Application of TMA Technology in Donors' HBV-DNA Detection / 中国实验血液学杂志

OBJECTIVE@#To understand the infection of hepatitis B virus(HBV) in blood donors, and to evaluate the effectiveness and necessity of TMA technology for HBV-DNA screening in blood donors.@*METHODS@#Using the ELISA/NAT model, routine serology test and NAT were performed in the 169 160 donors，including voluntary blood donors and some of donors returned to donor team. For some donors with test positive NAT, nucleic acid identification test was performed. And the HBsAg neutralized and confirmed assay would conduct in blood donors with unilateral HBsAg positive and HBV-DNA negative result.@*RESULTS@#Among 169 160 donation cases-times, the donors of bilateral positive of HBsAg detection was 803, accounted for 0.476%; donors of unilateral positive was 243, accounted for 0.144%. For 40 specimens with HBV-DNA negative, unilateral HBsAg positive, the neutralization and confirmed assay was performed.In result, only 4 specimens were confirmed to be HBsAg positive, the confirmed positive rate was 10%. Among detected 1003 specimens with HBV-DNA positive specimens, both HBsAg and HBV-DNA positive were 739, the consistency rate between 2 kinds of detection was 73.7%. The comparision of positive rate detected by using 3 kinds of reagents showed that there were statistical differences (P＜0.05); moreover, there were statistical difference in positive rate detected by using Murex reagent and In Tec reagent (P＜0.0125). The comparison of detected rate of HBsAg and HBV-DNA during March 2016-February 2017 showed no statistical difference (P＞0.05). Among 60 blood donors with HBsAg and HBV-DNA who has retured to the donor team, 1 donor presented the transformation of HBsAg from negative to positive, suggesting the HBV infection of window period, HBsAg of the other 59 was negative. The detection of HBV-DNA showed that the HBV-DNA in 28 donors was negative, and the HBV-DNA in 31 donors was positive, 1 donor showed HBV-DNA was uncertain.@*CONCLUSION@#The routine TMA technology combined with ELISA HBsAg can effectively shorten the window period for detection of HBV infection, effectively detect the occult HBV infection, and reduce the potential risk of hepatitis B spread due to blood transfusion.

RHD gene polymorphism of RhD negative individuals in population of Fujian province / 中国实验血液学杂志

To investigate the RHD gene profiles of RhD-negative individuals in population of Fujian Province, it was to design fourteen pairs of specific primers to amplify RHD exon 1, 3 approximately 7, 9, 10, hybrid Rh box, RHD 1227A allele, RHC allele, RHc allele, RHE allele and RHe allele. Rh genotypes were detected by PCR-SSP in 104 RhD-negative donors, some samples with or without RHD genes were analysed by the absorption-elution test, and two RhD-negative samples with eight RHD exons detected were analysed by DNA sequencing. The results showed that 61.54% RhD-negative individuals lacked all the eight RHD exons detected (RHD-/RHD-), 25.97% carried the RHD 1227A allele (62.96% of which were the heterozygote of RHD+/RHD-, and 37.04% were the homozygote of RHD+/RHD+), 8.65% carried the RHD-CE (2 approximately 9)-D allele (RHD+/RHD-), and 1.92% carried the RHD 710delC allele (RHD+/RHD-). Though the most cases of RHD gene deletion were found in dce haplotype, six cases of RHD gene deletion were found in dCe (their RH genotypes were dce/dCe) and two in dcE haplotype (their RH genotypes were dce/dcE). And it was not accurate to predict the Rh phenotype by detecting a single RHD exon, however, and more accurate when eight RHD exons and RHD 1227A allele were detected (chi2=24.43, p<0.005). It is concluded that RHD genes in population of Fujian Province are polymorphic and the RHD genotyping is not reliable enough to replace the RhD serotyping in China.