Immunogenicity & Reactogenicity of Boostrix 10 Years After Previous Booster Vaccination.

The purpose of this study is to assess the efficacy and safety of repeating dTpa booster in adults 10 years after previous booster vaccination with dTpa in a prior clinical study. Only subjects who received booster vaccination in the previous clinical study are eligible for participation in this study.

This Protocol Posting has been updated in order to comply with FDA AA, Sep 2007.

Eligibility Criteria:
Inclusion Criteria:

* Subjects who the investigator believes that they can and will comply with the requirements of the protocol should be enrolled in the study.
* Subjects who have received dTpa vaccine or Td and pa vaccines in study 263855/004.
* A male or female subject, recruited 10 years after booster vaccination in study 263855/004.
* Healthy subjects as established by medical history and clinical examination before entering into the study.
* If the subject is female, she must be of non-childbearing potential, or, if of childbearing potential, she must use adequate contraception for 30 days prior to vaccination and continue for 2 months after completion of the vaccination series.
* Written informed consent obtained from the subject.

Exclusion Criteria:

* Use of any investigational or non-registered product other than the study vaccine within 30 days preceding the booster dose of study vaccine, or planned use during the study period.
* Chronic administration of immunosuppressants or other immune-modifying drugs within six months prior to the booster dose.
* Administration of a vaccine not foreseen by the study protocol within 30 days prior to booster vaccination or planned administration during the active study period.
* Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product.
* Previous booster vaccination against tetanus, diphtheria or pertussis since the last dose received in study 263855/004.
* History of documented diphtheria, tetanus, or pertussis diseases.
* Any confirmed or suspected immunosuppressive or immunodeficiency condition, based on medical history and physical examination.
* History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.
* Administration of immunoglobulins and/or any blood products within the three months preceding the booster dose or planned administration during the study period.
* Occurrence of transient thrombocytopenia or neurological complications following an earlier immunisation against diphtheria and/or tetanus.
* Occurrence of any of the following adverse event after a previous administration of a DTP vaccine :

  * hypersensitivity reaction to any component of the vaccine,
  * encephalopathy of unknown aetiology occurring within 7 days following previous vaccination with pertussis-containing vaccine,
  * fever \>= 40°C within 48 hours of vaccination not due to another identifiable cause,
  * collapse or shock-like state (hypotonic-hyporesponsiveness episode) within 48 hours of vaccination,
  * convulsions with or without fever, occurring within 3 days of vaccination.
* Acute disease at the time of enrolment.
* Pregnant or lactating female.
* Female planning to become pregnant or planning to discontinue contraceptive precautions within 2 months after completion of the vaccination series.