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Infectious diseases are sometimes called " contagious " when they are easily transmitted by contact with an ill person or their secretions ( e. g., influenza ).
Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted.
Other types of infectious / transmissible / communicable diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are usually not regarded as " contagious ," and often do not require medical isolation ( sometimes loosely called quarantine ) of victims.
However, this specialized connotation of the word " contagious " and " contagious disease " ( easy transmissibility ) is not always respected in popular use.

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