http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6334a1.htm#Tab3 http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6334a1.htm#Tab3 here. The magic number you are looking f

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6334a1.htm#Tab3 http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6334a1.htm#Tab3 here. The magic number you are looking for is 95%. http://www.latimes.com/local/california/la-me-measles-spread-20150122-story.html http://www.latimes.com/local/california/la-me-measles-spread... You may be surprised to learn that Disney etc may have thought of the source and method of spreading of this particular outbreak.