Gulf Coast Vibrio Surge Prompts Beachgoer Health Warnings
Health officials are urging Gulf Coast beachgoers to take precautions during a summertime surge in infections from Vibrio vulnificus, a potentially deadly bacterium found in coastal waters. Louisiana has confirmed nine cases of the infection this year, all resulting in hospitalization and five proving fatal, according to AP News. During the same period over the previous decade, the state averaged seven cases and one death.
Florida has reported 14 Vibrio vulnificus cases and two deaths so far this year, compared with 33 cases and five deaths for all of 2025, according to the Florida Department of Health. The second death was reported in Marion County, following an earlier fatality in Palm Beach County.
A Deadly Bacterium in Warm Waters
Vibrio bacteria thrive in seawater and in the brackish mix of fresh and saltwater found in estuaries and lagoons. Most infections are reported from May to October, and most occur in states along the Gulf Coast. Doctors say the Gulf is an ideal environment with the right amounts of salt and heat to let this organism proliferate.
Vibrio vulnificus is the most deadly type of Vibrio bacteria, according to the Centers for Disease Control and Prevention. As many as one in five of those infections are fatal, a much higher rate than other types of Vibrio bacteria. The bacterium can cause necrotizing fasciitis—the so-called “flesh-eating” infection—and fatalities can occur as soon as 48 hours following exposure.
All nine Louisiana cases this year were associated with wounds exposed to seawater, and all patients had underlying health conditions, according to WAFB, which covered the Louisiana Department of Health’s press conference. LDH epidemiologist Dr. Theresa Sokol said the number of cases is not unusual for this time of year, but the death toll is.
“If you have a wound, it’s really important that you either stay out of salt or brackish water or make sure it is well covered with a waterproof bandage if you are going to go into salt or brackish water or if you’re going to have contact with raw seafood or its juices,” Sokol said.
Rising Toll Across the Gulf Coast
The 2026 outbreak follows a deadly 2025 season. Louisiana recorded five deaths from the bacterium among at least 26 people who were infected, all of whom were hospitalized, according to The Guardian. One of those who died, Basil Kennedy, 77, became sick after he scraped his leg on a boat trailer then entered the water; he died three days later.
In Florida, the latest data shows cases spread across 10 counties, with the newest reported in Brevard and Marion counties, according to the Ocala Star Banner. The Brevard victim is between 10 and 14 years of age—the county’s first case this year—while the Marion victim is between 60 and 64.
The human toll of these infections is starkly illustrated by the story of Joziah Thompson, a 17-year-old from Niceville, Florida, who contracted Vibrio vulnificus through a scrape on his leg while swimming at a local park in June. Within two days, his leg became red and painful, and he was rushed to the hospital for emergency surgery, according to WJHG.
“Two days later and his entire leg was red, he was moaning and hot to the touch and in a lot of pain,” said his mother, Tirzah Thompson. “As soon as I looked at his leg I said, ‘Oh, we need to go now.’”
Florida health officials have warned that the risk of exposure increases after severe weather events like storms and hurricanes that push brackish water inland. Tropical Storm Bertha made landfall in southern Louisiana on July 22, pushing water into streets in some coastal communities. Records show more cases in years when Florida is hit by tropical storms and hurricanes—in 2024, the year of Hurricanes Helene and Milton, Florida reported 19 deaths from Vibrio vulnificus.
Climate Change Driving Northward Spread
Scientists say climate change is helping the bacteria proliferate and spread northward. A 2023 study published in Scientific Reports analyzed a 30-year database of Vibrio vulnificus cases for the Eastern USA and found that wound infections increased eightfold between 1988 and 2018, with the northern case limit shifting northward approximately 48 kilometers (about 30 miles) per year.
The study projects that by 2041-2060, Vibrio vulnificus infections may expand their range to encompass major population centers around New York, and annual case numbers may double as temperatures rise and the elderly population grows. By 2081-2100, infections may be present in every Eastern USA state under medium-to-high future emissions and warming.
“In the 1980s, Vibrio abundance would increase in the late spring and stay high through the summer and drop in the middle of October,” Kyle Brumfield, a microbiologist at the University of Maryland, told The Guardian. “Now… we can pretty much find them almost year-round.”
Researchers at the University of Florida are developing a Vibrio early warning system that can predict vibriosis risk in any given coastal county a month in advance, using satellite data on water temperature and salinity paired with CDC surveillance data.
How Beachgoers Can Protect Themselves
Vibrio vulnificus can enter the body through unhealed cuts and scrapes, recent piercings and tattoos, and recent surgical incisions. Health officials recommend that people with open wounds stay out of brackish or salt water entirely, or cover wounds with a waterproof bandage if contact is unavoidable.
People should immediately wash cuts and scrapes thoroughly with soap and clean running water after coming in contact with coastal waters or raw seafood, the CDC said. They should see a doctor if they develop symptoms such as fever, chills, and hot red areas on the skin that start to turn dark and blister.
Oysters are a particular risk, and there is no way to tell if an oyster is contaminated just by looking at it. People should wash hands with soap and water after handling raw shellfish and wear protective gloves if they have a weakened immune system.
Those at highest risk include people with liver disease, cancer, diabetes, HIV, or thalassemia; those receiving immunosuppressant therapy; people taking medication that decreases stomach acid levels; and those who have had recent stomach surgery.
“Seek medical care immediately if a wound exposed to brackish or salt water becomes red, swollen, painful, warm or discolored,” Louisiana health officials said in their news release. “Tell the health care provider about the water exposure.”
What to Watch For
As summer temperatures peak and hurricane season intensifies, health officials expect Vibrio vulnificus cases to remain elevated along the Gulf Coast. Louisiana’s Department of Health will begin posting weekly Vibrio vulnificus case data through its Public Health Data Spotlight webpage, according to WLOX.
For beachgoers, the message from health officials is clear: enjoy the water, but be aware of the risks—especially if you have any open wounds or underlying health conditions. As ABC News reported, the bacterium can cause severe and life-threatening infections that may require intensive care or limb amputation.
The broader picture is one of a changing climate reshaping public health risks along America’s coastlines. As waters warm and the bacteria’s range expands northward, the Gulf Coast surge may be an early warning of a larger trend—one that will require increased awareness and preparedness from both individuals and public health systems.