The global outbreak of bird flu is worsening, with over 100 million poultry dead or culled between October and February, more than triple the number from the previous season. The disease has affected farms in Europe and North America, and is also spreading in South America. The epidemic has led to a surge in egg prices and has raised concerns about the virus adapting to different animal species, including minks in Spain. The World Health Organization has called for vigilance to contain the spread in animals, as the virus poses a risk to humans as well.