Health officials warn of expanding Vibrio bacteria risk in northern waters

Health authorities are alerting the public that Vibrio vulnificus, a bacterium that thrives in warm salt and brackish water, has been identified in several Long Island waterways, extending its known range beyond the Gulf Coast. While the overall risk to healthy beachgoers remains low, the infection can become life-threatening for individuals with open cuts, recent surgeries, piercings, tattoos or underlying conditions such as liver disease, diabetes, cancer or weakened immune systems.

The bacteria can enter the body through skin wounds or by consuming raw or undercooked shellfish, particularly oysters. The Centers for Disease Control and Prevention estimates that about 20% of infected people die, often within one or two days of symptom onset. In Florida, eight cases have been reported this year through early June, up from five during the same period last year, and Mississippi officials have also issued precautionary advisories.

A recent severe case involved a man from southern Mississippi who developed a rapidly spreading infection after a bite-like wound while fishing; he remains in critical condition. > "It is pretty much a life-threatening infection, but also it’s a surgical and medical emergency," said Dr. Carlos Arias of Encompass Health.

Officials recommend avoiding warm coastal water if any skin injury is present, covering wounds, thoroughly cooking shellfish and seeking immediate medical care for symptoms such as redness, swelling, severe pain, blisters or rapid deterioration after water exposure. The CDC advises clinicians to begin treatment promptly when Vibrio infection is suspected, without waiting for laboratory confirmation.

Experts also expressed concern that recent reductions in federal monitoring programs could hinder detection of emerging threats, though the CDC says it continues surveillance through alternative national systems.