The United Nations Food and Agriculture Organisation (FAO) has warned that mad cow disease could spread worldwide. The Rome-based organisation said on Friday all countries that had imported cattle or meat and bone meal (MBM) from western Europe - especially Britain - since the 1980s, could be considered at risk. The crisis has spread to most countries in Europe, with Germany and Spain reporting their first cases of BSE last year, and Italy reported its first domestic case last week. The fear for most nations is the unknown factor of whether imports of beef or animal feed from European countries contain the BSE virus.