“Kindness is infectious. Spread the disease.”

“That's the world out there, little green apples and infectious disease.”

“A smile is the only infectious affliction everyone is encouraged to spread.”

“Yawns are not the only infectious things out there besides germs.Giggles can spread from person to person.So can blushing.But maybe the most powerful infectious thing is the act of speaking the truth.”

“In all, 86 per cent of the increased life expectancy was due to decreases in infectious diseases. And the bulk of the decline in infectious disease deaths occurred prior to the age of antibiotics. Less than 4 per cent of the total improvement in life expectancy since 1700s can be credited to twentieth-century advances in medical care.”

“That man penetrated me with his shame. Shame, I realize now, is an infectious disease. Shame can be sexually transmitted.”