High proportion of asymptomatic and presymptomatic COVID-19 infections in air passengers to Brunei

J Travel Med. 2020 Aug 20;27(5):taaa066. doi: 10.1093/jtm/taaa066.


We report early findings from COVID-19 cases in Brunei suggesting a remarkably high proportion of asymptomatic (12%) and presymptomatic (30%) cases. This proportion was even higher in imported cases. These have implications for measures to prevent onward local transmission and should prompt reconsideration of current testing protocols and safe de-escalation of social distancing measures.

MeSH terms

  • Air Travel*
  • Asymptomatic Infections / epidemiology*
  • Betacoronavirus
  • Brunei / epidemiology
  • COVID-19
  • Carrier State / virology*
  • Coronavirus Infections / transmission*
  • Humans
  • Pandemics
  • Pneumonia, Viral / transmission*
  • SARS-CoV-2