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We do include it. This article says:
"In 2003, world-renowned virologist Robert Webster published an article titled "The world is teetering on the edge of a pandemic that could kill a large fraction of the human population" in American Scientist calling for adequate resources to fight what he sees as a major world threat to possibly billions of lives."

Global spread of H5N1 says:
"Perhaps the most extreme maximum has come from renowned virus expert, Robert Webster, who believes H5N1 has the capacity to mutate into a form that could kill a third of the human population" using the source This source says that in 2003 world renowned virologist Robert Webster published The world is teetering on the edge of a pandemic that could kill a large fraction of the human population in American Scientist saying "a third of the human population" could die from H5N1. In ABC News article on March 14, 2006 he is quoted as saying "Society just can't accept the idea that 50 percent of the population could die. And I think we have to face that possibility."