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The Australian Immunisation Handbook 10th Edition 2013

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DT<br />

a vaccine that protects against diphtheria and tetanus. <strong>The</strong> acronym DT,<br />

using capital letters, signifies the child formulation of diphtheria and tetanuscontaining<br />

vaccine, and denotes the substantially larger amounts of diphtheria<br />

toxoid in this formulation than in the adolescent/adult formulation.<br />

dT<br />

reduced antigen content formulation of diphtheria-tetanus vaccine, which<br />

contains substantially lower concentrations of diphtheria toxoid, and<br />

approximately half the tetanus antigen content, than the child formulation<br />

(which is signified by using capital letters DT). This vaccine is most commonly<br />

administered to adolescents/adults.<br />

DTP/DTPa/DTPw<br />

a vaccine that protects against diphtheria, tetanus and pertussis (whooping<br />

cough). <strong>The</strong> DTP used in Australia and many other industrialised countries is<br />

DTPa, which contains an acellular pertussis component made of refined pertussis<br />

extracts instead of inactivated whole pertussis bacteria (DTPw). <strong>The</strong> acronym<br />

DTPa, using capital letters, signifies child formulations of diphtheria, tetanus<br />

and acellular pertussis-containing vaccines, and denotes the substantially larger<br />

amounts of diphtheria toxoid and pertussis antigens in these formulations than<br />

in the adolescent/adult formulations.<br />

dTpa<br />

reduced antigen content formulation of diphtheria-tetanus-acellular pertussis<br />

vaccine, which contains substantially lower concentrations of diphtheria toxoid<br />

and pertussis antigens, and approximately half the tetanus antigen content, than<br />

the child formulations (which are signified by using all capital letters [DTPa]).<br />

This vaccine is most commonly administered to adolescents/adults.<br />

Effectiveness<br />

the extent to which a vaccine produces a benefit in a defined population in<br />

uncontrolled or routine circumstances<br />

Efficacy<br />

the extent to which a vaccine produces a benefit in a defined population in<br />

controlled or ideal circumstances, for example, in a randomised controlled trial<br />

Encephalitis<br />

inflammation of the brain<br />

Encephalopathy<br />

a general term to describe a variety of illnesses that affect the brain, including<br />

encephalitis<br />

Endemic<br />

endemic infections are present all the time in a community<br />

490 <strong>The</strong> <strong>Australian</strong> <strong>Immunisation</strong> <strong>Handbook</strong> <strong>10th</strong> edition

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