Investigation of Epidemic

An epidemic is best defined as:

• Constant occurrence of a disease in a region

• Occurrence of disease clearly in excess of normal expectancy

• Worldwide spread of a new disease

• Sudden rise of cases restricted to a small locality

Which of the following is an example of an endemic disease?

• Ebola outbreak in West Africa (2014)

• Malaria in sub-Saharan Africa

• Food poisoning in a marriage feast

• COVID-19 in 2020

Hyperendemic condition means:

• Complete absence of a disease

• Occasional occurrence of disease

• Persistent high level of disease occurrence in a population

• Occurrence of disease in excess of expectation

The first step in the investigation of an epidemic is:

• Formulation of hypothesis

• Verification of diagnosis

• Establishing existence of an epidemic

• Analysis of data

In an epidemic investigation, this tool is primarily used for:

• Showing time trends

• Studying geographical distribution of cases

• Testing statistical significance

• Determining source of infection

This tool helps in determining all except:

• Type of epidemic

• Probable period of exposure

• Virulence of the organism

• Incubation period of disease

This is an epidemic curve of

• Point source epidemic

• Propagated epidemic

• Continuous exposure epidemic

• Common source epidemic

In a case-control study conducted during an epidemic investigation, the measure of association is:

• Relative risk

• Attributable risk

• Odds ratio

• Prevalence ratio

In a village of 500 people, 200 attended a wedding feast. Out of them, 80 developed acute gastroenteritis within 24 hours. Among 300 who did not attend, only 10 cases were reported.

What type of epidemic is most likely?

• Point source epidemic

• Mixed epidemic

• Propagated epidemic

• Endemic occurrence

In a village of 500 people, 200 attended a wedding feast. Out of them, 80 developed acute gastroenteritis within 24 hours. Among 300 who did not attend, only 10 cases were reported.

Calculate the attack rate among attendees.

• 20%

• 40%

• 60%

• 75%