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Health effect. Health effects (or health impacts) are changes in health resulting from exposure to a source. Health effects are an important consideration in many areas, such as hygiene, pollution studies, occupational safety and health, nutrition and health sciences in general.
The health of the U.S. population can be affected by public health threats or events across the globe. Recent examples of this include the 2003 SARS epidemic and the 2009 spread of novel H1N1 influenza. Improving global health can improve health in the United States and support national and global security interests by fostering political stability, diplomacy, and economic growth worldwide.