[Robert A Cook PE]

True, true.

How many of these WORK CLOSELY WITH (unminimized) illegal aliens, EMPLOY (unminimized) illegal aliens, ARE THEMSELVES (unminimized) illegal aliens, or RECEIVED FOOD or other unsterilized material FROM (unminimized) illegal aliens?

[neverdem]

The strain is the one that caused an epidemic of about 56,000 cases in the United Kingdom last year.

The population of the United Kingdom was 59,834,300 in July 2004 according to the estimate in Wikipedia, which yields a population incidence of a little under 1 in a 1,000.

According to the CDC, Approximately 3,000 cases were reported annually in 1983–1985 (1.3–1.55 cases per 100,000 population, aka incidence) in the U.S. Since 1989, the number of reported mumps cases has steadily declined, from 5,712 cases to a total of 258 cases in 2004 in the whole U.S. versus the current 245 just in Iowa. (Both of those links are from the same pdf link.)

Let me make a wild @ss guess; it's mutated, and the current MMR vaccine doesn't cover it.