US CDC Thursday said the first severe human bird flu samples taken show mutations not seen in samples taken from birds from the infected patient\'s backyard flock. The mutation was said to be in the part of the virus that plays a key role in attaching to host cells, however the CDC says the risk of an outbreak within the general public remains low.

<div class=\"default-font-wrapper\" style=\"line-height: 1;font-size: 12pt; font-family: Verdana, Geneva, sans-serif;\">US CDC Thursday said the first severe human bird flu samples taken show mutations not seen in samples taken from birds from the infected patient\'s backyard flock.  The mutation was said to be in the part of the virus that plays a key role in attaching to host cells, however the CDC says the risk of an outbreak within the general public remains low.</div>