A deadly bacteria is creeping up the Atlantic Coast. How worried should you be?

Scientists at the University of Florida are tracking the spread of *Vibrio vulnificus*, a flesh-eating bacteria expanding along the U.S. coastline. The bacteria, which thrives in warm, brackish water, is moving northward at a rate of 30 miles per year, with climate change worsening its reach. Researchers are working on a predictive model to alert public health officials a month in advance of high-risk areas, as infections—including 80,000 annual cases of vibriosis—pose growing threats beyond the Gulf Coast. The bacteria can enter the body through open wounds or contaminated raw shellfish, leading to severe infections that may cause tissue decay within hours. While most vibriosis cases are caused by *Vibrio parahaemolyticus*, resulting in food poisoning, *V. vulnificus* is responsible for nearly all fatalities. The CDC reports 429 wound-related cases and 136 foodborne cases in the past five years, with a 32% mortality rate for those infected through seafood consumption. Fieldwork on Pensacola Beach last August revealed researchers collecting seawater samples to monitor water quality, including *Vibrio* levels. A local woman inquired about the bacteria, unaware of its dangers, while scientists noted her open wounds before she waded into the ocean. The bacteria’s spread inland during hurricanes further escalates risks, turning a once-regional threat into a national public health concern. *Vibrio* species originated in ancient marine ecosystems and now thrive in coastal environments, attaching to plankton, algae, and shellfish. Vulnerable populations—those with liver disease, weakened immune systems, diabetes, or the elderly—face higher risks. Without rapid antibiotic treatment, infections can lead to septic shock and death, underscoring the urgency of early detection systems. Public health officials emphasize caution when swimming with open wounds or consuming raw shellfish in affected areas. The University of Florida’s early warning system aims to mitigate outbreaks by providing advanced notice to coastal communities, reducing exposure risks as the bacteria’s range continues to expand.