<prompt> The most common cause of Kaposi sarcoma?HHV7HHV8HHV9HHV6  <response>: Human herpesvirus type 8 is believed to be the cause of most cases of Kaposis sarcoma. Roseola Infantum Exanthem Subitumhas more than one cause: the most common is human herpesvirus type 6 and, less frequently, human herpesvirus type 7. Ref:Harrisons Principles of Internal Medicine, 18e, Chapter 119.Introduction to Infectious Diseases. 