Investigation of Disease Outbreak Exam Questions and Correct Answers Latest Update (Already Passed)
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Investigation of Disease Outbreak
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Investigation Of Disease Outbreak
Investigation of Disease Outbreak Exam Questions and Correct Answers Latest Update (Already Passed)
Ebola Video - Answers -WHO though ebola could be handled
-burial process made disease spread
-lack of understanding of how the disease was spread
-distrust of foreigners
Epidemiologic Triangl...
Measures of Disease Outbreaks: types - Answers -Attack rate
-Secondary attack rate
-Case fatality rate
Measures of Disease Outbreaks: Attack Rate - Answers -Incidence rate that is used when the nature of
the disease or condition is such that a population is observed for a short period of time OR disease
among population-at-risk increase greatly over a short period of time.
-Formula: ill (those who became ill from agent)/ill+well (those at risk) X 100 during a time period
-Food poisoning
Measures of Disease Outbreaks: Attack Rate: Example
A flu outbreak occurred in military barracks, that housed 20 soldiers.
Case A diagnosed Oct 1st, and case B on Oct 2nd. After 10 days, 12 additional cases occurred.
Epidemiologists believed that the second group of cases represented a new generation of cases,
following exposure to the primary cases, case A and B. No soldiers were known to be immune.
Calculate the 1) attack rate and 2) secondary attack rate for this flu outbreak - Answers Attack Rate:
ill/ill+well =14/20 X100 = 70%
Who's the secondary attack group? 12
Who's not susceptible: case A and B
, Secondary Attack Rate = # of cases - initial / number of susceptible - initial = 14-2/20-2 X100 = 12/18 X
100 = 66.7%
Measures of Disease Outbreaks: Secondary Attack Rate (%) - Answers -An index of the spread of disease
within a family, household, dwelling unit, dormitory or similar circumscribed group.
-A measure of contagiousness.
-Used to evaluate control measures
-Formula: # of cases in group - initial cases/# of susceptible persons in the group - initial cases
Terms: Index cases - Answers case that first comes to the attention of public health authorities
Terms: Coprimaries - Answers cases related to index case so closely in time that they are considered to
belong to the same generation of cases
Sentinel case or event - environmental health - Answers
Measures of Disease Outbreaks: Attack Rate: Uses - Answers Helpful in the short term thus, attack rate is
often used to describe occurrence of:
-Food borne illness,
-Infectious diseases
-Acute epidemics
Measures of Disease Outbreaks: Case Fatality Rate (CFR) - Answers -The number of deaths caused by a
disease among those who have the disease.
-Examples of diseases with a high CFR are rabies, cholera and, in the 1980s, AIDS. Ebola
-Formula: # of deaths disease "Z" / # of cases disease "Z" X 100
Measures of Disease Outbreaks: Case Fatality Rate (CFR): Example
Sample calculation: Assume that an outbreak of plague occurs in Nepal. Health authorities record 98
cases of the disease, all of whom are untreated. Among these, 60 deaths are reported. - Answers CFR =
(60/98) x 100 = 61.2%
Terms: Endemic - Answers Usual/typical level of disease occurrence in a population.
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