1918/1919
“Spanish flu”
|
H1N1
|
50 million
|
All segments of avian origin
|
1957–1963
“Asian flu”
|
H2N2
|
2–4 million
|
Five segments of H1N1 + PB1, HA, NA of avian origin
|
1968–1970
“Hong Kong flu”
|
H3N2
|
1–2 million
|
Six segments of H2N2 + PB1, HA of avian origin
|
1977–1979
“Russian flu”
|
H1N1
|
0.7 million
|
Identical with “Spanish flu” virus
|
2009–?
Swine-origin influenza A virus
|
H1N1
|
?
|
Three segments of classis swine North America, two segments avian North America, one segment H3N2, two segments Eurasian swine lineage
|