United States Department of Veterans Affairs
Public Health

Environmental Epidemiology Service: Frequently Asked Questions

What is epidemiology?

soldier wearing a gas mask 

Epidemiology is the study of health in populations. As a scientific discipline it serves both the public and medicine through “the study of the occurrence and distribution of health-related states or events in specified populations, including the study of the determinants influencing such states, and the application of this knowledge to control the health problems.”*

Researchers at the Environmental Epidemiology Service study the health of Veterans, either at one point in time or over a period of time. Usually our studies focus on the Veterans of a single conflict period and make comparisons among those who have had different experiences. Learn about our research studies.


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How can I get involved in a research study?

We do not accept volunteers in our research studies. Since it is not possible for us to study all Veterans, we choose a sample from a population to join our research studies. Participants are randomly selected so that each participant can serve as a representative for other similar people that we can not include in a study.

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I am a Veteran. Where can I go to get help from VA?

VA provides a wide variety of health care services and non-health care benefits.

For health care services

For non-health care benefits, including disability benefits

Telecommunications Device for the Deaf: 1-800-829-4833

Veterans Crisis Line: 1-800-273-TALK (8255), Press 1

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What is morbidity?

Morbidity is “any departure, subjective or objective, from a state of physiological or psychological well-being.” Any illness or sickness can be considered a morbid condition; morbidity is a measure of illness.*

*Porta M: A Dictionary of Epidemiology, ed 5. New York, Oxford University Press, 2008.

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Environmental Epidemiology Service