Dr Mrgaret Chan, the WHO’s chief of (1) influenza, calls the avian flu a (2) signal from nature. In her view, humans are seeing a pandemic (3) in front of their eyes for the first time in history. She gained valuable experience with H5N1 when she was serving as Hong Kong’s (4) of health in1997. What’s concerning Dr Chan is the (5) spreading of the virus as well as the fact that it has extended beyond the (6) sector and started to (7) cats and tigers. To stop the bird flu before it becomes highly (8) in humans, the best minds in health, science and(9) medicine have been mobilized. Also as part of the effort, nearly 200 million chickens exposed to the virus have been (10) .