Rising temperatures really are the gift that keeps on giving…, aside from melting glaciers, straining electricity grids and fuelling wildfires, Europe now has yet another heat-related concern to add to the list: a flesh-eating bacterium thriving in warming seas.
The little critter appears to be moving a little too close to Europe’s shores for comfort, and could become a serious hazard for the millions heading to the coast in search of relief from one heatwave after another as we officially enter the summer holidays this week.
Known scientifically as the Vibrio bacterium, this microorganism is found in warm, brackish coastal waters, a mix of fresh and salt water found in estuaries, lagoons and river mouths, precisely the kind of shallow, warmer waters where children often like to swim.
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Not unlike other families, not all Vibrio bacteria are a hazard, and most are harmless. This one’s black sheep is Vibrio vulnificus, dubbed the “flesh-eating bacteria” by the media, which can cause severe skin infections. In rare cases, it may prove fatal, particularly in people with open wounds, weakened immune systems or chronic liver disease.
A recent study from the Gulf of Gdańsk found V. vulnificus most commonly hitching rides on medical waste, plastic film and cigarette butts floating in coastal waters, but not on food packaging, in other words, on the detritus people leave in and around the sea.
European institutions are worried. In the most severe cases, untreated infections can lead to necrotising fasciitis – a rare condition in which bacteria rapidly destroy skin, fat and tissue surrounding muscles – as well as bloodstream infections, sepsis and even amputations, according to the European Centre for Disease Prevention and Control (ECDC). The agency warned of an “increased risk of Vibrio infections throughout the summer season”, particularly during heatwaves.
“The Mediterranean is showing us what a hotter world represents,” Haim Aznague, analyst for Projects, Climate Action and Energy Resilience at the Union for the Mediterranean, told Euronews, suggesting that countries bordering the sea may eventually need a coordinated response.
The European Food Safety Authority (EFSA) warned that Vibrio can also be found in seafood, with some strains causing gastroenteritis and, in severe cases, fatal infections. The ECDC advises avoiding raw or undercooked shellfish, especially oysters.
The Mediterranean is among the fastest-warming seas on the planet, heating roughly 20% faster than the global ocean average, creating ideal conditions for harmful bacteria.
Europe has recorded a rise in Vibrio infections over the past two decades, and global numbers are expected to climb. The highest concentrations are currently found in the Baltic Sea, the Baltic-North Sea transition waters and the Black Sea, as well as coastal areas near major river inflows.
Aznague describes the Mediterranean as a “preview of climate change” rather than simply one of its victims.
No European beaches have yet been closed because of Vibrio, but closures linked to pollution and other health alerts have become increasingly familiar in recent years.
Such measures affect not only holidaymakers but also local economies that depend heavily on summer tourism, from hotels and restaurants to water sports operators and other coastal businesses.
“A closed beach is a climate impact that comes with a bill attached”, warns Aznague, adding that “a reputation that takes years to rebuild”.
The Mediterranean was Europe’s most visited tourist region in 2024, recording 747 million international arrivals according to UN Tourism data. The ECDC now uses an interactive map, updated daily with a five-day forecast, to track the spread of the bacteria across European waters.
