Wilson and Jungner's criteria for a good screening programme include: 'The condition should have a recognizable latent or early symptomatic stage.' This criterion is important because:

• A Without a detectable preclinical phase, early detection through screening is impossible and does not alter outcomes ✓
• B Screening is only beneficial for communicable diseases with a latent phase
• C The latent stage ensures screening tests have high sensitivity
• D Recognizable early stage reduces lead-time bias in screening studies

Explanation

Wilson and Jungner's criterion about a recognizable latent or early symptomatic stage is fundamental because screening presupposes that identifying disease before symptoms appear allows effective early treatment that improves outcomes. If a disease has no preclinical phase or if early detection does not change disease trajectory or mortality, screening provides no benefit. Cervical cancer (CIN to invasive cancer over years) and colorectal cancer (polyp to carcinoma) exemplify this — their long preclinical phases make screening highly valuable.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.