In Mormon 6, the Nephites face what they know will be the final destruction of their people at the hands of the Lamanites. Knowing the end is near and that God has commanded that the Nephite records not fall into the hands of the Lamanites, Mormon buries all but a few of the records in the Hill Cumorah. He then describes the attitude of the people as the Lamanite armies approach:
"And it came to pass that my people…did now behold the armies of the Lamanites marching towards them; and with that awful fear of death which fills the breasts of all the wicked, did they await to receive them." (Mormon 6:7)
How different the above would read if the Nephite people were serving the Lord at this time. First of all, they might not be facing death at all but, even if they were, they would know that they would soon be on their way to paradise, so either way they would have no need to fear.
As I am writing this, there is a disease known as the coronavirus that is making its way through the world, causing considerable fear for many people. After all, nobody likes to be sick, and this particular disease is highly contagious. You can be a carrier for up to 14 days without even showing symptoms, and some number of people are dying from it.
However, even as we take certain prescribed precautions to limit the spread of the disease, we should keep in mind that God is ultimately in control of the situation. So, if you believe in God and you are serving God righteously, you have no need to fear.