Contagion
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Negative Connotation
The term often implies negative influence, especially in social or ideological contexts. The contagion of false information has become a problem for society.
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Metaphorical Use
It's used metaphorically to describe the rapid spread of ideas or behaviors. The contagion of panic during the stock market crash was palpable.
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Figurative Speech
In non-medical contexts, 'contagion' is often figurative, not literal. His laughter was a contagion that filled the entire room.