All nine confirmed patients were hospitalized after wounds were exposed to seawater, according to Louisiana health officials.
BATON ROUGE, La. — Five people in Louisiana have died from Vibrio vulnificus infections in 2026 as state health officials report an unusually severe summer season for the dangerous bacterium found naturally in warm coastal water.
Louisiana had recorded nine cases as of Aug. 5, and all nine patients were hospitalized, according to the Louisiana Department of Health. State officials said every patient had an underlying health condition and every case involved a wound exposed to seawater. The five deaths already exceed what Louisiana usually records by this point in the year. During the same period over the previous 10 years, the state averaged seven cases and one death.
Vibrio vulnificus is one of about a dozen types of Vibrio bacteria known to cause human illness. The bacteria occur naturally in coastal waters and are found in greater numbers from May through October, when water temperatures are warmer. They can live in salt water and brackish water, the mixture of fresh and salt water commonly found where rivers meet the sea. Infection can occur when the bacteria enter a cut or other break in the skin. People can also become infected after eating raw or undercooked shellfish, particularly oysters.
The Louisiana cases reported this year stand out because all were linked to seawater exposure through wounds rather than the consumption of contaminated seafood. A wound does not have to be a major injury to create a pathway for the bacteria. Public health officials include cuts and scrapes, recent surgical wounds, piercings and tattoos among breaks in the skin that can be exposed to coastal water. Louisiana officials have urged people with such wounds to avoid contact with salt or brackish water or keep the area covered with a waterproof bandage.
Although Vibrio infections are uncommon, Vibrio vulnificus can cause severe disease once it enters the body. The Centers for Disease Control and Prevention says roughly 150 to 200 Vibrio vulnificus infections are reported nationally each year and about one in five infected people die, sometimes within one or two days after becoming ill. A wound infection can cause fever, redness, pain, swelling, warmth and discoloration. Severe cases can progress to necrotizing fasciitis, an infection that destroys tissue around a wound, or to a bloodstream infection marked by dangerously low blood pressure and other complications.
The term “flesh-eating bacteria” is often used to describe Vibrio vulnificus because it can cause necrotizing fasciitis, but it does not mean the bacteria literally consume flesh. The CDC notes that other bacteria, particularly group A Streptococcus, are a more common cause of necrotizing fasciitis in the United States. Severe Vibrio wound infections can require intensive medical treatment, including antibiotics and surgery to remove infected or dead tissue. Some patients require amputation.
Serious complications are more likely among people with certain medical conditions. The CDC identifies liver disease, cancer, diabetes, HIV and other conditions or treatments that weaken the immune system as factors that can increase the risk of severe illness. All nine Louisiana patients reported so far in 2026 had underlying health conditions, according to state health officials. The department has not publicly identified the patients or released detailed information about their individual medical histories.
The Louisiana figures are part of a recurring warm-season public health concern along the Gulf Coast. Vibrio bacteria thrive under the region’s combination of warm temperatures and coastal salinity. Florida, another state that regularly tracks Vibrio vulnificus, had reported 14 cases and two deaths this year when Louisiana officials issued their warning. Health authorities have also observed that case totals can vary significantly from year to year, with coastal storms and flooding sometimes creating conditions that increase exposure.
Louisiana health officials have emphasized the importance of rapid treatment when a wound exposed to coastal water begins showing signs of infection. They have advised patients to tell medical providers about recent saltwater or brackish-water exposure because Vibrio wound infections can worsen quickly. The state also recommends washing cuts or scrapes with soap and clean running water after contact with coastal water or raw seafood.
The state’s latest public data remained at nine cases and five deaths as of Aug. 5. Health officials are continuing surveillance during the warmest part of the year, when Vibrio concentrations in coastal water are typically highest. No identities of the people who died have been released in the state’s public case summary.
Author note: Last updated August 17, 2026.