Level of Antibody Response against Hepatitis B Virus after Vaccination and Seroprevalence of HBV in Children Addis Ababa, Ethiopia

Approximately 2 billion people worldwide are infected with HBV and more than 240 million are chronic carriers. The World Health Organization officially launched the introduction of the hepatitis B vaccine for children in 1980. Since then, different countries have determined the level of response to the vaccine. Since the introduction of the vaccine in Ethiopia in 2007, there have been few studies evaluating the antibody response to the HBV vaccine. Therefore, the purpose of this study is to determine the HBV antibody response after hepatitis B vaccination and to evaluate the HBV seroprevalence of children in Addis Ababa, Ethiopia. A cross-sectional study was conducted using a multistage probability sampling technique. Four hundred and fifty children between the ages of five and eight living in Addis Ababa were enrolled. Socio-demographic characteristics were obtained through a structured questionnaire and three to four ml of blood was collected from each child. ELISA was performed to determine antibody levels against HBV. The average age is seven + one (SD) years. Anti-HBs were detected in 54.3% (208/450) of children, and girls 98 (54.7%) had a slightly higher level of protection than boys 110 did (53.9%). The overall coverage rate of the vaccine in this study was 85.1%. The proportion of children with protective levels (> 10 mIU / ml of anti-HBs antibodies) decreased with increasing age of the children: 5, 6, 7 and 8 years were 52.6%, 60%, 43.5% and 37.1%, respectively. The seroprevalence rate for HBsAg is 0.4% and the seroprevalence rate for anti-HBc is 5.6%. Age and antibody response level were negatively correlated (p = 0.001), while gender and history of HBV infection were not significantly correlated. Age was also significantly correlated with anti-HBc seropositivity (p = 0.003). HBV vaccine coverage for children is high, but the antibody response to the vaccine appears to be low. The seropositivity rate for the virus is also very low. Low levels of response to the vaccine should be a problem. For unresponsive children, revaccination or booster doses should be considered. More research needs to be done

Maternal Hepatitis Infections: Determining Seroprevalence of Hepatitis B and C Virus Infections and Associated Risk Factors among Healthy Mothers in Addis Ababa, Ethiopia

Introduction: Viral hepatitis is a global public health problem affecting millions of people every year, causing disability and death. Hepatitis B (HBV) and hepatitis C (HCV) viruses spread horizontally, mainly through sexual contact and contaminated needles, and vertically. Both cause considerable morbidity and mortality worldwide. Maternal infection is a risk factor for vertical transmission. Objective: To determine the seroprevalence of HBsAg and anti-HCV antibody among non-pregnant, apparently healthy mothers and to identify potential risk factors associated with HBV or HCV infection. Methods: A community based cross sectional study was conducted on 454 apparently healthy women, in Addis Ababa, Ethiopia from May 2016 to June 2017. A systematic random sampling method was used to recruit participants. Result: A total of 454 mothers were enrolled. Seroprevalence of HBsAg and HCV was found to be 3.7% and 2.0%, respectively. HBc antibody was detected in 36.3% of the mothers. None of the participants was co-infected with both viruses. Previous history of liver disease, history of jaundice, HIV infection, and family history of liver disease were significantly associated with HBV infection. Marital status, caring for hepatitis patients, and a history of liver disease were factors significantly associated with HCV infection. Conclusion: Apparently, healthy mothers in Addis Ababa had intermediate level of endemicity for hepatitis B and C infections Routine screening and vaccination of high-risk reproductive mothers against HBV is advisable. Emphasis should be given to health education and promotion of infection control practices. Population based studies are strongly recommended to help monitor disease transmission patterns and to design evidence-based interventions against the spread of hepatitis infections in Ethiopia

Genotype characterization of Epstein–Barr virus among adults living with human immunodeficiency virus in Ethiopia

BackgroundEpstein–Barr virus (EBV) is a human lymphotropic herpesvirus with a causative agent in cancer. There are two genotypes of EBV (EBV genotype 1 and EBV genotype 2) that have been shown to infect humans. This study aimed to characterize the EBV genotype among people with human immunodeficiency virus (PWH) and HIV-negative individuals in Ethiopia.MethodsDNA was extracted from peripheral blood mononuclear cells (PBMCs). Conventional polymerase chain reaction (cPCR) targeting EBNA3C genes was performed for genotyping. A quantitative real-time PCR (q-PCR) assay for EBV DNA (EBNA1 ORF) detection and viral load quantification was performed. Statistical significance was determined at a value of p < 0.05.ResultIn this study, 155 EBV-seropositive individuals were enrolled, including 128 PWH and 27 HIV-negative individuals. Among PWH, EBV genotype 1 was the most prevalent (105/128, 82.0%) genotype, followed by EBV genotype 2 (17/128, 13.3%), and mixed infection (6/128, 4.7%). In PWH, the median log10 of EBV viral load was 4.23 copies/ml [interquartile range (IQR): 3.76–4.46], whereas it was 3.84 copies/ml (IQR: 3.74–4.02) in the HIV-negative group. The EBV viral load in PWH was significantly higher than that in HIV-negative individuals (value of p = 0.004). In PWH, the median log10 of EBV viral load was 4.25 copies/ml (IQR: 3.83–4.47) in EBV genotype 1 and higher than EBV genotype 2 and mixed infection (p = 0.032).ConclusionIn Ethiopia, EBV genotype 1 was found to be the most predominant genotype, followed by EBV genotype 2. Understanding the genotype characterization of EBV in PWH is essential for developing new and innovative strategies for preventing and treating EBV-related complications in this population

Intestinal Parasitic Infections and Associated Risk Factors among Food Handlers of Food and Drinking Establishments in Woldia Town, North-East Ethiopia: A Cross-Sectional Study

Background. Food handlers should be screened periodically for intestinal parasitic infections, and they should be treated to reduce intestinal parasite transmission to consumers through contaminated foods and drinks. Therefore, this study aimed to assess the prevalence and associated risk factors of intestinal parasitic infection among food handlers in Woldia town, North-East Ethiopia. Method. A community-basedcross-sectional study was conducted among food handlers in Woldia town, North-East Ethiopia. A structured questionnaire was used to collect sociodemographic characteristics and intestinal parasite-associated risk factors. Microscopic examination of a stool sample was performed using wet-mount and formol-ether concentration techniques. Data were analyzed using SPSS version 20.0 statistical software packages. Bivariate and multivariate analyses were performed to investigate the association between intestinal parasitic infections and associated risk factors. In all comparisons, P value <0.05 was considered as statistically significant. Result. The overall prevalence of intestinal parasitic infection among food handlers in Woldia town was 14.3%. Six different intestinal parasites were detected. The majority of the parasites identified were helminthic infections 37/52 (71%). Ascaris lumbricoides was the most dominant parasite (7.7%), followed by E. histolytica/dispar (2.7%) and G. lamblia (1.4%). Multivariate logistic regression analysis showed that intestinal parasitic infection had a statistically significant association with food handlers’ habits of hand washing without soap after latrine use (P<0.01), swimming habit (P=0.03), and using a common knife (P<0.01). Conclusion. This study revealed a relatively high prevalence of intestinal parasites among food handlers in Woldia town. Strict and standard hygienic and sanitary practices should be implemented by food handlers. Moreover, food handlers should be screened for intestinal parasitic infection, and health education should be given periodically

Genotypes Distribution of Epstein–Barr Virus among Lymphoma Patients in Ethiopia

Epstein–Barr virus (EBV) is an oncogenic herpes virus associated with several human malignancies. Two main EBV genotypes (type 1 and type 2) distinguished by the differences in EBV nuclear antigens are known. Geographic variability in these genetic differences has been observed in the incidence of some EBV-related tumors. Here, we investigated the genetic variation of EBV in lymphoma specimens collected in Ethiopia. A total of 207 DNA samples were used for EBV detection and typing, and EBNA1 and EBNA3C genes were used to detect and subtype the EBV genome, respectively. EBV genotype 1 was detected in 52.2% of lymphoma patients. EBV genotype 2 was detected in 38.2% of the lymphoma patients, and 9.7% were coinfected by both EBV genotypes. Overall, 52.8% of the Hodgkin’s lymphoma (HL) patients and 51.8% of non-Hodgkin’s lymphoma (NHL) patients showed the presence of genotype 1. Meanwhile, 42.8% and 2.3% of HL patients and 35.8% and 12.4% of NHL patients showed EBV genotype 2 and both genotypes, respectively. Significant associations between the age groups and EBV genotypes were observed (p = 0.027). However, no significant association was seen between EBV genotypes and other sociodemographic and clinical characteristics. This study showed that the distribution of EBV genotype 1 was higher in Ethiopian lymphoma patients

The Burden of Epstein–Barr Virus (EBV) and Its Determinants among Adult HIV-Positive Individuals in Ethiopia

Epstein–Barr virus (EBV) is a well-known risk factor for the development of nasopharyngeal carcinoma, Hodgkin’s lymphoma (HL), and Non-Hodgkin’s lymphoma (NHL). People with HIV infection (PWH) are at increased risk for EBV-associated malignancies such as HL and NHL. Nevertheless, there are limited data on the burden of EBV among this population group in Ethiopia. Hence, this study aimed to determine the burden of EBV infection among adult HIV-positive individuals in Ethiopia and assess the determinants of EBV DNA positivity. We conducted a cross-sectional study at the Tikur Anbessa Specialised Hospital from March 2020 to March 2021. Two hundred and sixty individuals were enrolled in this study, including 179 HIV-positive and 81 HIV-negative individuals. A structured questionnaire was used to capture demographic and individual attributes. In addition, the clinical data of patients were also retrieved from clinical records. EBV viral capsid antigen (VCA) IgG antibody was measured by multiplex flow immunoassay, and EBV DNA levels were tested by quantitative real-time polymerase chain reaction (q-PCR) assays targeting the EBNA-1 open reading frame (ORF). Descriptive statistics were conducted to assess each study variable. A multivariable logistic regression model was applied to evaluate the determinants of EBV infection. Statistical significance was determined at a p-value < 0.05. Two hundred and fifty-three (97.7%) study participants were seropositive for the EBV VCA IgG antibody. Disaggregated by HIV status, 99.4% of HIV-positive and 93.8% of HIV-negative participants were EBV seropositive. In this study, 49.7% of HIV-positive and 24.7% of HIV-negative individuals were EBV DNA positive. PWH had a higher risk of EBV DNA positivity at 3.05 times (AOR: 3.05, 95% CI: 1.40–6.67). Moreover, among PWH, those with an HIV viral load greater than 1000 RNA copies/mL (AOR = 5.81, 95% CI = 1.40, 24.13) had a higher likelihood of EBV DNA positivity. The prevalence of EBV among PWH was significantly higher than among HIV-negative individuals. Higher HIV viral loads in PWH were associated with an increased risk of EBV DNA positivity. Since the increases in the viral load of EBV DNA among PWH could be related to the risk of developing EBV-associated cancers, it is necessary for more research on the role of EBV in EBV-associated cancer in this population group to be carried out