某护士在给一位乙型肝炎病毒(HBV)携带者注射时,不慎被患者用过的针头刺伤手指。为预防乙型肝炎病毒感染,应首先采取的措施是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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