After dengue fever outbreaks in Europe put travellers on red alert in spring, cases of another potentially deadly, mosquito-borne virus have now been reported.
West Nile virus has been detected in two individuals in Spain and Italy. According to the European Centre for Disease Prevention and Control (ECDC), the infections were acquired locally rather than on trips to tropical regions.
The case in Italy was discovered on 20 June in Modena, a city in the northern Emilia-Romagna region. It follows a case identified in Seville, Spain, in March.
West Nile virus (WNV) can cause a fatal neurological disease in humans. It belongs to the Japanese encephalitis group of viruses, along with others like dengue and yellow fever.
Birds are the natural hosts of WNV, but it is typically spread by mosquitoes and, in a small number of cases, through blood transfusion, organ donations or pregnancy.
In around four out of five patients, WNV presents no symptoms, but in the other 20 per cent, it develops into West Nile fever. Symptoms include sudden high fever, headache, neck stiffness and a rash on the neck, arms, or legs - and in more severe cases, seizures, muscle weakness and paralysis, according to ECDC.
People over the age of 50 - especially if they have underlying health conditions - are more likely to get seriously ill. Less than 1 per cent of people go on to develop neurological infections such as meningitis or encephalitis - with one in 10 of these cases being fatal.
Symptoms typically appear two to six days after infection but can take up to 14 days or more to develop. In uncomplicated cases, these usually ease within three to six days.
No vaccine against WNV is yet available for humans, so the best way to protect yourself is to prevent mosquito bites.
You can do this by not travelling to affected areas at times when mosquitoes are more common, such as in summer, and reducing your time outdoors when in an affected area.
The virus was first detected in the West Nile district of Uganda in 1937, but can now be found in countries across the world, including in Africa, the Middle East, west and central Asia, North America - and southern and eastern Europe.
Using mosquito repellant, covering your arms, legs and feet, and keeping mosquitoes out of your bedroom at night can also help prevent infection.
If you feel unwell - especially if you have a fever - you should contact your doctor and tell them where you have recently travelled to.
Record-high temperatures and other extreme weather events driven by climate change are causing an uptick in virus outbreaks in Europe.
“Europe is already seeing how climate change is creating more favourable conditions for invasive mosquitoes to spread into previously unaffected areas and infect more
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