- Number of deaths/number of case-patients
- Twenty-one days is the maximum time for the incubation period. If no
symptoms developed within 21 days, the disease would not spread. Also,
prompt treatment appeared to decrease mortality.
- 6 weeks, 1.5 months
- Women in the culture are the primary caregivers; therefore
more likely to be exposed to the virus. Women prepare the dead for
burial; therefore, more likely to be exposed to the virus.
- Movement of infected contacts of Ebola Hemorrhagic Fever patients.
- Nested case-control
- The cases and controls are selected from two ongoing cohort studies.
This case-control study is "nested" within these two cohort
studies. Cases are selected based on available data, and healthy
controls are picked at random.
- Data may already exist. Response rate may be higher because these
persons are involved with ongoing studies.
- Would need fewer persons than a case-control study.
- odds ratio
- Relative risk
- RR=(a/a + b)/(c/c + d)
- A, G
- Endemic is the occurrence of the expected number of cases of a
particular type of disease, chronic condition, or injury in a given
area, or among a specific group of people, over a particular period of
- Pandemic is the occurrence of more than the expected number of cases
of a particular disease, chronic condition, or injury occurring over a
very wide area (several countries or continents).
- Epidemic is the occurrence of more than the expected number of cases
of a particular disease, chronic condition, or injury occurring in a
locality (city, state, country).