We also find that a combination of loss of smell and taste , fever , persistent cough , fatigue , diarrhoea , abdominal pain and loss of appetite is predictive of COVID - 19 positive test with sensitivity 0 . 54 [ 0 . 44 ; 0 . 63 ] , specificity 0 . 86 [ 0 . 80 ; 0 . 90 ] , ROC - AUC 0 . 77 [ 0 .