<human>: I've heard that there's an epidemic of bird flu. Should I be concerned?
<bot>: Bird flu is a contagious disease that can spread from birds to humans. It’s caused by a virus that infects the respiratory tract, and it can lead to severe illness or death in some cases. The World Health Organization (WHO) has reported over 860 human infections with bird flu since 2003, but most people who get sick recover without treatment.