Suitcase Viruses: Chikungunya and Dengue Raise Fears Across Europe’s Tourist Hotspots

Published: 19th August 2025 .The English Chronicle Desk

European health authorities are raising fresh concerns over the growing threat of so-called “suitcase viruses” as outbreaks of chikungunya and dengue fever spread across popular holiday destinations. Both illnesses, transmitted by infected aedes mosquitoes, are increasingly being detected in parts of Europe, heightening the risk that travellers could inadvertently carry them into countries such as the United Kingdom.

Medical experts warn that these mosquito-borne viruses often go unnoticed in transit, travelling with infected individuals or via vectors concealed in luggage, and can establish new transmission chains in regions not traditionally affected. Britain’s Health Security Agency (UKHSA) has already sounded the alarm, reporting a worrying rise in chikungunya cases among travellers returning from overseas. The trend has reignited debate on whether Europe is fully prepared to deal with tropical diseases that are becoming increasingly common due to globalisation and climate change.

Chikungunya, described by specialists as a “nasty disease,” is notorious for causing debilitating joint and muscle pain, intense headaches, sensitivity to light, and severe skin rashes. Although not usually fatal, the virus poses a heightened risk to vulnerable groups such as children, the elderly, and those with chronic health conditions. China recently reported more than 7,000 cases in Foshan, in Guangdong province, though officials say infection rates are now declining.

Dengue fever, meanwhile, has long been one of the most feared mosquito-borne illnesses due to its potential to escalate rapidly. In its milder form, dengue produces fever, rashes, and fatigue lasting around a week. Severe dengue, however, can result in internal bleeding, shock, organ failure, and even death. Health agencies estimate that one in 20 people infected with dengue will develop life-threatening symptoms within hours of onset. In 2024 alone, nearly 1,000 cases of dengue were recorded among travellers returning to England, Wales, and Northern Ireland, a sharp rise compared with the previous year.

The European Centre for Disease Prevention and Control (ECDC) has now identified France, Italy, and Portugal as the three current hotspots for chikungunya and dengue. Since January, France has reported 111 locally acquired chikungunya cases across 22 separate clusters, with significant concentrations in areas such as Vitrolles, Salon-de-Provence, Castries, and Grosseto-Prugna. The situation has worsened in recent weeks, with 48 new cases confirmed within just seven days. Italy has also reported fresh outbreaks, with clusters emerging in Modena and Verona, while Portugal registered two dengue cases earlier in the year on the island of Madeira.

For holidaymakers planning summer travel, the developments have prompted questions over safety. Health experts stress that most European cases remain “imported” infections, linked to returning travellers from Africa, Asia, or South America. Yet the increasing presence of the Asian tiger mosquito (aedes albopictus) across the continent has allowed local transmission to take root, raising the spectre of seasonal outbreaks in southern Europe.

Despite the concerning rise in infections, health authorities continue to insist that it is safe to travel to countries with reported cases, provided precautions are taken. Preventing mosquito bites remains the single most effective defence against both chikungunya and dengue. The UKHSA advises travellers to use insect repellent, wear light-coloured long-sleeved clothing, and sleep under mosquito nets when visiting high-risk areas.

As Europe enters the late summer travel season, the spread of these so-called suitcase viruses has become a stark reminder of how quickly diseases can transcend borders. For governments and public health agencies, the challenge lies not only in managing localised outbreaks but also in preparing for the long-term risks posed by global mobility and shifting climates. For travellers, vigilance and prevention remain the key to staying safe abroad.