Primary and index cases

@article{Giesecke2014PrimaryAI,
  title={Primary and index cases},
  author={Johan Giesecke},
  journal={The Lancet},
  year={2014},
  volume={384}
}

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References

A Dictionary of Epidemiology

The new edition of this classic text remains the definitive dictionary in epidemiology, and the dictionary goes beyond simple definitions, as it place each term firmly and clearly in its fuller epidemiologic context.