Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Transplant drugs that block rejection also block the body's germ fighters, so infections come in waves based on time since surgery.
The Castle Guard Recall During Siege
Imagine a castle (the transplanted organ) under siege by invaders (germs). Normally, the lord commands knights (T-cells) to patrol the walls and archers (neutrophils) to guard the gates, while the castle walls (skin and mucous membranes) stay strong. But to stop the castle's own defense force from attacking the new lord (prevent rejection), the king removes most knights from duty and orders the archers to stand down—they work in slow motion and cannot climb to the walls fast enough. In month 1, enemy soldiers (hospital bacteria) already inside the castle gates (surgical wounds and catheters) multiply because the archers are sluggish. In months 2–6, enemy spies hidden in the stone (viruses, fungi, parasites) wake up and spread freely because the knights who hunt them are gone. After month 6, the king keeps the guard force weak because the new lord must be protected, so any new attacker or reawakened spy can ravage undefended rooms. The castle can only survive if the king sends in specialized mercenaries (prophylactic drugs) to hold the line until enough knights can be called back without turning against the new lord.
American Society of Transplantation (AST) Infectious Diseases Guidelines · CDC guidelines on transplant-associated infections · Infectious Diseases Society of America (IDSA) · American Journal of Transplantation consensus statements · reviewed 2026-07-07