Objective Analyzing the quality condition and problems of trivalent Oral Polio Vaccine dragee(TOPV)(after implemented National Lot Release,and evaluating the quality of TOPV.

• 目的分析实施国家批签发前后三价口服脊髓灰质炎减毒活疫苗糖丸(TOPV)的质量及存在问题,评价TOPV的质量。