More than 17,000 ducks will be culled in Spain after a highly contagious bird flu strain that has affected poultry throughout Europe was detected at a farm. Authorities said this in Barcelona today. <br/>'<br/>'<br/>The virus found in Catalonia is H5N8, said Meritxell Serret, in charge of agriculture in the northeastern region- the same one that has seen hundreds of thousands of ducks and geese slaughtered in France's southwest. Up until now, the virus had only been detected in Spain in three wild animals.'<br/><br/>'<br/>The H5N8 strain can spread quickly in affected farms, often leading to the culling of thousands of birds. Joan Guix, in charge of public health in Catalonia, sought to ease fears, saying it was a virus that does not spread to humans.<br/>'<br/>'<br/>According to the World Organisation for Animal Health, 24 countries in Europe have detected the H5N8 virus this year, as have China, Egypt, Cameroon and India.