When she returned, she had the particular facial expression that her eldest daughter, Boo Boo, had once described as meaning one of only two things: that she had just talked with one of her sons on the telephone or that she had just had a report, on the best authority, that the bowels of every single human being in the world were scheduled to move with perfect hygienic regularity for a period of one full week.
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.