1. An Introduction to Epidemiology Sorokhan MD, PhD Bukovinian State Medical University Department of infectious diseases and epidemiology

4. Different types of epidemiological studies the pictorial representation of the different types of epidemiological studies

24. Questions and Answers What is epidemiology? Epidemiology is the basic science of public health. What are types of epidemiological studies ? Observational and Experimental.

25. Questions and Answers What is epidemic? An epidemic is the occurrence of more cases of disease than would normally be expected in a specific place or group of people over a given period of time. What is endemic? An endemic is a high background rate of disease.

26. Questions and Answers What is pandemic? A pandemic is very widespread, often global, disease. What is agent? An agent (a bacterium, parasite, or virus) is the entity necessary to cause disease in a susceptible host.

27. Questions and Answers What is infectivity? Infectivity - the capacity to cause infection in a susceptible host. What is pathogenicity? Pathogenicity - the capacity to cause disease in a host.

28. Questions and Answers What is virulence? Virulence - the severity of disease that the agent causes in the host. What is source for the agent? The source for the agent, is often the place where the agent originates, where it lives, grows, and multiplies, but this is not always the case.

29. Questions and Answers What is a portal of exit? A portal of exit is a pathway by which the agent can leave the source. This pathway is usually related to the place where the agent is localized. What is mode of transmission? A mode of transmission means of carrying agent to the host.

30. Questions and Answers What is a portal of entry? A pathway into the host.

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