A rapid Covid-19 test returning results within 30 minutes and currently on trial at Hong Kong International Airport could miss some infections with very low viral levels, one of its developers has admitted.The University of Oxford designers of the test say it can correctly identify more than 90 per cent of positive cases but medical experts warn more trial data is needed to determine its sensitivity rate.Called the Oxsed RaViD Direct, the screening method draws on established analysis…



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