By the timing of the spread and the pattern of outbreaks within a country and between countries, it does not make sense relative to a role for migratory birds as a means of spreading the virus.

Hon Ip

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That highlights the need for a surveillance program such as we're starting in North America.

We haven't bet the farm on just Alaska. We have people all over the place. We are training wildlife biologists, rangers and, in some places, the public health officers as to what to look for.

We should check the large amount of air traffic and air cargo between the United States and Asia through Alaska. We should investigate each outbreak like a crime scene.

We also worry that birds will stop off in some of the U.S. territories in the Pacific like Guam, and Hawaii.

There are tools we can use. It is not true that nothing can be done once H5N1 is back into wild birds.