Methods Field epidemiological investigation was conducted.
方法用现场流行病学的调查方法。
Methods Infective disease transfer model were explored and the main principle and method of field epidemiological investigation were analyzed.
方法阐述传染病的感染和传播的基本模式，分析现场流行病学调查的基本原理和策略。
Methods: Using methods of field epidemiological investigation as well as serological, immunological and molecular-biological diagnosis to determine this outbreak.
方法采用现场流行病学调查的方法并依据血清学、免疫学以及分子生物学实验结果确认。
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