Flesh‑Eating Bacteria Are Devouring Limbs in Warming Waters Worldwide − Here’s How to Protect Yourself

Why Are Flesh-Eating Bacteria Infections Rising?
Vibrio vulnificus is found in warm coastal waters around the world, like those of the southern Gulf Coast states in the U.S. But rising ocean temperatures due to global warming are creating new habitats for this type of bacteria, which can now be found along the East Coast as far north as New York and Connecticut. A recent study noted that Vibrio vulnificus wound infections increased eightfold between 1988 and 2018 in the eastern U.S.

Vibrio vulnificus is also spreading into coastal areas of Northern Europe and the Baltic Sea as a consequence of climate change driving warming water temperatures.

Climate change is also fueling stronger hurricanes and storm surges, which have been associated with spikes in flesh-eating bacteria infection cases due to increasing contact with seawater or brackish water.

The number of people around the world who are most vulnerable to severe infection, including those with diabetes and those taking medications that suppress immunity, is on the rise.

What Are Symptoms of and Treatments for Necrotizing Fasciitis?
Early symptoms of an infected wound include fever, redness, intense pain or swelling at the site of injury. If you have these symptoms, seek medical attention without delay. Necrotizing fasciitis can progress quickly, producing ulcers, blisters, skin discoloration and pus.

Treating flesh-eating bacteria is a race against time. Clinicians administer antibiotics directly into the bloodstream to kill the bacteria. In many cases, damaged tissue needs to be surgically removed to stop the rapid spread of the infection. This sometimes means amputating affected limbs.

Researchers are concerned that an increasing number of cases are becoming impossible to treat because Vibrio vulnificus has evolved resistance to certain antibiotics.

How Do I Protect Myself?
The CDC offers several recommendations to help prevent infection.

People who have a fresh cut, including a new piercing or tattoo, are advised to stay out of water that could be home to Vibrio vulnificus. Otherwise, the wound should be completely covered with a waterproof bandage. The tiniest scrape or cut is enough for Vibrio vulnificus to get under your skin. One case was even traced to freshly shaven legs.

People with an open wound should also avoid handling raw seafood or fish. Wounds that occur while fishing, preparing seafood or swimming should be washed immediately and thoroughly with soap and water.

Anyone can contract necrotizing fasciitis, but the elderly and people with weakened immune systems are most susceptible to severe disease. This includes people taking immunosuppressive medications or those who have pre-existing conditions such as liver disease, cancer, HIV or diabetes.

It is important to bear in mind that necrotizing fasciitis presently remains very rare. But given its severity, it is beneficial to stay informed.

Cases of infection by Vibrio vulnificus are about as rare as shark attacks. While shark bites get more attention, the microscopic shark that is Vibrio vulnificans can also rob you of life or limb.

Bill Sullivan is Professor of Microbiology and Immunology, Indiana University. This article is published courtesy of The Conversation. This is an updated version of an article originally published on Sept. 25, 2023.