My dearest Henry, the advantage to you of getting away from the Admiral before your manners are hurt by the contagion of his, before you have contracted any of his foolish opinions, or learned to sit over your dinner as if it were the best blessing of life!
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.