Pigflu_0425_c
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A FAST-CHANGING VIRUS
Since the 1919 flu epidemic killed millions worldwide, the flu virus has changed its DNA many times; another epidemic could occur any time. Major flu outbreaks
Pandemics
Scares
By year and virus type
1919
1957
“Spanish” Asian flu flu H2N2
H1N1
1968
1977
H3N3
H1N1-x
Hong Kong flu
Russian flu
1999
2003
Hong Kong H5N1 and avian flu H7N7 outbreak H9N2
1920 1930 1940 1950 1960 1970 1980 1990 2000 2010
Global death toll Estimated number of people killed by the three major flu outbreaks in the last century. Sources: U.S. Centers for Disease Conrol and Prevention, Science magazine, McClatchy Tribune
1919
50 million
1957
1 million
1968
750,000
CHRONICLE
Since the 1919 flu epidemic killed millions worldwide, the flu virus has changed its DNA many times; another epidemic could occur any time. Major flu outbreaks
Pandemics
Scares
By year and virus type
1919
1957
“Spanish” Asian flu flu H2N2
H1N1
1968
1977
H3N3
H1N1-x
Hong Kong flu
Russian flu
1999
2003
Hong Kong H5N1 and avian flu H7N7 outbreak H9N2
1920 1930 1940 1950 1960 1970 1980 1990 2000 2010
Global death toll Estimated number of people killed by the three major flu outbreaks in the last century. Sources: U.S. Centers for Disease Conrol and Prevention, Science magazine, McClatchy Tribune
1919
50 million
1957
1 million
1968
750,000
CHRONICLE
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