http://www.cdc.gov/flu/avian/gen-info/transmission.htm
Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
While it is unusual for people to get influenza infections directly from animals, sporadic human infections and outbreaks caused by certain avian influenza A viruses and pig influenza viruses have been reported. This fact sheet discusses ways avian influenza viruses may be transmitted to humans.