From Newton’s Ark (published in 2012):

Cyrus looked at the offered hand. He didn’t have an irrational germ phobia, or dislike human contact. But if you wanted to rapidly spread infection through a population, you couldn’t do better than encouraging people to shake hands. It just seemed unnecessarily risky, and for what—to show your enemy you weren’t concealing a weapon? That seemed a little anachronistic in the twenty-first century when death tended to be delivered remotely and impersonally.

(page 47 in the paperback edition)