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LOS ANGELES, CA - AUGUST 26:  Incoming kindergartener Jeremy Conner, 5, reacts to a Measles, Mumps and Rubella vaccination (MMR) as his father Mark Conner tries to comfort him August 26, 2002 in Santa Ana, California. Nurses are immunizing children in preparation for the first day of public school.  (Photo by David McNew/Getty Images) David McNew/Getty, David McNew