Several years ago the USDA developed an outreach campaign to educate bird owners on how to keep their poultry flocks healthy. Check out their website here for information and materials. It is important to know what symptoms to look for when it comes to infectious diseases, but also know how to prevent it in the first place with good management.
In their campaign materials is a beautiful and informative 2011 Biosecurity for Birds Calendar. You can send for it now along with other materials in several languages.