A measure of morbidity often used in infectious disease investigations

A measure of morbidity often used in infectious disease investigations is the attack rate. Attack rates are often specific to an exposure. An example of an attack rate is

1. The number of cases of cancer recorded at a medical center
2. The number of people who died of cholera in India in a given year
3. The number of beef cattle inoculated against mad-cow disease on a farm
4. The proportion of people becoming ill after eating at a fast-food restaurant

ESSAYBID ANSWER

ANS: 4