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Table 4 Interpretation of IgG antitetanus 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 protection

Vaccination recommendation

Before vaccination

After vaccination

<= 30

No

Basic immunization

0

0

]30 – 100]

Not surely guaranteed

Booster vaccination

8

0

]100 – 500]

Existent

Booster vaccination

29

2

]500 – 1000]

Sufficient

Control in 2 years

13

4

]1000 – 5000]

Long term

Control in 5–10 years

41

6

> 5000

Extremely high

Control in 10 years

9

79