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Table 5 Interpretation of IgG antidiphtheria toxin values observed in 100 pre-vaccination and 91 post-vaccination sera, as proposed by the EIA manufacturer.

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

Concentration mIU/ml

Vaccination Recommendation

Before vaccination

After vaccination

< 100

Basic immunisation immediately

34

6

[100 – 1000[

Booster vaccination immediately

60

17

[1000 – 1400[

Booster vaccination after 5 years

3

6

[1400 – 2000[

Booster vaccination after 7 years

1

5

≥ 2000

Booster vaccination after 10 years

2

57