2个月以上的婴幼儿及成人接种卡介苗前应做_________。即1:2000旧结核菌素0.1ml皮内注射。____________性反应者可接种卡介苗。____________性反应者表示已获得免疫力。不需接种。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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