First case that comes to notice of physician is?: (A) Primary case, (B) Secondary case, (C) Index case, (D) Refer case
Answer is C. ANSWER: (C) Index caseREF: Park 20th ed p. 91Primary case: first case introduced into the population unit being studiedSecondary case : those developing from contact with the primary caseIndex case : the first case that comes to attention of investigator/ physician