Outbreak Investigation

A district health officer receives multiple reports of acute gastroenteritis cases from a specific village. What is the *first* step in initiating an outbreak investigation?

In a school outbreak of food poisoning, 100 students ate a chicken sandwich, and 60 of them developed symptoms. 50 students did not eat the chicken sandwich, and 10 of them developed symptoms. What is the *attack rate* among those who ate the chicken sandwich?

During an outbreak investigation, plotting the number of cases by their date of onset helps to visualize the epidemic's course. This graphical representation is known as a/an:

An epidemic curve showing a sharp rise and a rapid decline, with cases clustered around a single exposure event, is characteristic of which type of epidemic?

The occurrence of cases of an illness, specific health-related behavior, or other health-related events clearly in excess of normal expectancy in a community or region is defined as a/an: