在人口中快速传播的疾病称为流行性传染疾病。
The rapid spread of a disease throughout a population is an epidemic.
流行性传染病，如猪流感、禽流感和SARS，通过与感染者密切接触而传播。
Epidemics such as swine flu, bird flu, and SARS are spread via close contact with others who are infected.
艾滋病的流行是当今全球最大的健康危机，而疫苗是控制流行性传染病最有效的公共卫生手段，世界上有数百万人因此而受益。
The AIDS epidemic is the world's largest health crisis, and control of epidemic infectious disease vaccine is the most effective means of public health in the world, millions of people have benefited.
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