Public health is the promotion of health for groups of people. These groups range from small communities all the way to large regions of the world.
Professionals in public health:
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Educate and promote healthy behaviors and lifestyles
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Promote prevention
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Conduct research
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Create vaccines, medications, and therapies
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Prevent, track, treat, and control disease spread
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Plan, write, create, and implement policy
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Identify and limit inequalities in health
Sources:
American Public Health Association https://www.apha.org/what-is-public-health
CDC Foundation https://www.cdcfoundation.org/what-public-health