Along the ground suddenly, on both sides of the path, he saw dozens of new mushrooms the rain had spawned poking their nodular fingers up through the clammy earth like lifeless stalks of flesh, sprouting in such necrotic profusion everywhere he looked that they seemed to be proliferating right before his eyes.
The girls led them up four steep, very long flights of creaking wooden stairs and guided them through a doorway into their own wonderful and resplendent tenement apartment, which burgeoned miraculously with an infinite and proliferating flow of supple young naked girls and contained the evil and debauched ugly old man who irritated Nately constantly with his caustic laughter and the clucking, proper old woman in the ash-gray woolen sweater who disapproved of everything immoral thatů
There are no more uses of "proliferate" in the book.
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We must not let them proliferate nuclear arms.
Iran was found in direct violation of the non-proliferation treaty.