伤寒杆菌菌体裂解释放出的_____是致病的主要因素。伤寒杆菌有三种抗原,分别为____、_____、____。伤寒杆菌与副伤寒杆菌以_____抗原的不同进行鉴别。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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