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Public health and Prevention

I am examining the change in emphasis from treatment to prevention in the US health care system during the last 25 years. I am confused about where public health measures and prevention intersect? In many ways arent the one in the same? If someone could help me to understand the differences (if there are difference) and how prevention with respect to healthcare evolved it would be really helpful. Also, what the secondary and tertiary prevention? are drugs in some cases considered preventitive medicine? I have read conflicting reports.
could OTA 103280 not repsond. thanks

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