Rumors were flying from student to student like highly contagious germs: who was going to try for Hogwarts champion, what the tournament would involve, how the students from Beauxbatons and Durmstrang differed from themselves.
The Hogwarts house-elves had now started edging away from Dobby, as though he were carrying something contagious.
There are no more uses of "contagion" in the book.
Show samples from other sources
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.