contagion
noun
con·ta·gion
kən-ˈtā-jən
1
a
: a contagious disease
b
: the transmission of a disease by direct or indirect contact
c
: a disease-producing agent (such as a virus)
2
3
a
: rapid communication of an influence (such as a doctrine or emotional state)
b
: an influence that spreads rapidly
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Merriam-Webster unabridged
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