Somewhere, he thought, there was this boy’s mother, who had trembled with protective concern over his groping steps, while teaching him to walk, who had measured his baby formulas with a jeweler’s caution, who had obeyed with a zealot’s fervor the latest words of science on his diet and hygiene, protecting his unhardened body from germs-then had sent him to be turned into a tortured neurotic by the men who taught him that he had no mind and must never attempt to think.
There are no more uses of "hygiene" in the book.
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Many illnesses, especially diarrhea, can be prevented by good hygiene.
The company inspects hygiene at food-processing plants.