How do pandemics in general wreak havoc on our mental health?

Anytime there's any sort of health scare that we don't know much about, stress levels will go up and that's a normal reaction. In the past, we've heard about things like H1N1 (aka Influenza A or Swine Flu) but it was flu-related and flu is a word people are familiar with. The term Coronavirus is new to most people. They're asking themselves, does my medical professional know what this is? Do they know how to treat it? It's natural to feel some fear and anxiety around things that are unknown, but it's our response to those feelings that can be most detrimental to our mental health.