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NATURAL HISTORY OF DISEASE

  • 24-03-2024

NATURAL HISTORY OF DISEASE

 

Iceberg Phenomenon of Disease


• Iceberg Phenomenon of disease: Disease in a community may be compared to an
iceberg


Floating tip: What physician sees in community (Clinical cases)


– Vast submerged portionQ: Hidden mass of disease (Latent, inapparent, presymptomatic and undiagnosed cases and carriers)


– Li
ne of demarcation (water surface): Is between apparent and inapparent

• ‘Epidemiologist is concerned with Hidden portion of iceberg’ whereas Clinician is concerned with Tip of iceberg


• ‘Screening is done for Hidden portion of Iceberg’ whereas diagnosis is done for tip of
iceberg


• Iceberg phenomenon of disease is not shown by -

– Rabies
– Tetanus
– Measles
– Rubella

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