The nurse is teaching family members of a client with hepatitis A virus (HAV). Family members were exposed to the client and, therefore, should receive immunoglobulin. The nurse should tell the family members that immunoglobulin （）.
A．prevents hepatitis infection in all people.
B．provides immunity for life.
C．must be administered within 2 weeks of exposure.
D．should be administered even if the person has anti-HAV antibodies.
参考答案：C
解析：
If immunoglobulin is administered within 2 weeks of exposure it usually prevents HAV. If family members do contract HAV, the course of the disease may be reduced to a subclinical infection after receiving immunoglobulin. Immunoglobulin provides passive immunity for 6 to 8 weeks only--not for life. If a person with anti-HAV antibodies is exposed to HAV, it isn't necessary to administer immunoglobulin.