Test-negative designs: differences and commonalities with other case-control studies with 'other patient' controls.

@article{Vandenbroucke2019TestnegativeDD,
  title={Test-negative designs: differences and commonalities with other case-control studies with 'other patient' controls.},
  author={Jan P. Vandenbroucke and Neil Pearce},
  journal={Epidemiology},
  year={2019}
}
Test-negative studies recruit cases who attend a healthcare facility and test positive for a particular disease; controls are patients undergoing the same tests for the same reasons at the same healthcare facility and who test negative. The design is often used for vaccine efficacy studies, but not exclusively, and has been posited as a separate type of study design, different from case-control studies because the controls are not sampled from a wider source population. However, the design is a… 

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