Equivalently , an estimate of 2 . 8 ( 95 % HPDI 1 . 5 - 4 . 4 ) times the current number of imported cases , could have been detected , if all countries had had the same detection capacity as Singapore , which leads to 1 . 8 ( 95 % CI 0 . 5 - 3 . 4 ) undetected cases per detected case .