They have strong humanitarian credentials but skipped the opportunity to tell the human side of this story in the depth it deserves.

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That sense of something new, of a different way of looking at the zombie apocalypse, of a more human side to it all, is gone.

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"It's the dark side of human nature, " says Mr. Overton, who has used a wheelchair for 58 years.

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Then, as the new virus replicates it mutates further and, if luck is on its side, some of these mutations allow it to spread from human to human - a new influenza pandemic is born.

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"It was important that we showed this more realistic, more human side of Lara, " Pratchett said.

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