辨析英语近似词汇：infectious，contagious
infectious，contagious这一对词都是形容词，又都具有“传染性的”、“传染病的”意义，但内涵和使用场合有所不同。
Infectious disease 是“间接传染的病”，指病菌通过空气、食物、水、衣服、容器等物的传染。例：
Tuberculosis is an infectious disease.
肺结核是一种传染病。
It's said that cancer is not infectious.
据说癌症是不会传染的。
Contagious disease 是“直接传染的病”，一般指跟病人直接接触而感染的病。例：
Scarlet fever is a contagious disease.
猩红热是一种传染病。
Measles and aids are highly contagious.
麻疹和艾滋病是很易传染的。
这两个词用作转义时，可以互换使用，它们都表示“感化”、“感染”之意。例如：
The enthusiasm for the pop-singer is contagious.
He stood there like a fool amid the infectious laughter of his friends.
Infectious 的名词是 infection;contagious的名词是contagion.
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