应用荧光定量聚合酶链反应技术诊断胎儿弓形虫感染

目的　探讨荧光定量聚合酶链反应 (FQ PCR )技术用于产前诊断胎儿弓形虫 (TOX)感染及其防治措施。方法　采用FQ PCR技术 ,检测 70例孕期TOXDNA阳性孕妇的羊水和 (或 )脐血的TOXDNA ,阳性者为胎儿TOX感染。对其中 48例TOX感染孕妇给予螺旋霉素常规剂量治疗 2个疗程 ,观察其治疗效果。结果　 (1) 70例TOXDNA阳性孕妇中 ,胎儿TOXDNA阳性 2 1例 ,胎儿宫内TOX感染率为 3 0 % ,羊水和脐血中的TOXDNA阴、阳性结果一致。 (2 )胎儿宫内TOX感染与孕妇血中TOXDNA含量高低有关 ,孕妇血中TOXDNA含量高时 ,对胎儿危害严重 ,胎儿宫内感染率也最高(5 5 % ) ;TOXDNA含量低时 ,胎儿宫内感染率也最低 (2 0 % ) ,两者比较 ,差异有显著性 (P <0 0 5 )。 (3 )经螺旋霉素治疗的孕妇 ,其胎儿宫内感染率为 2 1% ,明显低于未治疗者的 5 0 % ,两者比较 ,差异有显著性 (P <0 0 5 )。结论　孕妇TOX感染可危害胎儿 ,FQ PCR检测羊水中TOXDNA可准确地诊断胎儿TOX感染 ,孕期治疗可降低宫内TOX感染率

Study on prenatal diagnosis using fluorescence quantitative polymerase chain reaction for congenital toxoplasmosis

Objective To investigate prenatal diagnosis and treatment of toxoplasmosis in fetuses with fluorescence quantitative polymerase chain reaction (FQ PCR) technique Methods Of the 70 pregnant women with toxoplasma(TOX) DNA positive , TOX DNA in amniotic fluid and/or fetal umbilical cord blood was detected with FQ PCR technique to diagnose fetal infection 48 ones were given routine treatment with spiramycin for 2 therapy periods Ultrasound examination were undertaken in all of pregnant women to monitor fetal growth Results Of the 70 cases with TOX DNA positive, TOX DNA was detected in 21 fetuses TOX DNA positive rates were similar in amniotic fluid and umbilical cord blood The higher the TOX DNA, the higher fetal infectious rate Fetal infectious rate was lower in treatment group(21%) than that in control group (50%), there was a statistically difference between two groups Conclusions Maternal TOX infection may cause fetal damage Detection of TOX DNA in amniotic fluid with FQ PCR technique can diagnose fetal toxoplasmosis exactly Treatment in pregnant period may decrease intrauterine infection rate