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CM7.1-11 | Epidemiology Methods — Assignment

Grading Rubric — Epidemiology Methods — Outbreak Investigation Rubric

Criterion	Points	Full-marks descriptor
Case Definition and Epidemic Confirmation (CM7.7 + CM7.1)	4 pts	Exceeds: Case definition uses all three standard components (clinical + place + time) with precise thresholds; epidemic confirmed with explicit observed vs expected comparison and correct classification; alternative hypotheses stated.
Descriptive Epidemiology — Person/Place/Time and Attack Rate (CM7.4 + CM7.7)	4 pts	Exceeds: All three dimensions (person/place/time) described systematically; epidemic curve type correctly identified with explicit justification; attack rate calculated correctly with numerator, denominator, and multiplier shown; interpretation is epidemiologically meaningful.
Analytical Epidemiology — RR Calculation and Confounding (CM7.5 + CM7.8)	4 pts	Exceeds: Attack rates computed for both groups; RR formula stated and calculated correctly (RR = 32/200 ÷ 2/3800 = 0.16 ÷ 0.0005 = 304); interpretation in plain language is accurate; at least two plausible confounders named (socioeconomic status, proximity to source).
Control Measures — Chain of Infection Framework (CM7.2 + CM7.7)	4 pts	Exceeds: Control measure assigned to each of the six chain links with specificity (e.g., 'hyperchlorination of trunk line' at transmission link, not just 'water treatment'); quarantine duration justified with incubation period range (15–60 days → quarantine contacts for 60 days); two appropriate primary prevention measures named.
Communication and Reporting (CM7.7 + CM7.10)	4 pts	Exceeds: DHO summary is ≤150 words, includes all five required elements (cases, deaths, attack rate, source, control measures, trend); four report components listed in correct order; IDSP reporting timeline correct (within 24 hours for suspected outbreak; IDSP coordinator is immediate authority).