[Analysis of loss to follow-up status and influencing factors of children born to pregnant women with HIV infection in China in 2019].

To understand the loss to follow-up of children born to pregnant women with HIV infection (HIV-exposed children) and analyze its influencing factors in China in 2019. The data were collected from the follow-up records of pregnant women with HIV infection and their children reported by the national "Management Information System for the Prevention of HIV, syphilis and Hepatitis B Mother-to-Child Transmission" in 2019. HIV-exposed children were defined as those who were not followed up after birth or who were not followed up at 18 months of age and who were not followed up at 21 months of age. The univariate and multivariate influencing factors of loss to follow-up of children born to HIV-infected pregnant women were analyzed by test and logistic regression model. SPSS 25.0 software was used for statistical analysis. The number of HIV-infected pregnant women was 5 039, the number of live-born children was 5 035, the number of loss to follow-up children within 18 months of age was 283, and the loss to follow-up rate children was 5.62%(283/5 035). The results of multivariate logistic regression analysis showed that the rate of loss to follow-up of exposed children born to pregnant women who worked as farmers (animal husbandry and fishery) (a=0.34, 95%: 0.22-0.53), unmarried (a=0.47, 95%: 0.24-0.93), first marriage (a=0.38, 95%: 0.22-0.67), remarriage (a=0.36, 95%: 0.20-0.67) and cohabiting (a=0.47, 95%: 0.23-0.97), and knew they had HIV infection before this pregnancy (a=0.53, 95%: 0.40-0.70) was lower. Han nationality (a=1.52, 95%: 1.09-2.13), primary school (a=2.06, 95%: 1.10-3.89) and junior middle school (a=1.81, 95%: 1.03-3.17) educational level, non-use of antiviral drugs (a=6.21, 95%: 4.32-8.93) and delivery in township (street) level midwifery institutions (a=5.72, 95%: 1.61-20.27) had higher rates of loss to follow-up among infants born to HIV-infected pregnant women. HIV-exposed children still have a specific rate of loss to follow-up in China in 2019. In order to further reduce the rate of loss to follow-up, it is of great significance to improve the detection rate of HIV before pregnancy and the rate of antiviral drugs used in pregnant women with HIV infection, which is of great significance for the effective implementation of comprehensive intervention measures of prevention of mother-to-child transmission of HIV.