How Northern Ireland relaunched contact tracing for covid-19 a month before the rest of the UK

@article{Baraniuk2020HowNI,
  title={How Northern Ireland relaunched contact tracing for covid-19 a month before the rest of the UK},
  author={Chris Baraniuk},
  journal={BMJ},
  year={2020},
  volume={369}
}
Aided by its relatively small size, Northern Ireland is already tracing over 90% of positive cases within 24 hours—but the system has not escaped scrutiny and criticism, writes Chris Baraniuk