contagious

infectious, contagious

• 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。

• 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。

形容词 contagious:

1. easily diffused or spread as from one person to another
2. (of disease) capable of being transmitted by infection
   同义词：catching, communicable, contractable, transmissible, transmittable

1. A period of time during which a vehicle, person, or material suspected of carrying a contagious disease is detained at a port of entry under enforced isolation to prevent disease from entering a country.
   检疫期，隔离期当运输工具、人或材料被怀疑带有传染性疾病，被扣留在港口进行强行隔离的一段期限，以防止疾病传入某个国家
2. An acute contagious viral infection characterized by inflammation of the respiratory tract and by fever, chills, muscular pain, and prostration.
   流行性感冒一种急性的有传染性的病毒感染，主要特征是呼吸道感染和发烧、寒战、肌肉疼痛和虚脱
3. Scarlet fever is highly contagious.
   猩红热传染性很强。
4. He has contagious laughter.
   他有着容易感染人的笑声。

con.ta.gious

adj.（形容词）
Of or relating to contagion.
接触传染病的：接触传染病的或与之有关的
Transmissible by direct or indirect contact; communicable:
有传染性的：可通过直接或间接接触而传染的；传染性的：
例句：
a contagious disease.
触染性疾病

Capable of transmitting disease; carrying a disease:
能够传染疾病的；携带病原的：
例句：
stayed at home until he was no longer contagious.
待在家里直到他不再带传染原

Spreading or tending to spread from one to another; infectious:
有感染力的：逐个蔓延的或倾向于逐个蔓延的；有感染力的：
例句：
a contagious smile.
有感染力的笑容

【引伸】
conta.giously
adv.（副词）
conta.giousness
n.（名词）