Unit 10-Diseases and Epidemiology;
Lesson 5- Epidemiology 2024/2025 Exam
All Answers and Illustrations Given
Epidemiology - 🧠ANSWER ✔✔-Epidemiology- the science that studies when and
where diseases occur and how they are transmitted in populations.
-desirable to also know the mode of transmission and geographical distribution
of the disease
-Establishing frequency of a disease in a population and identifying factors
responsible for transmission- an epidemiologist can provide physicians with
information that is important in determining the prognosis and treatment of a
disease.
-Epidemiologists- also evaluate how effectively a disease is being controlled in a
community- by vaccination program for example
-they can provide data to help in evaluating and planning overall health care for
a community.
Page 1 of 14
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, Differentiate between descriptive, analytical, and experimental epidemiology -
🧠ANSWER ✔✔
Descriptive Epidemiology - 🧠ANSWER ✔✔-entails collecting All data that
DESCRIBE the occurrence of the disease under study.
-Relevant info includes info about AFFECTED INDIVIDUALS, and the PLACE, and
PERIOD in which the disease occurs.
-Snow's search for the cause of Cholera outbreak in London- example of
descriptive epidemiology.
-study is retrospective- looking backward after the episode has ended.
-epidemiologist backtracks to the cause and source of the disease
-ex. Search for cause of toxic shock syndrome (example of retrospective study)
-initial phase of an epidemiological study- retrospective studies are more
common than prospective (looking forward) studies
-prospective studies- an epidemiologist chooses a group of people who are free
of a particular disease to study.
-groups subsequent disease experiences are then recorded for a given period
-used to test Salk polio vaccine
Page 2 of 14
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
Lesson 5- Epidemiology 2024/2025 Exam
All Answers and Illustrations Given
Epidemiology - 🧠ANSWER ✔✔-Epidemiology- the science that studies when and
where diseases occur and how they are transmitted in populations.
-desirable to also know the mode of transmission and geographical distribution
of the disease
-Establishing frequency of a disease in a population and identifying factors
responsible for transmission- an epidemiologist can provide physicians with
information that is important in determining the prognosis and treatment of a
disease.
-Epidemiologists- also evaluate how effectively a disease is being controlled in a
community- by vaccination program for example
-they can provide data to help in evaluating and planning overall health care for
a community.
Page 1 of 14
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, Differentiate between descriptive, analytical, and experimental epidemiology -
🧠ANSWER ✔✔
Descriptive Epidemiology - 🧠ANSWER ✔✔-entails collecting All data that
DESCRIBE the occurrence of the disease under study.
-Relevant info includes info about AFFECTED INDIVIDUALS, and the PLACE, and
PERIOD in which the disease occurs.
-Snow's search for the cause of Cholera outbreak in London- example of
descriptive epidemiology.
-study is retrospective- looking backward after the episode has ended.
-epidemiologist backtracks to the cause and source of the disease
-ex. Search for cause of toxic shock syndrome (example of retrospective study)
-initial phase of an epidemiological study- retrospective studies are more
common than prospective (looking forward) studies
-prospective studies- an epidemiologist chooses a group of people who are free
of a particular disease to study.
-groups subsequent disease experiences are then recorded for a given period
-used to test Salk polio vaccine
Page 2 of 14
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
