Authoritarian political ideologies have a vested interest in promoting fear, a sense of the imminence of takeover by aliens and real diseases are useful material.
[M]ilitary metaphors have more and more come to infuse all aspects of the description of the medical situation. Disease is seen as an invasion of alien organisms, to which the body responds by its own military operations, such as the mobilizing of immunological "defenses", and medicine is "aggressive" as in the language of most chemotherapies.
The fact that illness is associated with the poor --who are, from the perspective of the privileged, aliens in one's midst --reinforces the association of illness with the foreign with an exotic, often primitive place.
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