The narrator tells the audience that there are 7.7 billion people on the face of the earth before the outbreak of the plague. That's five times as many people as there are today. The narrator reminds us that each person's contribution to preventing the spread of disease is just as important as everyone else's. He urges everyone to wear masks in public places and not to eat with non-family members. He also tells them that it's a good idea not to share a meal with someone who doesn't have a family member with whom he or she has an infection.