Unit 6 Public Health
Public health:1. the outbreak of an epidemic: bird flu/ avian flu, SARS, AIDS,  malaria …2. regional or international effort to contain(控制) a deadly disease 3. health problems(pollution, drug abuse, obesity) and government countermeasures.  
Vocabulary
outbreak 暴发 infection 感染，传染 influenza 流行性感冒 strain 病菌 immunize 使…免疫 vaccinate 接种疫苗 viral 病毒 epidemic 流行病 pandemic 疾病大流行 transmit 传输，传染 mutation 变种，突变  contaminate 污染 cull 挑出(病禽)杀死 demographic 人口统计学 eradicate 根除 hallucination  ...