TABLE OF CONTENTS CHAPTER Understanding Vaccines 5 CHAPTER 2 Pro Vaccines Prevent Deadly Diseases 9 CHAPTER 3 Pro Vaccines Are Safe and Cost Effective 15 CHAPTER 4 Pro Vaccines Protect the Unvaccinated 21 CHAPTER 5 Con Vaccines Do Not Always Work 27 CHAPTER Б Con Not Everyone Should Be Vaccinated 33 CHAPTER 7 Con Vaccines Can Cause Side Effects 39 Pros and Cons Summary 44 Focus on Vaccines 46 Glossary 47 To Learn More 48 Index 48
CHAPTER 1 UNDERSTANDING VACCINES Vaccines are designed to prevent people from getting sick When germs enter a person's body they multiply and attack healthy cells The body uses three kinds of white blood cells to fight back They are macrophages B lymphocytes and T lymphocytes Macrophages remove germs from the bloodstream When a disease enters the body macrophages swoop in and gobble up germs But dangerous antigens are left behind Many vaccines are administered as shots
