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Table 2 Numbers of immune and susceptible women to diphtheria and tetanus, by age group

From: Levels of diphtheria and tetanus specific IgG of Portuguese adult women, before and after vaccination with adult type Td. Duration of immunity following vaccination

 

Target disease

Age group in years

 

Immunity (ATT IgG concentration)

 

30 – 39

40 – 49

50 – 59

60 – 69

70 – 98

Total

 

Tetanus

      

Immune (≥160 mIU/ml)

 

16

20

22

12

14

84

Susceptible (<160 mIU/ml)

 

1

1

3

1

10

16

 

Diphtheria

      

Immune (≥100 mIU/ml)

 

12

7

16

11

20

66

Susceptible (<100 mIU/ml)

 

5

14

9

2

4

34

 

Total

17

21

25

13

24

*100

  1. * 100 pre-vaccination sera