At least three people in Romania have died after being infected with the West Nile virus. There is no vaccine or specific antiviral treatment for the virus, which is transmitted by mosquito bites. 

More than 10% of mosquitoes in Romania carry the virus, according to a recent study by Cantacuzino Institute in Bucharest. 

This week, at least seven people in Romania over 50 years old contracted the disease, three of whom died from complications.