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Table 4 Similarity values expressed as a percentage of genetic homology (% of similarity/100) between A/H1N1 and A/H1N1pdm09 viruses

From: Antibodies against 1940s era a/H1N1 influenza strains a/Weiss/43 and a/FM/1/47 and heterotypic responses after seasonal vaccination of an elderly Spanish population

Influenza A/H1N1 strains

A/South Carolina/1/18

A/PR/8/34

A/Weiss/43

A/FM/1/1947

A/USSR/90/1977

A/New Caledonia/20/1999

A/Brisbane/59/2007

A/California/07/2009

A/South Carolina/1/18

1.000

A/PR/8/34

0.891

1.000

A/Weiss/43

0.873

0.929

1.000

A/FM/1/1947

0.864

0.912

0.934

1.000

A/USSR/90/1977

0.840

0.891

0.916

0.952

1.000

A/New Caledonia/20/1999

0.796

0.844

0.860

0.886

0.913

1.000

A/Brisbane/59/2007

0.780

0.824

0.841

0.864

0.888

0.967

1.000

A/California/07/2009

0.771

0.711

0.704

0.709

0.679

0.651

0.642

1.000