Skin Lesion - Any abnormal tissue on the skin caused by injury or disease.⏎
Transition Zone - The area, sometimes referred to as an ecotone, encompassing the edges of two distinct ecosystems, such as the area where a forest intersects with grassland.⏎
Vector - An organism (usually an arthropod such as a flea, mosquito, or tick) that carries an infectious agent from one host to another.⏎
Virus - An infectious agent that is only capable of replicating itself inside the living cells of other organisms.⏎