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Previous flu pandemics

Previous flu pandemics, as reported by the National Institute of Allergy and Infectious Diseases:

_1918: "Spanish flu" pandemic. H1N1 virus. Killed 20 million to 50 million people worldwide, 500,000 in the United States.

_1957-58: "Asian flu" pandemic. Virus H2N2. Killed 70,000 Americans. No one under 35 has immunity to this strain.

_1968-69: "Hong Kong flu" pandemic. Virus H3N2. Killed 34,000 Americans. This virus is still circulating and kills about 36,000 Americans yearly.

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(c) 2005, Knight Ridder/Tribune Information Services.

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