An infectious disease shows iceberg phenomenon. That means it has ?
Ans. is 'c' i.e., More subclinical cases Iceberg of disease Disease in a community may be compared with an iceberg. The floating tip of the iceberg represents what the physian sees in the community, i.e. clinical cases (Diagnosed case, symptomatic case or clinically apparent case). The vast submerged poion of the iceberg represents the hidden mass of disease, i.e. latent, inapparent, presymptomatic and undiagnosed cases and carriers in the community. The "waterline" represents the demarcation between apparent and inapparent disease. Epidemiologist is concerned with Hidden poion of iceberg whereas clinician is concerned with tip of iceberg. Screening is done for Hidden poion of iceberg whereas diagnosis is done for tip of iceberg. Iceberg phenomenon of disease is not shown by rabies, tetanus and measles. The clinician concerned only with the tip of iceberg, i.e symptomatic cases that are seen in clinical treatment, this can result in inaccurate view of the nature and causes of a disease results because the minority of the cases are studied (hidden cases :- submerged poion of ice berg is not studied) -3 Clinician's Fallacy. iseases with a great deal of subclinical infection (therefore have iceberg phenomenon) are :- Rubella Polio Japanese encephalitis Influenza Mumps Hepatitis A and B Diphtheria
More case fatality rate
More SAR
More subclinical cases
More complications