India is one of the 15 countries around the globe affected by the bird flu or avian influenza. The United Nations' Food and Agriculture Organisation (FAO) is concerned. There could be a distinct possibility of the lethally infectious H5NI bird flu virus mutating into a more dangerous form. It could spread rapidly among humans. The FAO has called for close monitoring and strong control efforts to stamp out the menace of avian flu before it's too late.