Vibrio Bacteria Pushing North To Seas Once Too Cold To Support It, Like Gulf Of Maine; +/- 100 Fatalities/Year In US
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A small number of Vibrio species can sicken and even kill. In worst-case scenarios, a person who has been exposed to the most dangerous of them – by swimming in brackish water with an open wound or ingesting a piece of raw shellfish that is contaminated with the toxin – may find themselves with only hours before the flesh on one or more extremities starts to bruise, swell and decay. Without the quick aid of powerful antibiotics, septic shock can set in and lead to death. Anyone can get infected, though it is much more likely in people who have liver disease or are immunocompromised, elderly people or people who are diabetic.
The climate crisis is making the world’s oceans, which have absorbed more than 90% of the excess heat trapped by greenhouse gas emissions, more hospitable to Vibrio. Research shows temperature and salinity are the largest predictors of how widespread Vibrio bacteria are. As water temperatures rise, so does the concentration of Vibrio in seawater – boosting the risk of infection for beachgoers and shellfish consumers. The bacteria start getting active in water temperatures above 60F and multiply rapidly as coastal waters warm throughout the summer.In recent years, scientists have documented Vibrio expanding into places that were once too cold to support the bacteria, pushing as far north along the US east coast as Maine and appearing with more prevalence in temperate seas around the world.
Vibriosis infections in general are the leading cause of shellfish-related illness in the US They have increased “more than any other illness caused by a pathogen in the US food supply” since the Centers for Disease Control and Prevention, or CDC, started keeping tabs on such illnesses in 1996, according to a 2019 analysis by the International Association for Food Protection. The report attributed the precipitous rise to a “perfect storm” of factors that include the climate crisis, food handling practices, expanding globalization, a patchwork of regulatory oversight and improved diagnosis. On their conspicuous expeditions to Pensacola and other Sunshine state beaches, Magers and Kumar are trying to understand where, and when, harmful Vibrio species are present across the state. The research they’re doing is part of an ongoing effort by a laboratory at the University of Florida to create a Vibrio early warning system for the eastern US – a program that can alert public health departments to high Vibrio concentrations in any given area a month in advance.
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The CDC estimates that about 80,000 cases of vibriosis occur in the US every year, resulting in about 100 deaths. Of those 80,000 cases, most are caused by a Vibrio called parahaemolyticus, which most commonly results in gastroenteritis, or food poisoning. The vast majority of the deaths, however, are caused by a type of Vibrio called vulnificus – the Latin word for “wound-making.” Vulnificus is so potent it can squeeze through a pinhole-sized cut in the skin and lead to death within just 24 hours. In the last five years, the CDC registered 429 such vulnificus cases, plus 136 foodborne cases. But even though foodborne cases are fewer, the patients that contract vulnificus by eating contaminated shellfish are more likely to die than those infected via open wounds. Thirteen percent of those non-foodborne cases died, compared with 32% of people who got the infection from eating seafood. Most cases occur in the Gulf and Atlantic coastal regions.
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https://www.theguardian.com/environment/2026/may/10/vibrio-bacteria-east-coast-climate-change
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great news every day. We be FUBAR. 
