An Explanation of How Avian Flu Spreads

[unable to retrieve full-text content]Contagion depends on a complex interplay between a virus and its victim, including where it enters the body, the types of cells in which it can reproduce and whether it can then escape.

Source: http://feeds.nytimes.com/click.phdo?i=0bee9f0ecf54bfd2b060735279e22f78

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