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Predicted levels of pertussis toxin (PT)-specific IgG levels (IU/mL) after a first adult tetanus, diphtheria, and acellular pertussis booster vaccination in Dutch adults 25–29 years of age using a bi-exponential model. Note, solid bold line represents the median, solid lines represents the 95% predicted interval (95% PI), and dotted line represents a PT-IgG concentration of 20 IU/mL.
