Sporadic - Definition

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A sporadic condition is one that manifests on an isolated occasion in one person, as opposed to the words epidemic, endemic, or pandemic, which are used to describe a condition affecting an entire population. Cases are therefore usually described as sporadic when it is an infectious disease, for example, that only one person has contracted, despite how potentially contagious the diseases is. The term sporadic is also used in genetics following diagnosis of a genetic disease and the study of affected individual's family when no other family member is found to be affected.