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The plural of "rife" is rife. It is an uncountable noun and does not change in its plural form.
I am rife with answers.
"Rife" is an adjective, not a noun. It means widespread or abounding, such as "The game was rife with errors."
Royal Raymond Rife developed his technology in the 1920's
Rife = Abundant, filled with It was so dark and clear that the sky was rife with stars.