Now that summer has officially begun, millions of tourists are eagerly looking forward to their holidays and, in many cases, heading for the coast to enjoy the beach. However, this year a long shadow hangs over the tourism sector because of the proliferation of bacteria in the sea, which has already forced the closure of several beaches in Spain.
In fact, in recent years, various parts of Europe’s coastline have experienced episodes of pollution and health alerts that have led to restrictions on access to the sea, against a backdrop of ever-warmer water temperatures and mounting tourism pressure.
“The Mediterranean is showing us what a hotter world represents,” says Hatim Aznague, an analyst for Projects, Climate Action and Energy Resilience at the Union for the Mediterranean, speaking to Euronews. “The countries that share this sea can still choose to share a solution.”
The threat of the “flesh-eating bacteria”
Particular concern centres on the Vibrio bacterium, popularly known as the “flesh-eating bacteria”, an aquatic microorganism that lives naturally in marine and brackish waters, especially in areas where rivers meet the sea. According to the European Food Safety Authority (EFSA) (source in Spanish), “Vibrio is an aquatic bacterium that can be found in seafood”, and some strains can cause anything from gastroenteritis to severe and even fatal infections.
The most significant species in Europe include Vibrio vulnificus, Vibrio parahaemolyticus and certain variants of Vibrio cholerae. EFSA warns that these bacteria can cause infections through the consumption of raw seafood or contact between seawater and open wounds.
Bacteria are not the story; they are the messengers. The story is a sea thrown out of balance by heat and pollution.Hatim Aznague Analyst at the Union for the Mediterranean
“Vibrio is a close relative of the bacterium that causes cholera, although the two microorganisms lead to very different diseases,” explains (source in Spanish) the organisation Gavi. “In severe cases, the infection can trigger necrotising fasciitis, in which the tissue around the wound rapidly breaks down. The bacterium can also enter the bloodstream, causing sepsis, and in some cases patients require amputation of the affected limb.”
In addition, the European Centre for Disease Prevention and Control (ECDC) has warned (source in Spanish) of an “increased risk of Vibrio infections throughout the summer season”, especially during heatwaves, such as the one expected in Europe this June, and in shallow coastal waters. The risk is not only a health issue but also an ecological one: these bacteria thrive in environments where the natural balance of the marine ecosystem has been disrupted.
The Mediterranean, a “preview” of climate change
This phenomenon is particularly evident in the Mediterranean Sea, which scientists regard as one of the regions most vulnerable to global warming. Aznague, a specialist in climate and energy policy, warns that the phenomenon is not isolated but structural. “It is important to stress that the Mediterranean is not a victim of climate change, but a foretaste of it. It is one of the fastest-warming seas on the planet.”
The analyst underlines that rising sea temperatures, combined with pollution and lower salinity in coastal areas, create the perfect conditions for pathogens to proliferate. “Warmer water, especially where it is less salty – at river mouths and in the lagoons they enclose – becomes more conducive to pathogenic bacteria.”
Recent reports, such as that of EFSA, warn that “the prevalence of Vibrio in seafood is expected to increase both worldwide and in Europe due to climate change”, particularly in low-salinity waters or estuaries. The Mediterranean, with its intense tourism pressure and rapidly rising temperatures, is thus becoming a key stage for this biological shift.
An economic impact that hits tourism directly
Beyond the health risk, the spread of Vibrio has direct economic consequences. Aznague himself sums it up bluntly: “On our coasts, the shoreline is not part of the economy; it is the economy.”
The closure of beaches or the issuing of health alerts at the height of the season directly affects one of Europe’s most important economic engines: beach tourism. “A closed beach is a climate impact that comes with a bill attached,” the analyst notes, also warning of the cost of “a reputation that takes years to rebuild.”
The Mediterranean is the most visited tourist region in the world, which amplifies the impact of any temporary closure. Hotels, restaurants and local economies depend directly on the stability of the coastline, which is now threatened by increasingly frequent biological phenomena.
According to EFSA, rising temperatures and extreme weather events are multiplying high-risk areas, while antimicrobial resistance detected in some strains adds another layer of concern for public health.
A present risk, not a future one
For the Union for the Mediterranean (source in Spanish), the problem no longer belongs to the climate’s future, but to its present. This sea acts as a global thermometer of what could happen in other regions in the coming decades.
The solution, Aznague insists, lies in committing to greater cooperation and adopting coordinated action, stressing: “It is not acceptable to compromise on our health or on the climate.”
In this context, the Vibrio bacterium is not only a growing health threat but also an indicator of a marine ecosystem undergoing dizzyingly rapid change. Or, as Aznague sums it up during the interview: “Bacteria are not the story; they are the messengers. The story is a sea thrown out of balance by heat and pollution.”
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