The walls (skin) of Hogwarts are strong and made of stone.
The doors and windows are protected with defensive spells (tears & mucus)--even if opened, entrance is difficult.
Professors (macrophages) roam the halls, looking for Death Eaters (virus/bacteria)
But if Death Eaters get by, their disguises taking them further into the school, Dumbledore is informed.
The aurors ( Killer T-cells), contacted by Dumbledore, follow the attack the Death Eaters with the guidance of DA.
As aurors attack Death Eaters, the Order of the Phoenix (suppressor T-cells) arrives to keep the aurors in check... Finally, the Death Eaters are all dead. Dumbledore ensures that students (memory cells) will recognize them in the future.
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