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.
由于大流行性流感与许多常见传染病具有类似的迹象和症状，医生常常不认为是H1N1感染，也不进行检测。
As pandemic influenza mimics the signs and symptoms of many common infectious diseases, doctors often do not suspect H1N1 infection and do not test.
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