Is bird flu making a comeback? The U.N.'s Food and Agriculture Organization (FAO) said on August 29 there was evidence that a mutant strain of the H5N1 avian influenza virus was spreading in Asia and beyond, "with unpredictable risks to human health." The CDC says H5N1 poses no threat in the U.S. - at least at this point. Still, Americans are newly curious about bird flu, which according to the FAO has infected 565 people and killed 331 since it first appeared in 2003.

It's an illness caused by avian (bird) influenza viruses. These viruses affect both wild and domesticated birds, including chickens, ducks, and turkeys. The birds shed virus particles in their saliva, nasal secretions, and feces. People who have close contact with infected birds can get sick - and could possibly spread the virus to other people.

Human cases of avian influenza have been reported in more than a dozen countries. In 2011, cases have been reported in Bangladesh, Cambodia, Egypt, and Indonesia, according to the World Health Organization.

Fever, cough, sore throat, and other mild flu-like symptoms are common. But avian influenza can also cause eye infections and severe respiratory problems, including pneumonia. These can be life-threatening.

No. Getting a seasonal flu shot doesn't protect you against avian influenza.

You cannot get bird flu from eating or preparing poultry or eggs. Even if the eggs or poultry were contaminated, proper cooking would kill the virus. To minimize risk, wash your hands with warm, soapy water for at least 20 seconds before and after handling raw poultry or eggs. Clean cutting boards and other utensils to prevent cross-contamination. Cook eggs until whites and yolks are firm, and use a food thermometer to ensure that poultry is cooked to a temperature of at least 165 degrees Fahrenheit.

Yes. In the U.S., there is no evidence of any risk associated with keeping a flock of chickens.