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Vibrio v. - The Flesh Rotting
Bacteria in Salt Water

by Gary Ralston

(this article is free to copy and use on your website to help inform fishermen about Vibrio infections. A link back to is all that's asked.)


lunar phases

If you are healthy, is the chance of a Vibrio infection from a saltwater source something you need to worry about? Probably not.

Those in high risk groups, however, are more susceptible to this organism and should be aware of the risk they take by exposing open wounds, even small cuts to salt water.

If you are in a high risk group, is it something you need to be prepared for? The answer is YES!

Vibrio vulnificus is a bacterium found in salt water, and infections from it can lead to amputations and even death. No doubt this organism receives a lot of attention in the press when a someone becomes infected by it, making some ask whether it's even safe to touch salt water.

The good news is that millions of people are exposed v. vulnificus annually and do not become infected. The average number of confirmed cases on the Gulf coast each year, according to the Centers for Disease Control and Prevention, is 40, with 35 requiring hospitalization and 12 resulting in death.

Small numbers in comparison to the total exposures but not much consolation to those that have been infected. However, compare that to the number of food borne diseases which is estimated to cause 6 million to 81 million illnesses and up to 9,000 deaths each year in the United States alone.

Theories relating to increased pollution in the bays as causes for the infections have been circulated but don't hold water. This organism is not related to pollution. It is naturally occurring and particularly plentiful in the warm summertime waters along the entire Gulf coast. Test a sample of salt water for V. vulnificus and you will likely find it present.

The bacteria is more concentrated in places that receive little tidal flow, such as shallow ponds and lakes connected to a bay. The bacteria also likes brackish water, where salt and fresh water mix. What it doesn't survive well in is salty water such as that in the Gulf, or bay areas that receive good tidal flow. That's not to say the bacteria won't be found in these areas, it just won't be as concentrated.

V. vulnificus not only enters the body through cuts or punctures from infected surfaces, raw or inadequately cooked seafood on which it is present can also cause a problem. Even healthy people can suffer from gastroenteritis if they eat seafood contaminated with this organism. For those with liver disease, it is fatal 50% of the time.

People in high risk groups, including the elderly, those with impaired liver function, diabetes, or who use immunosuppressive drugs or steroids, or on chemo, are particularly susceptible to infection from v. vulnificus. Since alcohol impairs the liver's ability to fight infection, that too should be considered a risk factor, particularly if consumed while on the water.

The suggested approach preventing an infection is to generously clean any wound (A wound includes a rash or blister, say from waders or shoes.) with hydrogen peroxide and/or apply an anti-bacterial ointment, such as a triple antibiotic cream. It's a very good idea to have these two items available while on the water so there is no delay in treatment.

Once in the body and an infection takes hold, the organism spreads very rapidly and can double in numbers in a matter of every 20 to 30 minutes. Doctors advise seeking immediate medical attention if symptoms of a spreading infection such as expanding redness, fever and pain occur. If you develop these symptoms that means not waiting until morning to see if it gets better.

The season for V. vulnificus infections begins in earnest when bay waters start to warm. On the Gulf coast, this will begin in March and usually peak by mid-October.

Anyone growing up on the Gulf coast probably remembers being told that saltwater was good for healing open wounds. Football practice always meant bloody knees and elbows so it was a good reason to go swimming or wadefishing at every opportunity. I don't know if it made any difference as far as healing goes, but I sure wouldn't try it anymore.

For more information on V. vulnificus, or the other members in its nasty little family, including cholera, visit the Center for Disease Control at

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