" Do you want to know the best, most effective transmitter of contagion known to man?

Edgerton asks me with a pinprick of mad light dancing in each iris.

It's love. Love is the absolute killer. Care. The milk of human kindness. People try so hard to save the people they love that they end up catching the contagion themselves. They give comfort, deliver aid, and in doing so they acquire the infection. Then those people are cared for by others and they get infected. On and on it goes. He shrugs. But that's people. People care too much. They love at all costs. And so they pay the ultimate price. "

― Nick Cutter , The Troop