Word: clade
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...having the right strains of virus in the vaccine should a human pandemic ever occur. The virus used to make the Sanofi Aventis vaccine came from a Vietnamese patient who was infected with H5N1 in 2004. The viruses from that sample are part of a group that scientists call clade 1. But the viruses that have recently spread so rapidly among birds from Asia to Europe and Africa are part of a new group called clade 2. Preliminary evidence suggests that there?s not a lot of cross-reactivity between the two clades. That means that a person...
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