with a waterproof bandage before water exposure. The department also recommends washing exposed wounds thoroughly with soap and water. Earlier in 2025, the department reported that three-quarters of recent infections involved wounds or other direct water exposure, a figure cited in the same NOLA.com report that first tracked the summer's rising toll, when the state had recorded 20 infections and four deaths at that point in the year. That report also noted that Vibrio activity was not confined to Louisiana — dozens of infections and nine deaths had been logged across Louisiana, Florida, Alabama, Mississippi and Texas, with Florida reporting 11 infections of its own in 2025, according to the Florida Department of Health as cited by shreveporttimes.com.
