there are a number of diseases referred to as "measles" in swine. though neither true "measles" nor rubella are able to be contracted by pigs - (which is one of the reasons they should be able to stamp them out in humans) one of the "measles" that pigs get is thought to be ancestral to the virus that causes measles in humans. the most common "measles" in pigs is actually a parasitic infection and is caused by cysts formed by tapeworm larvae