The nature of that prophecy is unknown, although speculation is rife that it concerns Harry Potter, the only person ever known to have survived the Killing Curse, and who is also known to have been at the Ministry on the night in question.
There are no more uses of "rife" in the book.
Show samples from other sources
He’s talking to Phoebe Rifer and they’re laughing about something.
Lauren Oliver -- Before I Fall
This, of course, was no manor, but I suppose a house rife with any human activity has something over one unsettlingly spacious and silent.