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  <subheading type="richtext"><![CDATA[&lt;p&gt;&lt;b&gt;Chapter 27&lt;/b&gt;&lt;/p&gt;]]></subheading>
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  <questiontext type="formattedtext" id="1"><![CDATA[A [[toxoid]] is a toxin that has been rendered harmless but still invokes an antigenic response.]]></questiontext>
  <questiontext type="formattedtext" id="2"><![CDATA[Immunity that has been developed through exposure to an antigen or infectious agent is called [[acquired]] immunity.]]></questiontext>
  <questiontext type="formattedtext" id="3"><![CDATA[The marker on cell surfaces that marks the cell as a “self-cell” is an [[antigen]].]]></questiontext>
  <questiontext type="formattedtext" id="4"><![CDATA[An altered or weakened live vaccine made from the disease organism against which the vaccine is protective is an [[attenuated]] vaccine.]]></questiontext>
  <questiontext type="formattedtext" id="5"><![CDATA[A toxoid or attenuated viral component administered to evoke a response from the body that results in immunity is called a [[vaccine]].]]></questiontext>
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