People are less likely to have certain bacterial infections now than they were 100 years ago.Which two practices have been developed more and more over time and have reduced cases of bacterial infection?

Refrigeration slows the growth of many bacteria in food, helping prevent foodborne infections. Regular trash collection also limits the spread of disease-causing bacteria by removing waste where germs can grow. Lichen use and dieting are not general public-health practices that explain the reduced cases.

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