Among men who have any sound and sterling qualities, there is nothing so contagious as pure openness of heart.
John laughed so heartily at the mere recollection, that he communicated the contagion to both his hearers, and all three burst into peals of laughter, which were renewed again and again, until they could laugh no longer.
There are no more uses of "contagion" in the book.
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Following the French Revolution, a contagion of upheaval spread across Europe.
One of the tragedies for AIDS patients is the irrational fear of contagion through casual contact.