What Is the Difference Between an Emerging and a Reemerging

Multiple Choice

What is the difference between an emerging and a reemerging disease?

A) Emerging diseases are of viral origin, and reemerging diseases are bacterial.
B) Emerging diseases are ones for which vaccines exist; reemerging diseases lack vaccines.
C) Emerging diseases are new to humans; reemerging are known but are rapidly increasing in incidence and/or geographic range.
D) Emerging diseases evolve within humans, but reemerging diseases are of zoonotic origin.