Louisiana health officials have issued a summertime advisory that reads like the opening of a horror movie: the state is seeing a surge in infections from Vibrio vulnificus, a flesh-eating bacterium that thrives in the warm, salty waters of the Gulf. So far this year, nine cases have been confirmed, with all nine hospitalized and five dead. To put that in perspective, the state's average over the previous decade was seven cases and one death for the same period. So, you know, statistically speaking, your odds are still great - unless you're one of the five.

The Louisiana Department of Health's advice is straightforward: "Seek medical care immediately if a wound exposed to brackish or salt water becomes red, swollen, painful, warm or discolored." Because nothing says 'fun in the sun' like monitoring a scrape for signs of necrotizing fasciitis.

Vibrio bacteria are aquatic party crashers, flourishing in seawater and the brackish mix of fresh and saltwater found in estuaries and lagoons. The Gulf, with its ideal salt and heat, is basically a five-star resort for these organisms. Most infections occur from May to October, which conveniently aligns with beach season. The deadliest strain, Vibrio vulnificus, kills about one in five infected, according to the CDC. That's a mortality rate that would make even the most stoic epidemiologist raise an eyebrow.

While infections remain exceptionally rare compared to, say, the common cold, the bacterium is a fast worker once inside the body. It can cause bruising, swelling, and tissue decay within hours, leading to septic shock and death unless treated promptly with powerful antibiotics. Last year, Louisiana saw five deaths among at least 26 infections, all hospitalized. One victim, 77-year-old Basil Kennedy, scraped his leg on a boat trailer, went into the water, and was dead three days later. A cautionary tale for anyone considering a swim with an open wound.

Florida, not to be outdone, has reported 14 cases and two deaths so far this year, compared to 33 cases and five deaths for all of last year. The bacteria can also be contracted by eating raw or undercooked shellfish, particularly oysters. So maybe skip the raw bar and stick to the fried variety.

Severe cases are more common in the elderly, those with weakened immune systems, and people with liver disease, diabetes, or certain chronic illnesses. But healthy individuals aren't entirely immune to being the protagonist in a medical drama.

And here's the kicker: scientists say climate change is helping these germs proliferate and spread northward. A 2023 study found that the northernmost case has been shifting by about 30 miles each year, and cases overall are rising. Eventually, the northward march might bring infections near population centers like New York. So, as if you needed another reason to worry about climate change, add 'flesh-eating bacteria moving to a coastline near you' to the list.

The CDC recommends washing cuts and scrapes thoroughly with soap and clean running water after contact with coastal waters or raw seafood. Also, maybe consider wearing water shoes and not scraping your leg on boat trailers. Just a thought.