If you’ve seen headlines about “flesh-eating bacteria” in Louisiana lately, there’s a good chance they’re talking about Vibrio vulnificus.
The name sounds scary, and some of the headlines are even scarier. But before you swear off the beach forever, it helps to understand what Vibrio actually is, how people are exposed, and which symptoms deserve immediate attention.
Louisiana is currently seeing an increase in severe Vibrio vulnificus infections. According to the Louisiana Department of Health, 10 cases have been reported among Louisiana residents in 2026 as of August 12. Five have resulted in death.
Here’s what Louisianans should know.
What is Vibrio?
Vibrio is a group of bacteria that naturally live in certain coastal waters. One species, Vibrio vulnificus, can cause serious illness in humans.
The bacteria are found in higher concentrations when coastal waters are warmer, which makes the summer months particularly important for people who live, fish, swim, and vacation along the Gulf Coast.
And despite the nickname you may have heard, Vibrio vulnificus isn’t technically “the flesh-eating bacteria.”
Some Vibrio vulnificus infections can lead to necrotizing fasciitis, a rare but very serious infection that causes tissue around a wound to die. However, the CDC notes that several different types of bacteria can cause necrotizing fasciitis, not just Vibrio.
How Do You Get a Vibrio Infection?
There are two primary ways people can become infected:
Through an open wound. Infection can occur when a cut, scrape, recent surgical wound, piercing, tattoo, or other break in the skin comes into contact with salt water or brackish water.
By eating contaminated seafood. Vibrio infection can also occur after eating raw or undercooked seafood, particularly oysters.
For Louisiana’s reported Vibrio vulnificus cases so far in 2026, LDH reports that all 10 involved wound or seawater exposure.
I Went Swimming With a Cut. Should I Panic?
No.
Having a small cut and going into coastal water does not mean you’ll develop a Vibrio infection. These infections are still uncommon.
But you shouldn’t ignore the exposure either.
If a wound comes into contact with salt or brackish water, wash it thoroughly with soap and clean running water. If you know you have an open wound before heading into the water, the safest option is to stay out until it heals. If contact can’t be avoided, cover the wound completely with a waterproof bandage.
This applies to more than just obvious injuries. The CDC considers recent surgery, piercings, and tattoos potential open wounds, too.
What Does a Vibrio Wound Infection Look Like?
This is where paying attention matters.
Signs of a Vibrio vulnificus wound infection can include:
- Increasing redness around the wound
- Pain
- Swelling
- Warmth
- Skin discoloration
- Fluid or drainage from the wound
- Fever
Vibrio infections can progress rapidly. If you’ve recently been in salt or brackish water and a wound becomes increasingly painful, red, swollen, warm, discolored, or begins draining, seek medical attention promptly and tell your healthcare provider about the water exposure.
That last part matters. Knowing that a wound was exposed to coastal water can help your healthcare provider determine what may be causing the infection.
How Do I Know if It’s Vibrio?
The tricky part is that you can’t tell whether a wound is infected with Vibrio just by looking at it. Early symptoms like redness, swelling, warmth, and pain can look similar to other skin and wound infections.
One of the biggest clues is what happened before the symptoms started.
If you recently had a cut or other break in your skin exposed to salt or brackish water and the area begins getting increasingly painful, red, swollen, warm, or discolored, tell your healthcare provider about the water exposure. This is especially important if symptoms worsen quickly.
If a healthcare provider suspects a Vibrio infection, they may collect a sample from the wound, blood, or both for lab testing. However, treatment for a serious suspected infection may need to begin before test results are available.
The bottom line: don’t wait for a wound to “look like Vibrio.” There isn’t one specific appearance that confirms it. Recent coastal water exposure combined with a rapidly worsening wound is enough reason to seek medical attention promptly.
Who is Most at Risk for Severe Illness?
Anyone can develop a Vibrio infection, but certain people are more likely to develop severe complications.
According to the Louisiana Department of Health, risk can be higher for people with certain underlying medical conditions or treatments, including liver disease, diabetes, cancer, HIV, thalassemia, immune-suppressing therapy, certain stomach conditions or surgeries, and medications that reduce stomach acid.
People at higher risk should be especially cautious about exposing wounds to coastal water and consuming raw or undercooked seafood.
What About Raw Oysters?
Unfortunately, this is one of those times when “I’ve eaten them my whole life and never gotten sick” isn’t much of a safety strategy.
Vibrio naturally occurs in coastal waters and can be present in oysters. You cannot reliably tell whether an oyster contains harmful bacteria by looking at it, smelling it, or tasting it.
Cooking shellfish thoroughly is the best way to reduce your risk of Vibrio infection.
People who are at increased risk of severe infection should be particularly cautious about eating raw or undercooked oysters and other shellfish.
When is it an Emergency?
A mild skin irritation and a rapidly progressing infection are very different things.
Seek emergency medical care for symptoms such as:
- Rapidly spreading redness or swelling
- Severe or rapidly worsening pain
- Blisters or significant skin discoloration
- Fever or chills with a worsening wound
- Dizziness, confusion, fainting, or weakness
- Signs of very low blood pressure or severe illness
Vibrio vulnificus infections can become life-threatening quickly. The CDC reports that about one in five people with a Vibrio vulnificus infection dies, sometimes within just a day or two of becoming ill.
Enjoy the Water, Just Know What to Watch For
Living in Louisiana means coastal water and seafood are part of life for many of us. The goal isn’t to make everyone afraid of the Gulf or their next plate of oysters.
It’s knowing how to reduce your risk.
Avoid exposing open wounds to salt or brackish water, cover wounds when exposure can’t be avoided, wash any exposed cuts thoroughly afterward, cook seafood properly, and pay attention to changes in a wound after you’ve been in coastal water.
Most importantly, don’t wait on a wound that’s getting worse quickly. If something doesn’t look or feel right after water exposure, getting evaluated early can make a significant difference.