Martin Luther writing to Johann Hass:

Use medicine; take potions which can help you; fumigate house, yard, and street; shun persons and places wherever your neighbor does not need your presence or has recovered, and act like a man who wants to help put out the burning city. What else is the epidemic but a fire which instead of consuming wood and straw devours life and body? You ought to think this way:

“Very well, by God’s decree the enemy has sent us poison and deadly offal. Therefore 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 infect 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 but will 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.

The whole letter is available online and is worth reading.