FA-64974 / Epidemic compartment models / Member archive

SIRS waning-immunity simulation: cumulative incidence · case 04

Cumulative incidence stops growing, and even falls, once reinfections occur.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Daily forward-Euler SIRS; waning flow is R/immunity_days back to S (immunity_days 0 means permanent immunity); cumulative incidence sums every S->I flow including reinfections; return [S, I, R, cumulative incidence] rounded to 3.

Why this case matters

Compartmental epidemic calculations drive outbreak forecasts, vaccine targets and hospital planning; a single wrong flow, rate conversion or boundary silently changes every downstream number.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: permanent immunity sentinel	`[48.675, 7.802, 443.523, 451.325]`	`[48.675, 7.802, 443.523, 446.325]`	Failed

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