What is the difference between passive and active disease surveillance?

What is the difference between passive and active disease surveillance?

• A. Passive relies on active searches for cases; active relies on routine reporting by clinicians.
• B. Passive relies on routine reporting by clinicians; active involves actively seeking cases to identify cases.
• C. Passive is used only for infectious diseases; active used only for chronic diseases.
• D. Passive uses diagnostic tests; active uses surveys.

Answer: (B)

The main idea is who does the searching for cases. In passive surveillance, data come in as a routine part of healthcare—clinicians and laboratories report cases to public health authorities. It relies on those providers to voluntarily and consistently submit reports, so it’s typically cheaper and broader but can miss cases that aren’t reported. In active surveillance, public health staff take the initiative to find cases—review records, contact facilities, conduct surveys or screening—to identify cases that might not be reported. This approach is more sensitive and accurate but requires more resources and effort. The other statements miss or invert this relationship. One says passive involves actively searching for cases and active relies on routine reporting, which flips the actual roles. Another implies surveillance type depends on the disease category (infectious vs chronic), which isn’t true—both can use either approach. The last suggests the method of data collection (tests versus surveys) defines the approach, whereas the defining feature is who is doing the searching and reporting.

The main idea is who does the searching for cases. In passive surveillance, data come in as a routine part of healthcare—clinicians and laboratories report cases to public health authorities. It relies on those providers to voluntarily and consistently submit reports, so it’s typically cheaper and broader but can miss cases that aren’t reported. In active surveillance, public health staff take the initiative to find cases—review records, contact facilities, conduct surveys or screening—to identify cases that might not be reported. This approach is more sensitive and accurate but requires more resources and effort.

The other statements miss or invert this relationship. One says passive involves actively searching for cases and active relies on routine reporting, which flips the actual roles. Another implies surveillance type depends on the disease category (infectious vs chronic), which isn’t true—both can use either approach. The last suggests the method of data collection (tests versus surveys) defines the approach, whereas the defining feature is who is doing the searching and reporting.