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Communicable diseases are community problems, which can devastate whole populations, in both developing and developed countries. Epidemiology is the science of communities that looks at many individuals to try and discover common features in them. From this analysis the cause and characteristics of a disease can be worked out. The first chapters of this book look at communicable disease theory and formulating common principles in both epidemiology and control. Since the first edition, published in 1996, a new section on climate change due to global warming and its effect on disease has been added. Later chapters cover various criteria of communicable diseases including more recent outbreaks that have emerged since the first edition and others which may become important in the future.