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index case

noun
  1. med the first case of a disease, or the primary case referred to in a report
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

index case in Medicine

index case

n.
  1. proband