human
I've heard that there is a bird flu. What is the difference between a bird flu and the flu that affects humans?
assistant
The main difference is that bird flus are caused by viruses that infect birds, while influenza (the human flu) is caused by a virus that infects humans. Bird flus can be transmitted from birds to humans, but only very rarely. Influenza can spread from person to person through coughing or sneezing.