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The Australian Immunisation Handbook 10th Edition 2013

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hydroxide; traces of formaldehyde, neomycin, trometamol and<br />

polysorbate 20. May contain yeast proteins.<br />

• Twinrix (720/20) – GlaxoSmithKline (formaldehyde-inactivated<br />

hepatitis A virus [HM175 strain] and recombinant hepatitis B vaccine).<br />

Each 1.0 mL monodose vial or pre-filled syringe contains 720 ELISA<br />

units of HAV antigens, 20 µg recombinant DNA hepatitis B surface<br />

antigen protein; 0.45 mg aluminium as aluminium phosphate/<br />

hydroxide; traces of formaldehyde, neomycin, trometamol and<br />

polysorbate 20. May contain yeast proteins.<br />

Hepatitis B vaccines are prepared using recombinant technology. After<br />

purification, the HBsAg protein is adsorbed onto elemental aluminium (as<br />

hydroxide and/or phosphate). Hepatitis B vaccines may contain up to 1% yeast<br />

proteins (but no yeast DNA).<br />

<strong>The</strong> Engerix-B and the H-B-Vax II vaccines are manufactured by different<br />

processes, and the HBsAg content of an ‘equivalent’ dose of these 2 vaccines is<br />

different. Studies of hepatitis B vaccines have been conducted using different<br />

schedules and intervals for different age groups. Acceptable schedules are shown<br />

in Table 4.5.1 and are described below.<br />

<strong>The</strong> standard 3-dose schedule and variations<br />

Neonates, children and young adults aged

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