某地夏季暴发肠道疾病的流行,调查发现,多数患者发病日期集中在同一潜伏期内,且病例分布与供水范围一致,为了尽快控制疾病的流行,应采取的对策是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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