After an infective bite, there's an incubation period,

被传染源咬伤后会有一段潜伏期
usually of one to six days,

潜伏期一般是一至六周
and then the classic symptoms appear-- the first beginning--

然后会出现一些典型症状最初
launching the first stage of bubonic plague.

进入到腺鼠疫的第一阶段
That is, at the site of the flea bite,

即被跳蚤咬后
there's what's called a carbuncle or gangrenous black blister,

会出现痈或坏疽的黑疱
surrounded by red pot marks.

周围环绕着红斑
And this will be familiar to you

你们会很熟悉这一症状
because it's been immortalized in the nursery rhyme,

因为它已经被编入童谣永久流传
this is the "The Ring a Ring o'roses."

"玫瑰玫瑰绕圈圈"
but also, mark along with it, there's high temperature and shivering,

其它症状伴随出现高烧发抖
violent headache, nausea and vomiting,

剧烈的头痛恶心呕吐