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During the measles outbreak in California in 2015, a large number of suspected cases occurred in recent vaccinees (3). Of the 194 measles virus sequences obtained in the United States in 2015, 73 were identified as vaccine sequences.

https://jcm.asm.org/content/55/3/735

https://jcm.asm.org/content/jcm/55/3/735.full.pdf

Journal of Clinical Microbiology. February 22, 2017.