The common cold: Abu Abd Allah (as) [Imam Hussain (as)] - leprosy
Ali b. al-Khalil narrated from 'Abd al-Aziz b. Hassan from Hammad b. 'Isa from Hariz b. 'Abd Allah al-Sijistani from Abu 'Abd Allah, peace be upon him, who said to his childrens teacher: If any of my children are affected with a cold, inform me."t The teacher would inform him, but he said nothing in response. So the teacher said: You instructed me to infom you of this. I have informed you. But you did not answer me with anything.' He replied: "It [the cold] is not from anything but a strain of leprosy in him. When it stirs up, Allah repels it with a cold.'