Heavy flu keeps the assigned teacher off the day plan; pupils get 48/73 no-teacher marks and a one-shot LessonCancelled notice instead of silent empty rooms.
Node/class contact rolls use pair+day seeds; vanilla respiratory diseases spread, and a threshold raises an info toast instead of per-sneeze noise.
Co-authored-by: Cursor <cursoragent@cursor.com>
Vanilla ships several diseases whose stages drive lesson gain, stay-home
rolls, and illness attendance; cold/rain/snow raise onset via BehaviorDef scale.
Leonid Pershin
