Investigation the longevity of hepatitis B surface antibody in vaccinated students of Hormozgan university of medical sciences.

Background and Objectives: Hepatitis B is a common chronic viral infection in humans. Universal use of hepatitis B vaccine is crucial for controlling the infection, but the duration of vaccine-induced immunity remains uncertain. This study aimed to assess hepatitis B antibody levels (anti-HBs) after vaccination in infancy and adolescence, and explore the relationship between immunity levels and variables such as age, sex, BMI, place of birth, and duration since last vaccination among students at Hormozgan University of Medical Sciences from 2019 to 2021. Materials and Methods: The study included 1134 students who completed a questionnaire and provided blood samples for ELISA-based measurement of antibody titers. Results: The findings revealed that 727 students (64.1%) had no protective antibody level (anti-HBs <10 mIU/ml), 299 (26.4%) had partial immunity (anti-HBs 10-100 mIU/ml), and 108 (9.5%) had complete immunity (anti-HBs >100 mIU/ml). No statistically significant relationships were observed between anti-HBs titer and age, sex, or BMI. However, antibody titer decreased with increasing time since last vaccination (P<0.001). Conclusion: This study highlights the decline in antibody titer over time following primary vaccination. Sustained immunity against hepatitis B virus relies on antibody durability or robust immunological memory, suggesting the importance of timing booster vaccinations.

Hepatitis B Surface Antigen Seropositive Men in Serodiscordant Couples: Effects on the Assisted Reproductive Outcomes.

PURPOSE: To evaluate the influence of hepatitis B virus (HBV) infection in men of serodiscordant couples on the reproductive outcomes. MATERIALS AND METHODS: A total of 134 infertile couples were included in this retrospective single-center cohort study. Sixty-six couples had hepatitis B surface antigen (HBsAg)-seropositive men and seronegative partners, while 68 couples were controls with both seronegative men and women. Overall, 134 fresh in-vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) treatments were performed. As the main outcome measures, on the day of the fresh IVF/ICSI cycle, we assessed seminal parameters Before and after sperm preparation techniques. Two-pronuclear (2PN) fertilization, 1-2-3PN fertilization, cleavage, miscarriage, pregnancy and live birth rates were collected. RESULTS: No significant differences were found between groups in terms of oocytes retrieved, oocytes injected and embryos obtained (p=0.64, p=0.97, and p=0.40, respectively). The 2PN fertilization rate (FR) was comparable among groups (p=0.51). The 1-2-3PN FR was significantly lower in the HBsAg group than in the control group (66.6% vs. 69.7%, respectively). The clinical pregnancy per cycle, implantation, miscarriage and live birth rate were comparable between the HBsAg group and the control group. The median sperm concentration/ml and total sperm count, measured at baseline and after sperm preparation, was comparable between groups (p>0.05). There was a trend toward significant lower progressive motility (35.0% vs. 55.0%; p<0.05) in the HBsAg group at baseline and after sperm preparation (p<0.05). CONCLUSIONS: HBV infected men have the same chance to became father, compared to seronegative patients.

ESTIMATION OF IMMUNOLOGICAL AND BIOCHEMICAL PARAMETERS IN HEPATITIS B POSITIVE PATIENTS.

BACKGROUND: Changes in immunological response have been reported during HBV infections, and these changes can be markers for the diagnosis and prediction of the outcome of infection The aim of this study was to measure and correlate serum levels of interleukin-2 (IL-2), C-reactive protein (CRP) Alanine aminotransferase (ALT), Aspartate aminotransferase (AST) and HBV antigens and antibodies in a sample of patients with HBV infection and in healthy controls. METHODOS: The study population consisted of 26 patients with hepatitis B infection (HBsAg seropositive), and 26 apparently healthy (HBsAg seronegative) participants as controls. Biochemical markers of liver disease were evaluated by routine methods. Hepatitis B antigens (HBVsAg, HBeAg) and antibodies (HBsAb, HBeAb, HBcAb) were determined using immunochromatographic method. Serum concentrations of IL-2, and CRP were determined using ELISA method. RESULTS: IL-2 level in HBsAg seropositive patients was found to be lower than that of control with no statistical significance while CRP level in HBV positive patients was higher than that of control with no statistical significance. HBV patients showed statistically significant difference in AST and ALT levels, compared to healthy controls. A statistically significant value was also observed between IL-2 and CRP in HBV infected individuals. CONCLUSION: The study concluded that deranged ALT and AST values correlate with HBV infection and may be a potential tool for disease diagnosis and progression.

[Early physical growth and disease analysis among children born delivered by HBsAg-positive mothers].

Objective: To estimate the early physical growth and disease in children born to HBsAg-positive mothers. Methods: This was a retrospective cohort study. Three areas as Xihu in Hangzhou, Lanxi in Jinhua, and Haiyan in Jiaxing in Zhejiang province were selected by cluster sampling. The growth outcomes of children born to HBsAg-positive mothers (exposure group) and matched 1∶1 women uninfected with HBV (control group) in 2014 were investigated and compared at birth, 6, 9, 12, and 18 months, respectively. There were totally 342 children in each group. Results: The incidences of low birth weight (LBW) for children born to exposure and control group were 1.8% (6/342), and 2.6% (9/342), respectively (P=0.433); and, rates of preterm birth were 2.3% (8/342), and 2.0% (7/342), respectively (P=0.794). The mean birth weight of children born to mothers without HBV infection (3.4±0.4) kg was dramatically higher than children in exposure group (3.3±0.4) kg (P=0.019). At 18 months, the average head circumference was significantly greater among children in control group (47.3±1.3) cm than children in exposure group (47.0±2.0) cm (P=0.038). Additional, mean birth weeks, height, weight, increases in height/weight/head circumference each month, weight/height/head circumference for age Z scores, proportion of growth retardation and low weight, disease prevalence were not observed statistically differences between two groups (P>0.05). All children born to HBsAg-positive mothers were received three-dose HBV vaccination. The rate of hepatitis B immunoglobulin for births born to HBsAg-positive was 98.8% (338/342). Mother to children transmission of HBV at 18 months was 1.0% (1/97). Conclusion: No significant differences in growth development and disease prevalence were found among children born to HBsAg-positive women and women without HBV infection.

Early hepatitis B viral DNA clearance predicts treatment response at week 96.

AIM: To investigate whether hepatitis viral DNA load at 24 wk of treatment predicts response at 96 wk in patients with chronic hepatitis B. METHODS: A total of 172 hepatitis B envelope antigen (HBeAg)-positive chronic hepatitis B patients who received initial treatment at 16 tertiary hospitals in Hunan Province, China were enrolled in this study. All patients received conventional doses of lamivudine and adefovir dipivoxil, telbivudine, entecavir dispersible tablets, or entecavir tablets for 96 wk. Patients who used other antiviral drugs or antitumor and immune regulation therapy were excluded. Patients were stratified into three groups according to their viral DNA load at 24 wk: < 10 IU/mL (group 1), 10-103 IU/mL (group 2), and > 103 IU/mL (group 3). Correlations of 24-wk DNA load with HBeAg negative status and HBeAg seroconversion at 96 wk were analyzed. Receiver operating characteristic curve analysis was used to test the predictive value of the HBV DNA load at 24 wk for long-term response. RESULTS: The rates of conversion to HBeAg negative status and HBeAg seroconversion rates were 53.7% and 51.9%, respectively, in group 1; 35.21% and 32.39% in group 2; and 6.38% and 6.38% in group 3. The receiver operating characteristic curves for the three subgroups revealed that the lowest DNA load (< 10 IU/mL) was better correlated with response at 96 wk than a higher DNA load (10-103 IU/mL). Nested PCR was used for amplifying and sequencing viral DNA in patients with a viral DNA load > 200 IU/mL at 96 wk; resistance mutations involving different loci were present in 26 patients, and three of these patients had a viral DNA load 10-103 IU/mL at 96 wk. CONCLUSION: Hepatitis B viral DNA load at 24 wk of antiviral treatment in patients with chronic hepatitis B is a predictor of the viral load and response rate at 96 wk.

HBV and HCV serological markers in health professionals and users of the Brazilian Unified Health System network in the city of Resende, Rio de Janeiro, Brazil / Marcadores sorológicos para HBV e HBC em profissionais de saúde e usuários da rede do Sistema Único de Saúde no Município de Resende, Rio de Janeiro, Brasil

ABSTRACT Introduction: Infections caused by the hepatitis B virus (HBV) and hepatitis C virus (HCV) are a major public health problem. Objectives: The study aimed to detect HBsAg, anti-HBc, anti-HBs and anti-HCV among health professionals and users of the Brazilian Unified Health System [Sistema Único de Saúde (SUS)] in the city of Resende, Rio de Janeiro, and to describe the sociodemographic profile and background of exposure. Methods: A total of 585 samples were collected between May and June 2014, obtained from the Brazilian Notifiable Diseases Surveillance System [Sistema de Informação de Agravos de Notificação (SINAN)] data, which were tested for HBsAg, anti-HBc, anti-HBs and anti-HCV. Results: The predominant age group observed was 30-44 years (n = 277; 47.3%), 54.87% (n = 321) were female and 271 (46.32%) self declared skin colour/ethnicity white. The married participants were 262 (44.78%), 42.22% graduated from high school (n = 247) and 174 were health professionals (29.74%). Four participants were anti-HCV reagents and 18 were anti-HBc reagents. From these, 15 participants were reactive for anti-HBs antibodies. Among health professionals, 68.8% were anti-HBs positive. And 63.9% of participants declared to be vaccinated against hepatitis B. Conclusion: The prevalence of 0.68% for HCV and 3.08% for anti-HBc are below that detected in the Southeast region from the last census in the capitals of Brazil. There is still a reduced acceptance among health professionals for HBV and HCV screening.

RESUMO Introdução: As infecções causadas pelo vírus da hepatite B (VHB) e C (VHC) constituem grave problema de saúde pública. Objetivos: O estudo visou detectar os marcadores HBsAg, anti-HBc, anti-HBs e anti-VHC em profissionais de saúde e usuários do Sistema Único de Saúde (SUS) no município de Resende, Rio de Janeiro, bem como descrever o perfil sociodemográfico e os antecedentes de exposição. Métodos: Foram avaliadas 585 amostras entre maio e junho de 2014, obtidas dos dados do Sistema de Informação de Agravos de Notificação (SINAN). Elas foram testadas para HBsAg, anti-HBc, anti-HBs e anti-VHC. Resultados: A faixa etária predominante observada foi de 30-44 anos (n = 277; 47,3%); 54,87% (n = 321) eram do sexo feminino e 271 (46,32%) se autodeclararam de cor da pele/etnia branca. Os participantes casados foram 262 (44,78%); 42,22% tinham o ensino médio (n = 247) e 174 eram profissionais de saúde (29,74%). Quatro participantes eram anti-VHC reagentes e 18, reagentes para anti-HBc. Destes, 15 eram anti-HBs reagentes (aHBs+). Nos profissionais de saúde, 68,8% possuem aHbs+. Em relação à vacinação contra hepatite B, 63,9% declararam possuí-la. Conclusão: As prevalências 0,68% de VHC e de 3,08% de anti-HBc estão abaixo da detectada na região Sudeste no último censo nas capitais do Brasil. Há ainda reduzida adesão dos profissionais de saúde à testagem para VHB e VHC.

Early physical growth and disease analysis among children born delivered by HBsAg-positive mothers / 中华预防医学杂志

Objective@#To estimate the early physical growth and disease in children born to HBsAg-positive mothers.@*Methods@#This was a retrospective cohort study. Three areas as Xihu in Hangzhou, Lanxi in Jinhua, and Haiyan in Jiaxing in Zhejiang province were selected by cluster sampling. The growth outcomes of children born to HBsAg-positive mothers (exposure group) and matched 1∶1 women uninfected with HBV (control group) in 2014 were investigated and compared at birth, 6, 9, 12, and 18 months, respectively. There were totally 342 children in each group.@*Results@#The incidences of low birth weight (LBW) for children born to exposure and control group were 1.8% (6/342), and 2.6% (9/342), respectively (P=0.433); and, rates of preterm birth were 2.3% (8/342), and 2.0% (7/342), respectively (P=0.794). The mean birth weight of children born to mothers without HBV infection (3.4±0.4) kg was dramatically higher than children in exposure group (3.3±0.4) kg (P=0.019). At 18 months, the average head circumference was significantly greater among children in control group (47.3±1.3) cm than children in exposure group (47.0±2.0) cm (P=0.038). Additional, mean birth weeks, height, weight, increases in height/weight/head circumference each month, weight/height/head circumference for age Z scores, proportion of growth retardation and low weight, disease prevalence were not observed statistically differences between two groups (P>0.05). All children born to HBsAg-positive mothers were received three-dose HBV vaccination. The rate of hepatitis B immunoglobulin for births born to HBsAg-positive was 98.8% (338/342). Mother to children transmission of HBV at 18 months was 1.0% (1/97).@*Conclusion@#No significant differences in growth development and disease prevalence were found among children born to HBsAg-positive women and women without HBV infection.

Can hepatitis B virus DNA in semen be predicted by serum levels of hepatitis B virus DNA, HBeAg, and HBsAg in chronically infected men from infertile couples?

Hepatitis B virus (HBV) in semen is important for father-to-child transmission of HBV and has adverse effects on sperm quality. However, risk factors associated with HBV in semen remain unclear. Serum HBV DNA and hepatitis B e antigen (HBeAg) levels may pose a risk on HBV in semen. This study aims to examine whether serum HBV DNA, HBeAg, and hepatitis B surface antigen (HBsAg) level were associated with HBV DNA in semen. 151 male patients chronically infected with HBV from infertile couples were included. Serum HBsAg and HBeAg were determined using an electrochemiluminescence immune assay (ECLIA). Serum and seminal plasma HBV DNA were detected by the QIAGEN Real-Time HBV DNA assay. Of 151 patients, 143 (94.7%) were serum HBV DNA-positive and 65 (43.0%) were seminal plasma HBV DNA-positive. Serum HBV DNA and HBeAg level of seminal plasma HBV DNA-positive patients were significantly higher (p < 0.001) as compared with those of seminal plasma HBV DNA-negative patients, HBsAg level of seminal plasma HBV DNA-positive patients was significantly lower (p < 0.001) compared with that of seminal plasma HBV DNA-negative patients. The best serum HBV DNA, HBeAg, and HBsAg value for discriminating between seminal plasma HBV DNA-positive and HBV DNA-negative patients were ≥6.9 log10 IU/mL (sensitivity 100.0%, specificity 90.7%), >14.8 S/CO (sensitivity 96.9%, specificity 81.5%), and <1791.5 S/CO (sensitivity 81.5%, specificity 81.2%), respectively. The combination of serum HBV DNA and HBeAg had high diagnostic sensitivity (100.0%) and specificity (95.4%) for the presence of HBV DNA in semen. As such, these serum markers especially the combination of HBV DNA and HBeAg are useful predictors of the presence of HBV DNA in semen in HBV chronically infected men from infertile couples.

Detection of double mutant X antigen/antibody in sera of patients with hepatitis B virus infection and its implication / 中华传染病杂志

Objective To explore the correlation between serum hepatitis B virus (HBV) X antigen/antibody (HBxAg-wild/HBxAb-wild,and HBxAg-mutant/HBxAb-mutant) and the disease progression in patients with chronic HBV infection.Methods A direct enzyme immunosorbent asssay (ELISA) was performed to detect HBxAb using recombinant antigen,and a double antibody sandwich ELISA assay to detect HBxAg using monoclonal antibody and specific rabbit polyclonal antibody.HBxAg-wild/HBxAb-wild and HBxAg-mutant/HBxAb-mutant were tested in sera from cases at different stages of chronic HBV infection.A chi-square test was employed to examine statistical significance.Results The positive rates of HBxAg-wild and HBxAg-mutant in the chronic asymptomatic HBV carriers,chronic hepatitis,hepatitis B-related cirrhosis and liver cancer were 6.2％ (2/32),10.7％ (3/28),28.6％ (6/21),43.6％ (17/39) and 3.1％ (1/32),10.7％ (3/28),33.3％ (7/21),48.7％ (19/39),respectively.The positive rates of HBxAb-wild and HBxAb-mutant in the above mentioned groups were 6.2％ (2/32),21.4％ (6/28),38.1％ (8/21),53.8％ (21/39)and 6.2％ (2/32),25.0％ (7/28),42.9％ (9/21),61.5％ (24/39) respectively.The positive rates of HBxAg-wild and HBxAg-mutant were not significantly different among the above groups (x2 =0.871,0.780,0.565 and 0.317,respectively; all P＞0.05) ; The positive rates of HBxAb-wild and HBxAb-mutant were also similar among all the groups (x2 =0.780,0.709,0.580 and 0.210,respectively; all P＞0.05).The positive rates of HBxAg-wild,HBxAb-wild,HBxAg-mutant,HBxAb-mutant in patients with low viral loads (HBV DNA＜1 × 104 copy/mL) were 36.5％ (23/63),44.4％ (28/63),42.9％ (27/63) and 54.0％ (34/63),respectively,those in patients with high viral loads (HBVDNA≥1×104 copy/mL) were 8.8％ (5/57),15.8％ (9/57),5.3％ (3/57) and 14.0％ (8/57),respectively.The positive rates of HBxAg and HBxAb were significantly higher in cases with low viral loads than those with high viral loads (x2 =12.869,11.522,22.556 and 20.976,respectively; all P＜0.05).The positive rates of HBxAg-wild,HBxAb-wild,HBxAg-mutant,HBxAb-mutant in the HBeAg positive group were 21.7％ (18/83),30.1％ (25/83),22.9％ (19/83) and 32.5％ (27/83),respectively,while those in the HBeAg negative group were 27.0％ (10/37),32.4％ (12/37),29.7％ (11/37) and 40.5％ (15/37),respectively.No significant difference of HBxAg/HBxAb positive rates between HBeAg positive group and HBeAg negative group was noticed (x2 =0.408,0.064,0.638 and 0.722,respectively; all P＞0.05).Conclusions The antigenicity and specificity of HBV X protein remains similar after the occurrence of A1762T/G1764A double mutant in X gene.It is also found that the positive rates of HBxAg and HBxAb increase with disease progression.HBxAg/HBxAb might be promoting factors for tumorigenesis in chronic HBV infection.HBxAg and HBxAb might have negative influence on HBV replication.

Retrospective analysis of hepatitis B virus serological markers in 70 582 inpatients / 中华检验医学杂志

Objective To analyze the detection rate of HBV serological makers in non-hepatic inpatients in the past six years. Methods Serum samples of 70 582 non-hepatic inpatients from three large hospitals were collected during 2003 to 2008. Serological markers of HBV ( HBsAg, anti-HBs, HBeAg, antiHBe and anti-HBc) were detected by the AxSYM MEIA system (Abbott Laboratories,Abbott Park,IL).Combining the test results of serological makers with other clinical data, several analysis models for this retrospective study were set up to evaluate the year-to-year changes in serological makers and the detection rates of each model. Results The order from high to low of detection rate of the 5 HBV serological markers was anti-HBc (55. 17% ), anti-HBs (49. 57% ), anti-HBe (28.42%), HBsAg ( 8. 92% ) and HBeAg (2. 12% ), and all of them had a downward trend in the past six years. The positive rate of HBsAg went down from 9. 30% (2003) to 8.70% (2008). The positive rate of HBsAg among people who were born after 1992 (2. 28% ) were significantly lower than that of the overall population (8. 92% ) and fell from 3.57%(2003) to 1.85% (2008). Each detection rate of all serological makers had male sexual side effect [HBsAg ( 12. 38%/7. 25% ), HBeAg ( 2. 72%/1.58% ), anti-HBc ( 56. 57%/53.43% ), anti-HBe (41.50%/28. 35% ) and anti-HBs (65.48%/50. 00% ), male/female]. The differences were statistically significant (Chi-square values of HBsAg, HBeAg, anti-HBc, anti-HBe and anti-HBs were 509.74,105.78, 69.66, 1 321.61 and 1 726.91, respectively; all P ＜ 0. 01).Twenty-six models of HBV serological makers from 70 582 inpatients were summed up, and 8 models had positive rates geater than or equal to 1%. The "All Negative" model ranked No. 1 and had no significant change from year to year. During the past six years, models representing "A11 Negative" and "anti-HBs Positive alone" were mainly in individuals younger than or equal to 20-year-old, while the models representing "anti-HBc and/or anti-HBe,anti-HBs Positive" were mostly in people older than 20-year-old. The distribution curve of models representing "HBsAg, HbeAg and anti-HBc Positive" and "HBsAg, anti-HBc, anti-HBe Positive"etc. showed a bell-shape, covering the population from 20-year-old to 70-year-old. Conclusions The slowlydescending tendency of the detection rates of HBV serological makers was observed during the past six years.The detection rates of HBV in the younger generation decreased significantly. However, the HBV infection rates of overall population is still high, so it is a high time that we made continuous improvement for the serum HBV screening technique in order to reduce the HBV infection ratess.

Natural History of Chronic Hepatitis B in Children / 소아과

PURPOSE: We investigated the spontaneous seroconversion rate of hepatitis B viral markers and predictive factors affecting seroconversion in children with chronic hepatitis B. METHODS: The study population included 214 children diagnosed as chronic hepatitis B, with positive HBsAg, HBeAg and HBVDNA over six months, and all patients had a family history of chronic Hepatitis B. They were followed between May 1982 and Febrary 2003 in the Department of Pediatrics, Yonsei University College of Medicine. Serum HBsAg, HBeAg, anti-HBs, HBVDNA, and AST/ALT were measured every six months. RESULTS: The mean age of patients was 7.4+/-4.5 years. The loss of HBeAg, HBVDNA and HBsAg were observed in 44(19.2%), 34(15.9%) and 3(1.4%) children respectively. The patients with serum ALT levels over three times normal and with HBVDNA less than 1,000 pg/dL showed significantly higher seroconversion rates of HBeAg and HBVDNA(P<0.001). By analyzing with the life table method, the cumulative seroconversion rate of HBeAg was 11% at 10 and 35% at 19 years of age, while HBVDNA was 9% at 10 and 32% at 19 years of age. In cases of HBsAg, the cumulative seroconversion rate was only 1.5% at 19 years of age. The age of patients, serum ALT and HBVDNA levels were proven as signifincant factors influencing the seroconversion of HBeAg and HBVDNA(P<0.001). CONCLUSION: In children with chronic hepatitis B, the seroconversion rate of HBeAg and HBVDNA are expected to be 35% and 32%, respectively, by the age of 19 years. The age of patients, serum ALT and HBVDNA levels seem to have significant influence on HBeAg and HBVDNA seroconversion.

The influence of HBV replication regulator on the immune response induced by HBV DNA vaccine / 中华传染病杂志

Objective To study the influence of HBV replication regulator,enhancer I and Pre- S2,on the immune response of HBV DNA vaccine.Methods DNA fragments of HBsAg,PreS2 HBsAg,HBsAg-enhancer I and PreS2-HBsAg-enhancer I region of HBV were amplified by PCR using the complete genome DNA of HBV adr subtype,and inserted into VR1012 vectors,respective- ly.The recombinant plasmids were transfected into HepG2 cells,and injected into Balb/C mice.The expression of HepG2 cells and the cellular and humoral immune response of mice were tested by cell immuno-chemistry,ELISA and ELISPOT.Results The target protein were expressed by transfected HepG2 cells,enhancer I and Pre-S2 can promote the expression of HBsAg in transfected cells.The HBsAb and the HBsAg specific CTL in inoculated mice were found in the second week after injection, PreS2 but not enhancer I can promote the immune response in inoculated mice.Conclusions When inserted into HBV DNA vaccine,enhancer I and PreS2 can promote the expression of HBsAg in transfected HepG2 cells,PreS2 can promote the immune response in inoculated Balb/C mice.

Durabilidad de la respuesta inmune antihepatitis B en trabajadores de la salud peruanos con 6 años de vacunados

Partiendo de la importancia que la Organización Mundial de la Salud y el Centro para el Control de las Enfermedades le atribuyen a la protección de los trabajadores de la salud contra la hepattis viral tipo B (VHB), en 1993 el Instituto Peruano del Seguro Social (hoy ESSALUD), orientó la vacunación del personal de riesgo en los 4 hospitales nacionales, mediante la vacuna cubana Heberbiovac HB (20 mg, esquema 0-1-2 meses). El propósito fue evaluar la persistencia de los anticuerpos en los vacunados después de 6 años de la inmunización y la posible existencia de marcadores de infección por el virus B. Se estudiaron los sueros de 144 trabajadores de la salud, para una cobertura de 70,24 % en relación con los seroprotegidos en el estudio inicial. Para la detección de los marcadores en el suero se emplearon métodos inmunoenzimáticos comerciales. El AgsHB y el anti-AgcHB fueron negativos en todas las muestras serológicas, por lo que se afirmó que en ninguno de los vacunados hubo evidencias de infección por este virus. El anti-AgsHB fue positivo, todos presentaban seroconversión, con seroprotección e hiperrespuesta de 91,6 y 43,7 %, respectivamente. El tiempo de vida media del anti-AgsHB (t ½) es de 3 años, se pronosticó que los niveles de anticuerpos serían superiores a 10 UI/L hasta después de 15 años de finalizado el esquema. Los menores de 40 años tuvieron niveles de seroprotección e hiperrespuesta significativamente mayores; las mujeres se mantuvieron en categorías de respuesta superiores. Se recomendó evaluar la memoria pos-refuerzo en los casos de seroconversión, no seroprotegidos, y extender el trabajo con ESSALUD a otros hospitales del país.

On the basis of the importance given by the Health World Organization and the Disease Control Center to the protection of health workers against viral hepatitis B(HBV), the Peruvian Institute of Social Security(presently ESSALUD) instructed in 1993 the vaccination of health personnel at risk in 4 national hospitals by using the Cuban vaccine called Herberbiovac HB(20 mg, 0,1,and 2 month schedule). The purpose was to evaluate the persistence of antibodies in the immunized workers six years after the immunization program and the possible presence of HB virus infection markers. Sera from 144 health workers were studied covering 70.24% of seroprotected subjects in comparison with seroprotected subjects in the initial study. Conventional immunoenzymatic methods were used to detect markers in the serum, HbsAg and antibodies to HbcAg were negative in all the serological samples, an outcome that showed that any of the vaccinated persons had traces of HB virus infection. The anti-HbsAg was positive, seroconversion was 100% whereas seroprotection and hyperesponse amounted to 91.6 and 43.7% respectively. The mean lifetime of anti-HbsAg is 3 years but it was predicted that the levels of antibodies would reach over 10 UI/L after 15 years of the vaccination schedule completion. Subjects aged under 40 years had significantly higher levels of seroprotection and hyperesponse, being females those in the higher response categories. The evaluation of the post-vaccination reinforcement immunological response in seroconverted non-seroprotected cases and the extension of the work with ESSALUD to other hospitals in the country were recommended.

Screening of phage antibodies against HBsAg from the constructed phage display library and sequencing of the positive clones / 中国病理生理杂志

AIM: Screening of phage antibodies against HBsAg from the constructed phage display library and sequencing of the positive clones.METHODS: RNAs were extracted from blood lymphocytes of a HBsAg-immunized volunteer. Then cDNAs were synthesized by RT-PCR. To construct the phage antibody display library, cDNAs of Fd fragments and ? chains of the antibodies were amplified through PCR and were inserted into vector pComb3H. Three rounds panning against coated HBsAg showed the specific enrichment of phage antibody. Positive clones were selected and sequenced.RESULTS: A phage antibody display library was constructed after amplifing of Fd fragments and ? chains of IgG1. Three Fab antibodies from the library were selected and sequenced. The result of sequencing showed that two of the three antibodies had the same Fd fragment and all of the three had the same light chain. CONCLUSION: The phage antibody display library was constructed successfully and three specific antibodies (Fab fragments) have been obtained from it.

Immunohistochemical Observation of 6 Antigen in Liver Sections from the Patients with Severe Hepatitis B in Chongqing Area / 第三军医大学学报

The immunohistocheinical observation of & antigen in liver sections from 27 cases of severe hepatitis B (SHE) was performed with ABC method and the result was compared with that of & antibody in the sera. 6 cases of SHB were & antigen positive in liver sections (6/27, 22.22%) . It showed a high attack rate of ? agent in SHE cases in Chongqing area. The detective rate for 5 agent infection could be increased by the immunohistochemical measurement. There was positive staining in both nuclei and cytoplasm in all the 6 cases.