Avian flu typically spreads between wild and domestic birds but can spread to other animals and people. There have now been more than 40 confirmed human cases in the United States, according to the Centre for Disease Control,

The first presumptive human case of avian bird flu has been found in Canada. Here's what you need to know about avian flu.

Health officials in British Columbia have reported the first presumptive case of H5 avian influenza in a human in Canada.