You must have at least 4 complete sentences unless otherwise indicated. 1. List 2 contributions of the microscope to epidemiology. Describe the chain of infection. 2. What types of epidemiologic studies were used by Janet Lane-Claypon? 3. Discuss how infectious and noninfectious diseases relate to communicable and noncommunicable diseases and conditions. 4. Classifications were given of major infectious diseases. List the three modes of transmission and provide examples. 5. Explain the concept of notifiable diseases.