NEW ORLEANS, Aug. 8 (Nationwide Times) — People swimming in warm coastal water or eating raw shellfish face a risk from Vibrio vulnificus, a naturally occurring bacteria that can cause serious illness in some cases. Louisiana health officials reported nine infections and five deaths in the state in 2026.
The Louisiana Department of Health said all nine cases were linked to seawater entering wounds. The department also said every infected person had an underlying medical condition.
That information does not mean that every trip to the beach poses a serious danger. But it does explain why public-health agencies urge people with open wounds or certain health conditions to take extra care around warm saltwater and brackish water.
How infection happens
Vibrio vulnificus lives naturally in warm saltwater and brackish water, which is a mix of saltwater and freshwater. The bacteria are found in higher numbers from May through October, according to the Centers for Disease Control and Prevention, the Louisiana Department of Health and the Florida Department of Health.
A wound infection can occur when an open cut, scrape, recent piercing or surgical wound comes into contact with contaminated coastal water, health agencies say. Infection can also happen after someone eats raw or undercooked shellfish, especially oysters.
Louisiana’s 2026 cases were linked to wound exposure, according to the state health department. The supplied state information does not say whether any of those cases involved shellfish.
Why the illness can become severe
The CDC says about one in five people with a Vibrio vulnificus infection die, sometimes within a day or two of becoming ill. That is an overall estimate among people who are infected; it is not the chance that every person exposed to seawater will become infected or die.
Severe illness can include a bloodstream infection, septic shock, blistering skin lesions and necrotizing fasciitis. Necrotizing fasciitis is a rapidly spreading infection that damages tissue. The CDC, Louisiana health officials and Florida health officials say some severe cases require intensive care, surgery to remove damaged tissue or limb amputation.
The Florida Department of Health says healthy people typically develop mild disease. It identifies people with weakened immune systems, especially those with chronic liver disease, as being at greater risk of serious illness.
What health agencies recommend
The CDC and state health departments advise people with open wounds to stay out of saltwater and brackish water. They also advise covering wounds with a waterproof bandage if contact cannot be avoided and washing wounds with soap and clean water after exposure.
Florida health officials advise people at higher risk to avoid raw or undercooked shellfish. The CDC says shellfish should be cooked thoroughly, and people should wash their hands after handling raw seafood.
Health agencies say a wound that becomes red, painful, swollen or blistered after contact with coastal water should receive prompt medical attention. The CDC also advises seeking care for symptoms of illness after eating raw or undercooked shellfish, particularly for people at higher risk.
What the state numbers show
Florida Department of Health data listed 12 Vibrio vulnificus cases and one death in Florida as of July 30, 2026. The death was in Palm Beach County. The same department lists 33 cases and five deaths statewide in 2025, and 82 cases and 19 deaths in 2024.
The available state reports do not provide a complete national count for 2026. They also do not establish that the Louisiana deaths represent a nationwide increase.
For most people, the practical steps are limited but important, health agencies say: keep open wounds away from warm coastal water, handle shellfish safely and seek medical care quickly if a wound changes after exposure.
