女孩,12岁。发热、鼻塞、流涕,按上感治疗10天发热不退住院。3个月前,其同班多名同学患伤寒住院、住院后血培养伤寒杆菌生长()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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