由体虱传播的流行性斑疹伤寒是最严重的一型，为人类史上的一大灾难，与拥挤、肮脏的人们形影相随。
Epidemic typhus spread by the body louse is the most severe. it is one of the great scourges of history associated with crowded filthy conditions.
由体虱传播的流行性斑疹伤寒是最严重的一型，为人类史上的一大灾难，与拥挤、肮脏的人们形影相随。
Epidemic typhus spread by the body louse is the most severe. it is one of the great scourges of history associated with crowded filthy conditions.
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