Could Anti-Retroviral Treatment Affect the Profile of Hepatitis B Vaccine Specific Antibody in Vertically HIV-Infected Children?

Paediatric immunisation had been relevant in reducing the widespread of Hepatitis B virus, as an outcome of the induction of hepatitis B surface antigen specific-IgG antibodies (anti-HBs). Studies revealed alteration effects of memory B cells during antiretroviral therapy (ART). We aimed at assessing anti-HBs response profile with respect to the most prominently used ART regimens in children. a cross-sectional study was conducted in 116 participants made up of 72 HIV-exposed and infected children, subdivided into 20 antiretroviral-naive on one hand and on another hand 52 ARV treated children made up of regimen subgroups, including 8 ABC-3TC-EFV/NVP (ART-R1), 19 ABC-3TC-LPV/r (ART-R2), 21 AZT-3TC-NVP (ART-R3) and 4 AZT-3TC-LPV/r (ART-R4), and 44 HIV-uninfected and unexposed (HUx or control group) children. Participants included in this study were regularly vaccinated children aged between 4 months and 5 years old, born to HIV-infected mothers. An optimized and adapted home-made ELISA and BioELISA(R) Biohit kit were used to measure specific IgM, IgG and IgG subclasses to HBs in children. As result, this study showed that the rates of vaccine protective response in children treated with ART under regimens R1, R2, R3 and R4 were 25%, 38%, 51% and 75%, respectively. These protective response rates were significantly lower (p<0.0001) in children under R1, R2 and R3 than the control group (92%). When comparing anti-HBs specific IgM and IgG response medians; IgM response levels were similar in both control and ARV treated children, whereas R1 (p=0.0045), R2 (p=0.0016), and R4 (p<0.0001) showed significantly lower IgG level compared to the control group. Anti-HBs IgG subclass profile pattern in the control was IgG3{approx}IgG1{approx}IgG4>IgG2. However, IgG3{approx}IgG1{approx}IgG4>IgG4 profile pattern was estimated for children submitted to R1, R2 and R4, and the profile pattern of IgG3>IgG1{approx}IgG4{approx}IgG2 in those treated with R3 which also showed the most prominent anti-HBs IgG response mean rank level.