ABC In the nearly nine months since the first human case of bird flu was detected in the United States, the virus has continued to spread.
The outbreak infected hundreds of herds and millions of birds before it spread to humans. As of Jan. 6, there have been 66 human cases of bird flu reported in 10 states, according to data from the Centers for Disease Control and Prevention (CDC).
Almost all confirmed cases involve direct contact with infected cattle or infected livestock.