If bitten by an infected flea, a person usually develops a bubonic form of plague, which is characterised by a swelling of the draining lymph node.
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假若人类被受感染的跳蚤叮咬,被叮位置的淋巴结会肿胀起来形成淋巴腺鼠疫,是最常见的鼠疫。另外,败血症型鼠疫是细菌直接经血液中扩散所致;
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