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What did the Spanish flu have in common with H5N1?

User Prossblad
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it was bird flu that is the correct one
User Julien Picalausa
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Scientists who re-created the 1918 Spanish flu say the killer virus was initially a bird flu that learned to infect people. Alarmingly, they find that today's H5N1 bird flu is starting to learn the same tricks.
User Supreet Singh
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