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Japanese encephalitis (JE) virus is the leading cause of vaccine-preventable encephalitis in Asia and the Western Pacific, which mainly invades central nervous system. Vaccination is the most important strategy to prevent JE. Currently, both live attenuated Japanese encephalitis vaccines (JE-L) and inactivated vaccines (JE-I) are in use. Due to the supply of vaccines and the personal choice of recipients, there will be a demand for interchangeable immunization of these two vaccines. However, relevant research is limited. By reviewing domestic and foreign research evidence, this article summarizes the current situation of the interchangeable use of JE-L and JE-I, and makes recommendations when the interchangeable immunization is in urgent need, so as to provide reference for practical vaccination and policymaking in China.流行性乙型脑炎（乙脑）是由乙型脑炎病毒（JEV）引起的以侵犯中枢神经系统为主的疾病，是亚洲和西太区引起儿童病毒性脑炎的主要病因。接种疫苗是预防乙脑的主要措施，当前我国有乙脑减毒活疫苗和乙脑灭活疫苗在使用。由于疫苗供应、受种者主客观选择等原因，会面临这两种疫苗序贯接种的需求，但当前缺乏相关实施依据。本文收集国内外研究证据，梳理了当前乙脑疫苗使用现状及序贯接种的研究进展，阐述了在无法满足同一类型乙脑疫苗完成全程接种情况下的序贯接种建议，以期为乙脑疫苗接种工作的开展和相关政策的制定提供参考。.

To study the parental origin and cell stage of nondisjunction in sex chromosome aneuploidies. Retrospectiving and analyzing the results of 385 cases of SCA confirmed by QF-PCR and karyotype analysis in the prenatal diagnosis center of Guangzhou Women and Children Medical Center from January 2015 to December 2020. The types of samples and prenatal diagnosis indications were analyzed. The parental origin and cell stage of nondisjunction in sex chromosome aneuploidies analyzed by comparing the short tandem repeat (STR) peak patterns of samples from fetuses and maternal peripheral blood. The results show that (1) There were 324 cases of nonmosaic SCA, 113 cases (113/324, 34.9%) were 45, XO, 118 cases (118/324, 36.4%) were 47, XXY, 48 cases (48/324, 14.8%) were 47, XXX and 45 cases (45/324, 13.9%) were 47, XYY. 68 (45/324, 60.2%) cases of 45, X were detected in villus samples. The other SCA cases were mainly detected in amniotic fluid samples. There were 61 mosaic SCA samples, 58(58/61, 95.1%) of mosaic SCA samples were mosaic 45, X. (2) The top two indications of 45, X cases are increased nuchal translucency(53/113, 46.9%) and fetal cystic hygroma (41/113, 36.3%), while the most common indication of other types of SCA was high risk of NIPT(170/272, 62.5%). (3) Among 45, X cases, there were 88 cases (88/113, 77.9%) inherit their single X chromosome from their mother and 25 cases (25/119, 22.1%) from their father. In 47, XXY samples, 47 cases (47/118, 39.8%) of chromosome nondisjunction occurred in meiosis stage Ⅰ of oocytes, 51 cases (51/118, 43.2%) occurred in meiosis stage Ⅰ of spermatocytes, and 20 cases (20/118, 16.9%) occurred in meiosis stage Ⅱ of oocytes. Among 47, XXX samples, 29 cases (29/48, 60.4%) of X chromosome nondisjunction occurred in meiosis stage Ⅰof oocytes, 15 cases (15/48, 31.3%) occurred in meiosis stage Ⅱ of oocytes, and 4 cases (4/48, 8.3%) occurred in meiosis stage Ⅱ of spermatocytes. In summary为分析荧光定量聚合酶链反应（QF-PCR）检测胎儿性染色体非整倍体（SCA）的结果及性染色体不分离发生的亲源性及发生时期。采用回顾性研究，收集2015年1月至2020年12月在广州市妇女儿童医疗中心产前诊断中心同时经QF-PCR检测及染色体核型分析确定为SCA的 385例样本的临床资料。统计SCA样本类型及产前诊断指征，通过对比产前诊断样本与孕妇样本的短串联重复序列（STR）分析非嵌合型性染色体非整倍体的染色体不分离发生的亲源性和发生时期。结果显示，（1）非嵌合型SCA样本324例，其中45，XO 113例（113/324，34.9%），47，XXY 118例（118/324，36.4%），47，XXX 48例（48/324，14.8%），47，XYY 45例（45/324，13.9%）。45，XO病例在绒毛样本中检出68例（68/113，60.2%），其他SCA样本在羊水样本中检出179例（179/217，82.5%）。嵌合型SCA样本61例，其中含有45，XO嵌合的样本有58例（58/61，95.1%）。（2）45，X病例较常见的产前诊断指征是水囊瘤（53/113，46.9%）及NT增厚（41/113，36.3%），而其他类型的SCA最常见的指征是无创产前检测（NIPT）高风险（170/272，62.5%）。（3）45，XO样本中，唯一的1条X染色体为母亲来源的有88例（88/113，77.9%），父亲来源25例（25/119，22.1%）。47，XXY样本中，染色体不分离发生在卵细胞减数分裂Ⅰ期（MⅠ）47例（47/118，39.8%），发生在精细胞MⅠ的有51例（51/118，43.2%），发生在卵细胞减数分裂Ⅱ期（MⅡ）有20例（20/118，16.9%）。47，XXX样本中，X染色体不分离发生在卵细胞MⅠ的有29例（29/48，60.4%），发生在卵细胞MⅡ期的有15例（15/48，31.3%），染色体不分离发生在精细胞MⅡ的有4例（4/48，8.3%）。综上，非嵌合型45，XO主要在早孕期有B超异常进行绒毛穿刺取样进行确诊，其他SCA病例主要通过无创产前检测（NIPT）结果异常而进行羊膜腔穿刺进行确诊。不同类型的SCA染色体不分离发生的亲源性和时期不同。.