Different Levels of Prevention
Infectious Disease Terms
Case concepts
Disease Transmission Terms
Ways of Disease Transmission
100

Preventing a disease or disorder before it happens.

What is primary prevention?

100

It rises from a specific source. 

What is a common-source epidemic?

100

A person in a population who has been identified as having a particular disease, disorder, injury or condition.

What is a case?

100

It contains, spreads, or harbors an infectious organism. 

What is a carrier?

100

Occurs when an agent is transferred or carried by some intermediate item, resulting in disease.

What is indirect transmission?

200

Behavior change in the individual such as quitting smoking, dieting, wearing a mask...

What is active primary prevention?

200

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. 

What is an epidemic?

200

The first disease case brought to the attention of the epidemiologist. 

What is an index case?

200

The habitat (living or nonliving) in or on which an infectious agent lives, grows, and multiplies.

What is a reservoir?

200

The uninterrupted and immediate transfer of an infectious agent from one person to another.

What is direct transmission?

300

It is aimed at the health screening and detection activities used to identify disease. 

What is secondary prevention?

300

Refers to the ongoing, usual or constant presence of a disease in a community or among a group of people. 


What is an endemic?

300

In an epidemic, the first disease case in the population. 

What is a primary case?

300

A nonliving intermediary such as clothing, food, or water that conveys the infectious agent from its reservoir to a susceptible host.



What is a vehicle?

300

It involves an inanimate object that conveys an infectious agent to a host. 

What is a vehicle-borne transmission?

400

Consists of limiting any disability by providing rehabilitation when a disease has already occurred and caused damage. 

What is tertiary prevention?

400

An epidemic that affects or attacks the population of an extensive region, country, or continent. 


What is a pandemic?

400

A person who becomes infected and ill after a disease has been introduced into a population and who is infected as a result of contact with the primary case. 

What is a secondary case?

400

An individual who has been exposed to and harbors a disease-causing organism and who has done so for some time, even though the person may have recovered from the disease.

What is an active carrier?

400

It occurs when an arthropod (flea, lice...) conveys the infectious agent. 

What is vector-borne transmission?

500

Any attempt to restore an afflicted person to a useful, productive lifestyle. 

What is rehabilitation?

500

It occurs when victims of a common-source epidemic have person-to-person contact with others and spread the disease, resulting in a propagated outbreak. 

What is a mixed epidemic?

500

An individual (or a group of individuals) who has all the signs and symptoms of a disease or condition but has not been diagnosed as having the disease or has the cause of the symptoms connected to a suspected pathogen.


What is a suspect case?

500

An individual who harbors a pathogen and who, although in the recovery phase of the course of the disease, is still infectious. 

What is a convalescent carrier?

500

When the pathogen undergoes changes as part of its life cycle while within the host and before being transmitted to the new host. 

What is biological transmission?

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