In 1918,a flu strain killed millions of people,a pandemic that became the basis for hysteria surrounding the outbreak of which related virus in 2009?

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The pandemic that killed millions of people in 1918 was caused by the H1N1 influenza virus. The outbreak of H1N1 in 2009 led to a lot of hysteria because it was a new strain of the virus that people had not been previously exposed to. It was commonly referred to as the "swine flu" because it was believed to have originated in pigs.

In 1918,a Flu Strain Killed Millions of People,a Pandemic That