Comparison of an Active and Passive Surveillance System of Primary Care Providers for Hepatitis, Measles, Rubella, and Salmonellosis in Vermont

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Abstract
Between June 1, 1980 and May 31, 1981, the Vermont Health Department telephoned a randomly chosen half of the state''s primary care offices for surveillance reports of hepatitis, measles, rubella and salmonellosis. No reports were actively solicited from the other half of the primary-care practices in the state. Active-surveillance units made more reports and more complete reports of diseases and had twice the number of reports per patient seen by the practice than did passive-surveillance units.