Unusual cases which generated “unexpected” sets of results using the algorithm.

Abbreviations: Neg: negative; Pos: positive; Ind: indeterminate; c/ml: copies/ml; 2nd: second sample collected after positive EIA.*Participant co-enrolled in an HIV vaccine trial.缩写说明：Neg为阴性（negative）；Pos为阳性（positive）；Ind为不确定（indeterminate）；c/ml为拷贝/毫升（copies/ml）；2nd指酶联免疫吸附试验（EIA）检测呈阳性后采集的第二份样本。*本研究受试者同时入组HIV疫苗临床试验。