In the mid 1300's, Europe and Asia suffered from the Black Plague - some 25 million died because of it.  Listen to what Martin Luther said on the Black Death: “I shall ask God mercifully to protect us. Then I shall fumigate, help purify the air, administer medicine and take it. I shall avoid places and persons where my presence is not needed in order not to become contaminated and thus perchance inflict and pollute others and so cause their death as a result of my negligence. If God should wish to take me, He will surely find me, and I have done what He has expected of me, and so I am not responsible for either my own death or the death of others. If my neighbor needs me however, I shall not avoid place or person. I shall go freely as stated above. See this is such a God-fearing faith because it is neither brash nor foolhardy and does not tempt God.”

(Luther’s Works; Vol. 43, pg. 132).