The quote from Jodi Picoult's "Second Glance" suggests that lies have a profound and insidious effect on individuals, much like a contagious illness. It highlights how deceit can permeate one's being, infiltrating even the smallest, most hidden parts of a person. This imagery emphasizes the depth of the impact that lies can have, not just on personal integrity but also on emotional and psychological health.

By comparing lies to an infectious disease, the author underscores the idea that falsehoods can spread and affect others around us. Just as a virus can invade a healthy body, lies can distort relationships and lead to broader consequences. This powerful metaphor reflects the seriousness of dishonesty and its ability to disrupt lives and connections in ways that might not be immediately visible.