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The Australian Immunisation Handbook 10th Edition 2013

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demonstrated a more rapid decline, with pertussis antibody levels decreasing<br />

to or approaching pre-vaccination levels after 10 years. 40 <strong>The</strong> rate of decline<br />

in clinical protection is unknown, but some protection against clinical disease<br />

is likely to persist for up to 10 years. Recent studies have indicated that dTpa<br />

vaccine is immunogenic in the elderly. 38<br />

Vaccines containing DTPa are available in various combinations with inactivated<br />

poliomyelitis, hepatitis B and Haemophilus influenzae type b vaccines.<br />

Formulations for children aged

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