There’s a concerning outbreak of saltwater bacteria causing issues along the Gulf Coast.
This year, there have been multiple cases of Vibrio vulnificus, with nine fatalities reported across Florida, Louisiana, North Carolina, Alabama, and Mississippi.
This rod-shaped bacterium thrives in warm, brackish waters, often entering the body through the consumption of raw or undercooked shellfish, particularly oysters.
“Vibrio can lead to serious infections, including invasive soft tissue infections—sometimes referred to as ‘necrotizing fasciitis’ or ‘carnivorous bacteria’—and bloodstream infections,” explained Dr. Andrew Handel, a pediatric infectious disease expert at Stony Brook Children’s Hospital.
Here’s some essential information about this rare but serious infection:
What is Vibrio vulnificus?
Vibrio vulnificus made its first appearance in medical literature back in 1976, although it’s believed to have existed much earlier.
It’s a member of the larger Vibrio family, which resides in coastal waters.
This group includes Vibrio Cholerae, known for causing cholera-related diarrhea.
“There are over 200 types of marine vibrios, but only a handful of them are linked to significant health issues, including foodborne diseases and skin infections,” stated the North Carolina Department of Health and Welfare.
This bacterium requires a salty environment to survive, which is why it is commonly found in areas where warm seawater mingles with fresh water.
“It thrives in warm conditions, which is why we tend to see peaks during the summer—particularly in the southern U.S. along the Gulf Coast,” Handel noted.
Where have cases been reported?
As of July 24, the Florida Department of Health reported four deaths and 13 cases this year.
In comparison, there were 82 cases and 19 deaths last year, and as of recent reports, 46 cases and 11 deaths have been recorded in 2023.
Authorities are focusing on a notable rise in infections in parts of Florida, particularly following Hurricane Helen in September 2024.
In Louisiana, as of July 30, there were 17 cases, four of which resulted in death. This is striking, as the state usually sees around seven cases and deaths annually, likely due to rising water temperatures and increased extreme weather events.
Most cases—around 75%—arise from wounds exposed to seawater.
As of July 31, North Carolina reported 59 vibrio cases, including one death. This data encompasses various strains of Vibrio infections.
The Mississippi Department of Health confirmed 13 cases this year, down from 50 the previous year, with no deaths reported in either 2024 or 2025.
Consumption of contaminated seafood seems to be a common source of infection, particularly cases related to Vibrio parahaemolyticus, which typically causes diarrhea.
Alabama noted 18 cases of Vibrio this year so far, while local reports mentioned there were 54 cases the previous year.
What are the symptoms?
Symptoms associated with Vibrio vulnificus depend on the infection type. For instance, exposing open cuts to contaminated water can result in high fever, severe pain, swelling, and redness around the affected area.
Dr. Handel explained that symptoms of skin infections can escalate rapidly.
Soft tissue infections could also lead to skin breakdown, ulcers, and fluid-filled blisters, with severe cases possibly resulting in significant tissue damage.
If contaminated shellfish are consumed, the symptoms may include intense vomiting or diarrhea, which risks dehydration, alongside stomach pain, fever, and chills.
Once in the bloodstream, Vibrio vulnificus can lead to a swift and severe illness. It can cause symptoms such as fever, chills, dizziness, confusion, dangerously low blood pressure, rapid heart rates, and severe skin lesions.
The Florida Department of Health has indicated that bloodstream infections may have a fatality rate of around 50%.
The risk for life-threatening complications increases for older adults and those with weakened immune systems, particularly individuals with chronic liver disease.
There’s no evidence suggesting that Vibrio spreads from person to person.
How is Vibrio vulnificus treated?
Diagnosis typically involves testing blood, wound fluids, or stool samples.
Immediate antibiotics are often administered, and in serious cases, amputation may be necessary to remove infected or dead tissue.
What can you do to protect yourself from infection?
Dr. Handel advises steering clear of open waters like oceans, rivers, and estuaries if you have any cuts or scrapes.
“To avoid food poisoning from Vibrio, it’s best to skip raw shellfish, particularly for those with weakened immune systems or chronic liver issues,” he added.
And if you do indulge in shellfish, consuming it quickly is key.
