Public organizations and agencies were formed to employ newly discovered interventions against health threats. As understanding of sources of contagion and means of controlling disease became more refined, more effective interventions against health threats were developed. ![]() In earlier centuries, when little was known about the causes of disease, society tended to regard illness with a degree of resignation, and few public actions were taken. During the past 150 years, two factors have shaped the modern public health system: first, the growth of scientific knowledge about sources and means of controlling disease second, the growth of public acceptance of disease control as both a possibility and a public responsibility.
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