Florida has confirmed a fifth death this year from Vibrio vulnificus, a bacterium that lives naturally in warm coastal water and can cause severe wound and bloodstream infections. State health data released Sept. 24 list deaths in Bay, Broward, Marion, Palm Beach and Pinellas counties, with the newest victim in Pinellas County described as between 50 and 54 years old, and 23 confirmed cases statewide, the Sarasota Herald-Tribune reported.

Five deaths already equal Florida's full-year total for 2025, a year in which the state recorded 33 cases. The update matters because Vibrio season is not over. Infections are most common from May through October, when water temperatures are highest, so beachgoers, anglers, boaters, and anyone handling raw shellfish along the Gulf and Atlantic coasts remain exposed for several more weeks.

The picture is broader than Florida. Louisiana has reported 19 cases and seven deaths as of Sept. 23, and more than 60 cases have been reported across coastal U.S. states this year, according to the same report. Vibrio vulnificus is not spread from person to person, and most people who swim in coastal water never develop serious illness.

Cases in 14 Counties, Deaths on Both Coasts

Florida's first 2026 death, in Palm Beach County, appeared in the state's surveillance table in late July, when 11 cases had been confirmed, MedicalDaily reported. Additional deaths followed in Bay County in the Panhandle, Marion County in north-central Florida, and Broward County in South Florida before the Pinellas case in the Tampa Bay area. Cases this year have come from 14 counties, from Santa Rosa in the Panhandle to Miami-Dade.

The spread of cases across both coasts and inland counties reflects how the bacterium works. Vibrio vulnificus thrives in warm salt water and brackish water, where rivers and bays mix with the sea, so people can be exposed in estuaries, canals, and back bays as well as on open beaches. A county listing shows where a patient lived, not necessarily where the exposure occurred.

The state has not publicly released how each 2026 victim became infected, and the health department does not release identifying details. In Florida data covering 2004 through 2023, wound infections made up 54 percent of cases and seafood exposures 20 percent, with the remaining 26 percent unclassified, Outbreak News Today reported, citing state health data.

Warm Water, Storms and a Longer Exposure Season

The bacterium is a creature of warm, salty, shallow water, and flooding can spread it into places people do not expect. Florida recorded 82 cases and 19 deaths in 2024, when the health department attributed unusual increases in several Gulf Coast counties, including Hillsborough, Pinellas and Lee, to the impacts of Hurricane Helene. In 2022, the year of Hurricane Ian, the state reported 74 cases and 17 deaths.

That history is why floodwater deserves caution after any coastal storm. The Florida Department of Health warns that floodwaters and standing water after a storm pose risks for Vibrio vulnificus exposure. Wading through storm surge or tidal flooding with a cut or scrape carries the same kind of risk as swimming in warm brackish water, and cleanup workers are especially exposed.

The evidence does not point to an unusual outbreak year in Florida. Totals so far remain far below 2024. Louisiana is a different story: state health officials say the state typically sees about 10 cases and one death per year, a level already far exceeded. Because case numbers are small, a few infections can swing yearly totals sharply, and no formal analysis has tied this season's cases to any single environmental cause.

Who Faces the Greatest Risk

Most healthy people who encounter Vibrio vulnificus develop mild illness or none. The danger rises sharply for people with chronic liver disease, which is the strongest risk factor, along with diabetes, cancer, iron overload conditions such as hemochromatosis, and other illnesses or treatments that weaken the immune system. The Florida Department of Health describes these infections as "a serious concern for people who have weakened immune systems."

According to the state health department, bloodstream infections are fatal about half the time, and people with those preexisting conditions are about 80 times more likely to develop them than healthy people. Louisiana health officials warn that nearly one in five people with a Vibrio vulnificus infection dies, sometimes within a day or two of becoming ill, a figure consistent with federal estimates tracked by Fox Weather. Survivors may need intensive care, surgery to remove damaged tissue, or amputation.

Older adults who fish, crab or shuck their own oysters, people with recent cuts or surgical wounds, and residents cleaning up after tidal flooding face added exposure.

Warning Signs and Protective Steps

After contact with seawater or raw seafood, watch for redness, swelling, warmth or severe pain around a wound, especially if it spreads quickly or forms blisters. Fever, chills, vomiting, diarrhea or a sudden drop in blood pressure are also warning signs. Symptoms usually develop within about 24 hours of exposure. Anyone with those signs should seek medical care immediately and tell the provider about recent water or seafood exposure, because prompt treatment improves survival.

To lower risk, stay out of salt or brackish water with open wounds, or cover them with a waterproof bandage. Wash cuts promptly with soap and clean water after exposure. Cook oysters and other shellfish thoroughly, avoid letting raw shellfish juices touch ready-to-eat food, and wear gloves when handling raw seafood. After a coastal flood, keep children and pets out of standing water and clean any scrapes right away. People with liver disease or weakened immune systems should avoid raw oysters entirely.

Florida updates its Vibrio case tables periodically through the season, and Louisiana publishes its own counts. The next updates will show whether cases continue to climb before waters cool in October. Five deaths in Florida and seven in Louisiana are a serious toll, but the overall risk to healthy swimmers remains low, and simple precautions sharply reduce exposure for those most at risk.

What Readers Want to Know

How many Vibrio vulnificus cases and deaths has Florida reported in 2026?

State data released Sept. 24 show five deaths in Bay, Broward, Marion, Palm Beach and Pinellas counties, and 23 confirmed cases from 14 counties.

How do people get infected?

Infections occur when the bacteria enter an open wound during contact with warm salt or brackish water, or when people eat raw or undercooked shellfish, especially oysters. It does not spread from person to person.

Who is most at risk?

People with chronic liver disease face the greatest danger, along with those who have diabetes, cancer, iron overload, or other conditions that weaken the immune system.

What are the warning signs?

Watch for spreading redness, swelling, pain, or blisters around a wound, plus fever, chills, vomiting or diarrhea. Seek care right away and mention any seawater or seafood exposure.

Is it safe to swim at Florida beaches?

Most healthy swimmers are not at serious risk. Health officials advise staying out of the water with open wounds or covering them with waterproof bandages.

Why were cases so high in 2024?

Florida recorded 82 cases and 19 deaths in 2024, and the state health department attributed unusual increases in several Gulf Coast counties to the impacts of Hurricane Helene.