human
I've heard there are new types of viruses circulating in the wild. Should I be worried?
assistant
It depends on your definition of "new" and how you define "viruses". There have been a number of different virus families discovered over the past few decades, but they're all based on similar principles and share some common features. The most important thing to remember is that these viruses don't really change much from year to year or even decade to decade; what's more likely is that we discover new ways to classify them.