The spread of a disease by contact; figuratively, the rapid transmission of an influence, emotion, or crisis.

From Latin contagio, a touching or contact, from contingere, to touch closely, from con, with, plus tangere, to touch.

transmission spread infection proliferation
containment isolation quarantine immunity
"Regulators watched anxiously for financial contagion as the collapse of one lender threatened to spread panic across the sector."

Works literally in GS2 health answers and figuratively in GS3 economy answers on systemic risk. Use it to describe cascading crises, for example, 'ring-fencing weak banks is essential to prevent contagion across the financial system.'

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