一直到1854年，出现了大量关于流行病起因及传染方式的推理。
Up until 1854, there had been a great deal of theorizing concerning the causes and modes of transmission of diseases.
研究了两类不同免疫方式下具有饱和传染力的SIR流行病模型的动力学行为。
The dynamic behaviors of a kind of SIR epidemic model with two different vaccination strategies and saturation infectious force are researched.
普林斯顿大学的流行病学家安德鲁•多布森说：“气候变化正在以一种更适合传染病生存的方式扰乱自然生态系统。
"Climate change is disrupting natural ecosystems in a way that is making life better for infectious diseases, "states epidemiologist Andrew Dobson of Princeton University.
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