单选题患儿男，3岁。未接种麻疹疫苗，在托儿所中接触麻疹患儿，立即给予免疫血清球蛋白注射，该小儿应观察（）A5天B7天C14天D21天E28天
单选题
患儿男，3岁。未接种麻疹疫苗，在托儿所中接触麻疹患儿，立即给予免疫血清球蛋白注射，该小儿应观察（）
A
5天
B
7天
C
14天
D
21天
E
28天
参考解析
解析：
接触过麻疹患儿的易感儿应隔离观察21天。
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