Why are there deadly viruses?

Genesis 3:19“By the sweat of your brow will you have food to eat until you return to the ground from which you were made. For you were made from dust, and to dust you will return.”

When Adam and Eve disobeyed God, sin entered the world and all of life changed. As a result, there is now sickness, pain, and death. Deadly viruses and pandemics are one of the results of sin that we all experience living in a fallen world.