<prompt> Which one of the following does not represent the submerged portion of the iceberg?Diagnosed cases under treatmentUndiagnosed casesPre-symptomatic casesCarriers sub clinical cases  <response>: Ans. a Diagnosed cases under treatment Iceberg Phenomenon of disease: Disease in a community may be compared to an iceberg- Floating tip is what physician sees in community, i.e., clinical cases- Vast submerged portion of iceberg represents hidden mass of disease i.e., latent, inapparent, pre-symptomatic and undiagnosed cases and carriers in community- Line of demarcation water surface: Is between apparent and inapparent infections- Water surrounding iceberg: Healthy populationALSO REMEMBER 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 