Epidemiology: zero reporting in surveillance: practice question

A PSM question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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PSM · Epidemiology: zero reporting in surveillance

Sample item

Under a surveillance programme, a primary health centre sends its weekly report stating that no case of any notifiable condition was seen. Why is such a nil report required?

AIt separates a true absence of cases from a missing reportBIt takes the place of laboratory confirmation of casesCIt qualifies the centre for a performance-linked paymentDIt certifies that the whole community is free of infection

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. It separates a true absence of cases from a missing report

Zero or nil reporting means a reporting unit sends a report even when no cases occurred. Without it, the surveillance unit cannot tell whether silence means no cases or a failure to report. It improves completeness and timeliness of the system.

Option by option

A. It separates a true absence of cases from a missing report (correct)
Correct. A nil report distinguishes true absence of cases from missing data.
B. It takes the place of laboratory confirmation of cases
Confirmation by a laboratory is a separate step and is not replaced by reporting.
C. It qualifies the centre for a performance-linked payment
Reporting is a duty of the system and is not linked to any payment.
D. It certifies that the whole community is free of infection
A single nil report cannot certify that the community is free of infection.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this PSM question

What is the answer to this PSM question?

The best answer is A, It separates a true absence of cases from a missing report. Zero or nil reporting means a reporting unit sends a report even when no cases occurred.

Why is "It takes the place of laboratory confirmation of cases" not the answer?

Confirmation by a laboratory is a separate step and is not replaced by reporting.

Why is "It qualifies the centre for a performance-linked payment" not the answer?

Reporting is a duty of the system and is not linked to any payment.

Why is "It certifies that the whole community is free of infection" not the answer?

A single nil report cannot certify that the community is free of infection.

What concept does this question test?

It tests Epidemiology: zero reporting in surveillance in PSM. Without it, the surveillance unit cannot tell whether silence means no cases or a failure to report. It improves completeness and timeliness of the system.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Epidemiology: zero reporting in surveillance?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.