These viruses occur naturally among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species. Avian flu viruses do not normally infect humans. However, sporadic human infections with avian flu viruses have occurred.

How does bird flu spread to humans?

The disease is transmitted to humans through contact with infected bird feces, nasal secretions, or secretions from the mouth or eyes. Consuming properly cooked poultry or eggs from infected birds doesn't transmit the bird flu, but eggs should never be served runny.

Can humans suffer from bird flu?

Although avian influenza A viruses usually do not infect people, rare cases of human infection with these viruses have been reported. Infected birds shed avian influenza virus in their saliva, mucous and feces.