Epidemic - An often sudden increase in the level of disease in a specific population over a given period of time.⏎
Exoskeleton - An external skeleton that protects and supports an organism, in contrast to an internal endoskeleton.⏎
Contagion - A general term for any disease-causing infectious agent spread by direct or indirect contact.⏎
DNA - Short for deoxyribonucleic acid, DNA is any of the nucleic acids that contain the genetic instructions necessary for the development and functioning of all living organisms as well as some viruses.⏎