se propager

Elle se serait propagée si elle n'avait pas été détectée.
It would have spread if they didn't catch it.
Il s’est inquiété qu’il puisse s’agir d’une pure intoxication introduite par un certain David Booth (alias Sorcha Faal) qui se serait propagée dans des milieux gouvernementaux dans le monde.
He was concerned that the whole thing might have been a hoax launched by a certain David Booth (alias Sorcha Faal), which then penetrated government circles throughout the world.
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