Not until the plagues of the Middle Ages did medical doctors learn to apply this principle, which is still deemed effective. ​ — Leviticus, chapters 13 and 14.
ولا يزال مبدأ عزل المرضى معتمدا حتى يومنا هذا .‏ —‏ اللاويين ،‏ الاصحاحان ١٣ و ١٤‏ .‏