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Table 2 Number of seroconversions and seroconversion rate against 1940s era A/H1N1 strains, A/H1N1 vaccine strains, and A/H1N1pdm09 subtype

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

 

A/Weiss/43

A/FM/1/47

A/H1N1

A/H1N1pdm09

Vaccinated cohorts (strain included in seasonal vaccine)

SCna

SCRb

SCn

SCR

SCn

SCR

SCn

SCR

Whole period analysed (N = 174)

28

16.1

23

13.2

59

33.9

55

31.6

2006–2007 (A/New Caledonia/20/99) (n1 = 45)

11

24.4

5

11.1

19

42.2

6

13.3

2008–2009 (A/Brisbane/59/2007) (n2 = 43)

6

14.0

2

4.7

26

60.5

6

14

2009–2010 (A/Brisbane/59/2007) (n3 = 43)

7

16.4

3

7.0

7

16.3

9

20.9

2010–2011 (A/California/07/2009) (n4 = 43)

4

9.3

13

30.2

7

16.3

34

79.1

  1. aNumber of seroconversions
  2. bSeroconversion rate