article_snippet.sent: That number will likely grow as birds with disease fly from one state to the next.
article_snippet.sent: On Monday, health leaders in Iowa said more than 5 million hens would have to be euthanized after bird flu was detected at a commercial laying facility there.
article_snippet.sent: In the United States, some 3.5 million birds had already been euthanized to prevent the spread of disease, according to the USDA.
article_snippet.sent: the CDC the CDC said the CDC is also monitoring at least 100 people who have worked with sick birds.
article_snippet.sent: Birds that are sick die quickly, according to Clifford.
article_snippet.sent: With turkeys, turkeys go off turkeys water and turkeys feed when turkeys are sick and become lethargic or have a condition called "torticollis" or "stargazing" he said, and turkeys die shortly after that.
highlights_snippet.sent: At least 100 people who worked with the sick birds are being monitored for any sign of sickness .
  
highlights_snippet.sent: So far 3.5 million birds have been euthanized .