Dispersed
spreading
you could say 'quickly profused' if its spreading in a bad or harmful way then the word is 'insidious'
The synonym of non malignant is benign.
The word is "proselytizing" but its original meaning had to do with forcing one's religion upon another.
How about four? Babble, gossip, dirty talk, "the word" gossiping, lying, talking smack, backstabbing
Dispersion.
The cast of Spreading the Word - 2005 includes: Nelson Betancourt Mary Cates Andrea Maddox
The transmission finally went out in his old truck. Another sentence would be, the transmission of the virus was spreading fast throughout the community.
A spillover is an instance of overflowing or spreading into another area.
divergent plate boundary
Diffusion
Life in the Word - 1997 Spreading the Gospel Through Partnership was released on: USA: 22 September 2011