Deadly Fever Strikes Spanish Holiday Hotspot Salamanca

Inside the 40% Fatality Rate of CCHF

Crimean-Congo haemorrhagic fever is not a trivial illness.

It is a viral infection that causes severe haemorrhagic fever in humans, with a case fatality rate that can reach as high as 40 per cent according to the World Health Organization.

The disease is asymptomatic in many animals but acts with ruthless efficiency in humans, triggering a rapid onset of symptoms that can escalate from flu-like discomfort to life-threatening internal bleeding within days.

The incubation period varies depending on the method of transmission.

If infection occurs via a tick bite, the incubation period is typically one to three days, with a maximum of nine days.

However, if contact with infected blood or tissues is the route, the incubation period can be longer, usually around five to six days, extending up to 13 days.

The sudden onset of symptoms is often the first sign that something is gravely wrong.

Patients initially present with fever, myalgia, dizziness, neck pain and stiffness, backache, headache, sore eyes and photophobia (sensitivity to light).

There may also be nausea, vomiting, diarrhoea, abdominal pain and sore throat early on, followed by sharp mood swings and confusion.

As the illness progresses, usually after a few days, the clinical picture darkens significantly.

Agitation turns into sleepiness, lethargy, and eventually depression.

Severe abdominal pain marks the transition to the haemorrhagic phase of the disease.

This is when the body's vascular system begins to fail.

• Symptoms progress rapidly from flu-like to severe bleeding.
• The haemorrhagic phase involves facial flushing and petechiae.
• Liver enzymes typically show marked elevation during infection.

Doctors report that patients often develop a petechial rash, which are small red or purple spots caused by bleeding into the skin, usually on the trunk and limbs.

Other forms of bleeding can occur, including nosebleeds, gum bleeding, and vomiting blood.

In severe cases, there is bleeding into the bowels, leading to melena or black, tarry stools.

The liver and kidneys are frequently affected, with liver enzymes showing marked elevation and kidney function deteriorating as the virus takes hold.

Recovery generally begins in the second week of illness for those who survive, but the period of convalescence is prolonged and can be physically debilitating.

The high mortality rate is often driven by multi-organ failure and the difficulty of managing severe haemorrhage in a clinical setting.

There is currently no specific vaccine available for human use, though research has been ongoing for decades.

Treatment relies primarily on supportive care, focusing on maintaining fluid and electrolyte balance, correcting haemodynamic parameters, and managing pain.

The antiviral drug ribavirin has been used to treat CCHF, both in oral and intravenous forms, and some studies suggest it can reduce mortality if administered early in the course of the disease.

However, its efficacy remains a subject of debate among infectious disease specialists, and it is not universally licensed for this specific indication.

The severity of the virus is what drives the caution from health officials, even when the number of cases is low.

Hyalomma Ticks: The Aggressive Hunters of Spain

The primary vector for this dangerous virus is the Hyalomma tick, a creature distinct from the more common ticks found in the United Kingdom.

Unlike the Ixodes ricinus, or sheep tick, which British walkers might be familiar with, the Hyalomma is an aggressive hunter.

It does not wait passively on tall grass for a host to brush past.

Instead, it actively tracks its prey by sensing carbon dioxide, body heat, and other chemical signals in the environment.

This behaviour makes them particularly effective at finding hosts, including large animals like cattle, goats, and hares, which serve as reservoirs for the virus.

The Hyalomma tick is widely distributed across North Africa, Asia, and Southern Europe, and its presence in Spain is well-documented.

Officials said the species thrives in the warmer, drier climates of the Iberian Peninsula, particularly in the central and southern regions.

Climate change models suggest that suitable habitats for these ticks are expanding northward, potentially increasing the range of the diseases they carry.

The ticks can carry the virus transstadially, meaning they remain infected through their life stages from larva to nymph to adult.

They can also transmit it transovarially, passing the virus to their offspring.

This biological efficiency makes the Hyalomma a formidable reservoir for CCHF.

• Hyalomma ticks actively hunt rather than waiting in grass.
• The ticks are common in the warmer, drier regions of Spain.
• Climate change is expanding their potential habitat northward.

The risk to humans arises primarily through tick bites, often unnoticed due to the small size of the nymphs.

However, transmission can also occur through contact with infected animal blood or tissues during and immediately after the slaughter of livestock.

Farmers, veterinarians, and slaughterhouse workers are traditionally considered the highest-risk occupational groups.

For British tourists, the risk is most likely to present itself during rural activities such as hiking, camping, or birdwatching in areas where these ticks are prevalent.

The ECDC notes that while Hyalomma ticks are common in the region, the prevalence of the virus within the tick population remains relatively low.

This means that a tick bite does not automatically equate to CCHF infection, but the potential consequences are severe enough to warrant preventative measures.

The ticks are most active during the warmer months, which coincides with the peak tourist season.

This seasonal overlap is a key factor in the timing of the travel warnings.

Understanding the behaviour of this specific tick is crucial for prevention.

Because they hunt, they may be found on the ground or low vegetation, ready to latch onto passing shoes or ankles.

They are also known for their ability to survive long periods without a blood meal, making them resilient in varying environmental conditions.

Why UK Travellers Face Low but Real Risks

For the millions of Britons who travel to Spain every year, the immediate reaction to news of a deadly virus might be alarm.

However, health officials and travel experts are keen to contextualise the risk.

The probability of a tourist contracting CCHF in Salamanca or elsewhere in Spain is currently described as very low.

The disease is not airborne, nor is it spread through casual contact like shaking hands or sharing a meal.

It requires specific interaction with the tick vector or infected bodily fluids.

Most British visitors to Spain stay in urban environments, resorts, or coastal areas where the likelihood of encountering the Hyalomma tick is minimal compared to rural agricultural zones.

Salamanca, while a historic city, is surrounded by the dehesas, the extensive oak woodlands and pastures of western Spain, which are prime habitats for the ticks and the wild animals they feed on.

• The risk of infection is considered very low for the average tourist.
• Transmission requires contact with ticks or infected blood.
• Urban areas pose significantly less risk than rural zones.

Experts pointed out that the two cases diagnosed since June likely involved exposure in rural settings where tick density is highest.

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