Which practice is the single most important method to break the spread of infection?

a. covering your mouth when coughing

b. using sanitizing in place of soap and water

c. washing hands

d. wearing gloves

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

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