What pathogens cause measles?

Answer 1

It is a virus called rubeola (not to be confused with rubella).

Measles is caused by the measles virus, " a single-stranded, negative-sense enveloped RNA virus of the genus Morbillivirus within the family Paramyxoviridae." Rubella, otherwise known as German measles, is caused by the rubella virus. German measles is less potentially dangerous than "regular" measles, except in pregnant women, where it can cause miscarriage or birth defects.

Some animals and plants suffer from diseases which are also called "Measles" but which are caused by entirely different pathogens (such as parastical worms).
The pathogen that causes Measles is the Measles virus, a type of paramyxovirus. Here's a brief description of it: http://en.wikipedia.org/wiki/Measles_virus

Answer 2

Rueobla