Authors:

Generosity could be as contagious as the zombie plague as long as enough people were willing to be carriers.

Jonathan Maberry (2012). “Tales of the Rot & Ruin: Rot & Ruin; Dust & Decay; Dead & Gone, a Rot & Ruin story; Flesh & Bone”, p.629, Simon and Schuster
Generosity could be as contagious as the zombie plague as long as enough people were willing to be carriers.