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A free collection of articles about epidemics published in The New York Times.

Epidemiology is the study of factors affecting the health and illness of populations, and serves as the foundation and logic of interventions made in the interest of public health and preventive medicine. It is considered a cornerstone methodology of public health research, and is highly regarded in evidence-based medicine for identifying risk factors for disease and determining optimal treatment approaches to clinical practice.

Every infection is a race between the microbes and the host. The microbe, following the indelible rules of evolution, strives to survive and reproduce, while the host's immune system mounts a warlike defense designed to find, destroy, and eliminate it. An agent that kills its host quickly cannot be expected to survive long enough to reproduce. Thus excessive virulence is not selected for in evolution. Germs, which can reproduce and be passed from one host to another, are favored.

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A disease outbreak is the occurrence of cases of disease in excess of what would normally be expected in a defined community, geographical area or season. An outbreak may occur in a restricted geographical area, or may extend over several countries. It may last for a few days or weeks, or for several years.