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A specialization of a concept, sharing all the definitional attributes of the parent concept, with additional defining characteristics. For example, bacterial infectious disease is a subtype of infectious disease. Bacterial septicemia, bacteremia, bacterial peritonitis, etc. are subtypes of bacterial infectious disease (and infectious disease as well). Subtype is sometimes used to refer to the concepts in a hierarchy that are directly related to a parent concept via the 116680003 |is a| relationship. In this usage, it is distinguished from descendants which explicitly includes subtypes of subtypes