Virus Infection In Blood Donors Research Articles

THE ASSOCIATION BETWEEN HEPATITIS B VIRUS INFECTION WITH ABO AND RHD BLOOD GROUPS

Background: ABO and Rh blood types are associated with a higher risk of disease and are essential for clinical practice and blood transfusion safety. The findings of earlier research on the relationship between blood types and HBV infection are still up for debate. There is no study conducted on the study population to reveal the relationship between ABO and RhD blood groups and infection with hepatitis B virus. Aims: This study aimed to identify the relationship between blood types and hepatitis B virus infection in blood donors at Jiblah University Hospital in Jiblah town, Yemen Methods: A hospital-based cross-sectional study was conducted. Venous blood samples were drawn from 120 blood donors and tested for hepatitis B core antigen (anti-HBc) using commercial kits (Roche Diagnostics GmbH, United Kingdom). ABO and Rh blood groups were determined by the cell pooling method. The results were analyzed using SPSS v.20. Results: This study reported that the most frequent blood types were O positive and A positive 57 (47.5%) and 28 (23.3%) respectively, followed by B positive 14 (11.67%) and O negative 13 (10.83%). The overall phenotypic frequencies of ABO and RhD blood groups were O+>A+>B+>O->A->AB+>B->AB-. The prevalence of hepatitis B virus was 12 (10%). No statistical association was detected between ABO and RhD blood groups and hepatitis B infection. Conclusions: High prevalence rates of hepatitis B virus infection among blood donors were identified in this study. There was no statistical association between ABO and RhD blood groups and hepatitis B infection. Peer Review History: Received 25 March 2024; Revised 3 May 2024; Accepted 22 June; Available online 15 July 2024 Academic Editor: Prof. Cyprian Ogbonna ONYEJI, Obafemi Awolowo University, Ile-Ife, Nigeria, conyeji@oauife.edu.ng Average Peer review marks at initial stage: 6.0/10 Average Peer review marks at publication stage: 7.0/10 Reviewers: Dr. Leyla Açık, Gazi University, Ankara, Turkey, leylaacik@gmail.com Prof. Hassan A.H. Al-Shamahy, Sana'a University, Yemen, shmahe@yemen.net.ye

Comparative analysis of hepatitis B virus infections in blood donors born before and after the implementation of universal HBV vaccination in southern China.

In China, the vaccinated blood donors have rapidly increased by recent years, which may impact blood safety. The true prevalence of HBV between vaccinated blood donors and non-vaccinated blood donors should be explored. The samples of blood donors were collected and detected for serologic markers of HBV in the Shenzhen Blood Centre (SZBC). The discrepant results were tested with commercial electrochemiluminescence immunoassay (ELCI) for HBsAg, anti-HBs, HBeAg, Anti-HBe and Anti-HBc, alternative MPX ID NAT, nested PCR, and a quantitative real-time polymerase chain reaction (qPCR) assay for HBV DNA. The serological and molecular characteristics of HBV infected blood donors were analysed, and the effects on blood safety for donors born before and after the implementation of universal HBV vaccination were compared. Out of 242 presumed HBV infected donors from 26 318 donations, 131 (0.49%, [95% CI, 0.43-0.59]) chronic HBV infections (CHB, HBsAg detected with or without DNA), 58 (0.22%, [95% CI, 0.17-0.28]) occult hepatitis B infections (OBI, HBsAg not detected, assume anti-HBc positive and/or anti-HBs with HBV DNA) and 3 (0.011%, [95% CI, 0.0023-0.033]) window period (WP) infections were confirmed respectively. There were 28 CHBs (0.44%), 7 OBIs (0.11%) and 1 WP (0.016%) from vaccinated blood donor and 103 CHBs (0.52%), 51 OBIs (0.26%) and 2 WPs (0.01%) from non-vaccinated blood donor. The HBV+ (CHBs, OBIs and WPs) rate (0.56%) in vaccinated donors was lower than in non-vaccinated donors (0.78%, p < 0.05). The HBsAg titers of vaccinated infected blood donors (Median: 128.8IU/ml) were much higher than non-vaccinated infected blood donors (58.4IU/ml). The OBI yield rates in the vaccinated blood donors was significantly lower than the non-vaccinated blood donors (p < 0.05). There 102/124 (82.3%) samples were genotype B, 22/124 (17.7%) were genotype C respectively. There was no significant difference in the distribution of genotype between non-vaccinated blood donors (B/C, 86/17) and vaccinated blood donors (B/C, 23/6; p > 0.05). High frequency of vaccine escape mutations M133L (32.4%) and E164G in S region of genotype B strains and substitution L175S (40.9%) related to vaccine escape in S region of genotype C strains were identified. The universal HBV vaccination program markedly reduces the risk of HBV infection in blood donors, and provides a significant guarantee for the safety of blood transfusion. Several important mutations detected related vaccine escape and notable mutations needed further investigated.

Prevalence and risk factors for hepatitis E virus infection in blood donors: a nationwide survey in Italy, 2017 to 2019.

BackgroundIn high-income countries, hepatitis E virus (HEV) infection is mainly a zoonosis. However, it is also transfusion-transmissible and some countries, but not Italy, have introduced HEV screening for blood donations.AimWe assessed HEV infection prevalence and risk factors in a nationwide sample of Italian blood donors.MethodsWe selected 107 blood establishments (BE) distributed in the 20 Italian regions by a stratified two-stage design and invited them to participate in the study. Donors were tested for anti-HEV IgG and IgM and HEV RNA. Sociodemographic data and risk factors were collected through a questionnaire.ResultsOverall, 60 BE from 60 provinces in 19 Italian regions joined the study. We assessed HEV markers in 7,172 blood donors, of whom 6,235 completed the questionnaire. Overall crude and adjusted anti-HEV IgG prevalences were 8.3% and 5.5%, respectively. Overall anti-HEV IgM prevalence was 0.5%, while no blood donor was HEV RNA-positive. Anti-HEV IgG prevalence varied widely among regions (range: 1.3%–27.20%) and hyperendemic prevalences (> 40%) were detected in some provinces in two regions. Older age (AOR = 1.81; 95% CI: 1.36–2.41), foreign nationality (AOR = 2.77; 95% CI: 1.06–7.24), eating raw pork liver sausages (AOR = 2.23; 95% CI: 1.55–3.20) and raw homemade sausages (AOR = 3.63; 95% CI: 2.50–5.24) were independent infection predictors.ConclusionItalian blood donors showed a low to moderate HEV seroprevalence. High levels in some regions and/or provinces were mainly attributable to eating habits. Prevention should include avoiding consumption of raw or undercooked meat and safe production of commercial pork products.

Seroepidemiology and Risk Factors of West Nile Virus Infection in Blood Donors of Fars Province, Southwest of Iran

Aim: To evaluate the frequency of West Nile virus (WNV) in blood donors of the blood transfusion center of Fars province, Iran. Materials &amp; methods: A total of 337 participants referred for blood donation to Fars blood centers were included. The presence of anti-WNV antibodies was analyzed using the WNV IgG ELISA kit. Results: Out of all participants, 76 (22.6%) were positive for anti-WNV IgG antibodies. Our results also showed that the frequency of WNV was associated with the age, educational level, job and city of residency of participants (p &lt; 0.05). Conclusion: The results indicated the high frequency of WNV seropositivity among blood donors in southwest Iran. Accordingly, there is an urgent need to establish an integrated surveillance system for monitoring WNV infection in Iran.

Case-Control Study of Risk Factors for Acquired Hepatitis E Virus Infections in Blood Donors, United Kingdom, 2018-2019.

Hepatitis E virus (HEV) is the most common cause of acute viral hepatitis in England. Substantial yearly increases of autochthonous infections were observed during 2003–2016 and again during 2017–2019. Previous studies associated acute HEV cases with consumption of processed pork products, we investigated risk factors for autochthonous HEV infections in the blood donor population in England. Study participants were 117 HEV RNA–positive blood donors and 564 HEV RNA–negative blood donors. No persons with positive results were vegetarian; 97.4% of persons with positive results reported eating pork products. Consuming bacon (OR 3.0, 95% CI 1.7–5.5; p<0.0001), cured pork meats (OR 3.5, 95% CI 2.2–5.4; p<0.0001), and pigs’ liver (OR 2.9, 95% CI 1.0–8.3; p = 0.04) were significantly associated with HEV infection. Our findings confirm previous links to pork products and suggest that appropriate animal husbandry is essential to reduce the risk for HEV infection.

Risk factors associated with human immunodeficiency virus infection in blood donors in Iran: A case-control study.

BACKGROUND:Despite setting the stringent criteria for the selection of safe donors, some human immunodeficiency virus (HIV)-positive volunteers manage to give blood. Considering the window period of screening tests, this could endanger the safety of blood supply.MATERIALS AND METHODS:A frequency match case–control study was conducted on HIV-positive and negative blood donors in Iran from 2007 to 2008. Overall, 61 HIV-positive and 224 HIV-negative blood donors were selected as cases and controls, respectively. Two groups were matched for confounding factors. An identical questionnaire was used to assess risk factors. Univariate regression analysis for calculating crude odds ratio (OR) and 95% confidence interval (CI) was used for detecting eligibility of risk factors to enter the final model. The exposures with P < 0.1 were entered in the logistic regression model. Adjusted ORs with P < 0.05 and 95% CIs were reported for statistically significant variables.RESULTS:Significant effects were detected for the following variables: education, job, tattoo, intravenous (IV) drug abuse, imprisonment, and risky sexual behavior. However, based on multiple analyses, education, IV drug abuse, imprisonment, and risky sexual behavior remain significant.CONCLUSION:The majority of our findings are in parallel with the other studies performed in other countries. To increase blood safety, special attention should be paid to illiterate, first-time blood donors who are in the 25–40 age range. In addition, having the history of IV drug abuse, imprisonment and risky sexual behaviors put the blood donors more at risk of infecting HIV.

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Chikungunya Virus Infection in Blood Donors and Patients During Outbreak, Mandalay, Myanmar, 2019.

In 2019, an outbreak of chikungunya virus infection occurred in Mandalay, Myanmar, and 3.2% of blood donors and 20.5% of patients who were children were confirmed as being infected. The prevalence rate was up to 6.3% among blood donors. The East Central/South African genotype was predominantly circulating during this outbreak.

Comprehensive analysis of hepatitis B virus infections in blood donors in southern China that are surface antigen positive but nucleic acid testing negative

Hepatitis B virus (HBV) infection is one of the major concerns for the safety of blood transfusion in high-prevalent countries such as in China. Prior studies outside of China have shown hepatitis B surface antigen (HBsAg) false-reactive rate of 0.02% to 0.04%. Similarly, false-negative HBsAg and HBV DNA results may occur in infected donors. Our study analyzed HBsAg enzyme-linked immunosorbent assay (ELISA)-reactive but NAT-negative donations in Shenzhen Blood Center, China. HBsAg ELISA-positive/NAT-negative plasma samples identified from screening 101,025 donations during 2017-2018 were analyzed by molecular and serologic tests including neutralization, chemiluminescence immunoassays, and various HBV DNA amplification assays. Molecular characterizations of HBsAg-positive/NAT-negative samples were determined by quantitative polymerase chain reaction (qPCR) and nested PCR amplification of the basic core and precore promotor regions (295 base pairs) and HBsAg (S) region (496 base pairs). Screening of 101,025 eligible blood donations identified 157 (0.16%, 95% confidence interval, 0.13%-0.18%) HBsAg ELISA-positive/NAT-negative plasma samples; of those, 71 (45.2%) were HBsAg confirmed positive by further HBsAg testing and DNA positive by molecular tests with increased sensitivity. Of the 71, all but one was antibody to hepatitis B core antigen reactive without antibody to hepatitis B surface antigen, yielding one recent (window-period) HBV infection. Of the remaining donations, 80 (51%) were not considered as HBV-infected donors, and 6 (3.8%) were interpreted as indeterminate since HBsAg results were discordant with unconfirmed HBV DNA results. In the 71 confirmed positives, HBsAg levels ranged from 0.05 to 400 IU/mL and HBV DNA from 6 to 2654 IU/mL; however, the correlation between the two was weak (R2 = 0.24). Fewer than half of HBsAg ELISA-positive/NAT-negative samples were confirmed as HBsAg positive. Our study demonstrates that in highly HBV-endemic countries, assays with high sensitivity and specificity may be required.

Serological evidence of Mayaro virus infection in blood donors from São Carlos, São Paulo, Brazil.

Human infections by Mayaro virus (MAYV) occur by insect bites upon exposure to rural or sylvatic areas. Information regarding MAYV transmission is limited due to a lack of commercial diagnostic assays and diagnostic confusion on account of similarities of clinical signs with other co-circulating arboviral diseases. A serological survey of MAYV and Chikunguya virus (CHIKV) antibodies was performed by ELISA. Between 2017 and 2018, 5608 blood donor samples were tested. Specific IgM and IgG antibodies to MAYV were detected respectively in 36 and 11 samples, indicating a total seroprevalence of approximately 0.83%. Neutralization activity was observed in two IgG positive sera. Additionally, eight distinct samples had IgM antibodies to CHIKV alone. Our data suggest previously unreported circulation of MAYV in São Carlos city, from southeastern Brazil.

Seroprevalence and factors associated with hepatitis B virus infection in blood donors in Ethiopia: a systematic review and meta-analysis

Hepatitis B virus (HBV) can be transmitted during blood donation. This study estimated the pooled prevalence of hepatitis B and associated risk factors in blood donors in Ethiopia. The study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. PubMed, African Journals Online (AJOL), the Excerpta Medica database (EMBASE), SCOPUS, Web of Science, Google Scholar, and JSTOR were accessed. Articles were searched from the Addis Ababa University research repository. The core search terms and phrases were "Hepatitis", "Hepatitis B", "Blood Donation", "Blood Donor", "Transfusion", "Transfusion Transmissible Infections", "Ethiopia", "Addis Ababa", "Adama", "Bahirdar", "Dire Dawa", "Gondar", "Mekelle", "Hawassa". The data were analyzed based on a DerSimonian-Laird random-effects model using STATA 14 and Review Manager version 5.3. I2 was used to quantify between-study heterogeneity. Leave-one-out sensitivity analysis was done. Twenty-seven articles with 308,188 samples were included in the meta-analysis. The studies used HBsAg to diagnose hepatitis B. The pooled prevalence of HBV infection among blood donors was 4.91% (95% CI: 4.21-5.60; I2 = 99%). Male sex (p < 0.001), replacement donors (p = 0.007), history of tooth extraction (p < 0.001), and sharp material sharing (p < 0.001) were associated with increased risk, while being a repetitive blood donor was associated with a decreased risk of being infected with HBV (p = 0.02).

Consecutive reactive results in screening of transfusion transmitted infections: Family history of blood donors is also important

BackgroundEnzyme linked immunosorbent assay (ELISA) test is used for screening of transfusion transmitted infections (TTI) in blood donors. Consecutive reactive results in ELISA is due to sample/reagent carryover or donor related. In this study we tried to find out the possibilities of family history/close contacts with patients of hepatitis among these consecutive reactive donors. AimTo analyze the consecutive reactive results in ELISA tests for TTI testing on samples of healthy blood donors. Material and methodsA retrospective observational study was conducted from January 2016 to July 2018 in a tertiary care hospital, North India. Consecutive reactive results by fourth generation ELISA for TTIs screening were evaluated for possible reasons. Confirmation tests were not done. Reactive donors were contacted telephonically for relevant history of close contact with infected personnel. ResultsOut of 53,740 donations 1,061 were reactive for TTIs during our study period. Prevalence of Hepatitis B (HBV), Human Immunodeficiency (HIV) and Hepatitis C (HCV) virus infection in blood donors were 1.27%, 0.20% and 0.50% respectively. Consecutive reactive results for HBV were 9.20% (63/685), for HCV 6.0% (16/266) and nil for HIV. There was no sample carryover in this. Out of 79 consecutive reactive donors 69 donated for same patients and 32 were related with infected patient which are statistically significant (p < 0.0001). DiscussionThis study recommends that in analysis of consecutive positive results in ELISA along with looking for procedure/sample error, there is also a need to take retrospective history of donors for close contact with infected patients.

Hepatitis E Virus Infection in Blood Donors and Risk to Patients in the United States and Canada.

Hepatitis E virus (HEV) is the most common cause of acute hepatitis worldwide including large water-borne outbreaks, zoonotic infections and transfusion transmissions. Several countries have initiated or are considering blood donor screening in response to high HEV-RNA donation prevalence leading to transfusion-transmission risk. Because HEV transmission is more common through food sources, the efficacy of blood donor screening alone may be limited. HEV-nucleic acids in 101 489 blood donations in the United States and Canada were studied. A risk-based decision-making framework was used to evaluate the quantitative risks and cost-benefit of HEV-blood donation screening in Canada comparing three scenarios: no screening, screening blood for all transfused patients or screening blood for only those at greatest risk. HEV-RNA prevalence in the United States was one per 16 908 (95% confidence interval [CI], 1:5786-1:81987), whereas Canadian HEV-RNA prevalence was one per 4615 (95% CI, 1:2579-1:9244). Although 4-fold greater, Canadian HEV-RNA prevalence was not significantly higher than in the United States. Viral loads ranged from 20 to 3080 international units per mL; all successfully typed infections were genotype 3. No HEV-RNA false-positive donations were identified for 100 percent specificity. Without donation screening, heart and lung transplant recipients had the greatest HEV-infection risk (1:366962) versus kidney transplant recipients with the lowest (1:2.8 million) at costs of $225 546 to $561 810 per quality-adjusted life-year (QALY) gained for partial or universal screening, respectively. Higher cost per QALY would be expected in the United States. Thus, HEV prevalence in North America is lower than in countries performing blood donation screening, and if implemented, is projected to be costly under any scenario.

Risk of Zika virus transmission by blood donations in Brazil

BackgroundZika, a disease caused by Zika virus infections, has recently emerged and caused outbreaks in many parts of the world. The clinical manifestations of Zika are usually mild, mostly presenting as an exanthematic febrile disease, but on some occasions, it might be associated with microcephaly after intrauterine infection, and Guillain-Barré Syndrome. Zika virus is primarily transmitted by mosquito bites, but other means of transmission have been described, and potential risk for blood transmission has been reported in French Polynesia and Brazil. MethodsTo investigate the risk of Zika virus infection after a blood transfusion in an area of Brazil where a possible transmission by a platelet concentrate has been described. Using a mini-pool format, 1857 blood donations were evaluated by real-time reverse transcriptase polymerase chain reaction designed to detect Zika virus RNA. ResultsAfter testing samples individually from positive mini-pools, the prevalence of Zika virus RNA was only 0.16%, a result probably associated to the low circulation of this virus in the study area. In addition, it was evident that the implementation of post-surveillance programs is important to detect Zika virus infections in blood donors, as the post-donation surveillance program detected two blood donors with the disease in this study. ConclusionThis study shows that the risk for Zika virus transmission by blood transfusion is real, even in regions with a low circulation of the disease, but the combination of the detection of Zika virus RNA by polymerase chain reaction and post-donation surveillance might reduce the risk of transmission by blood transfusions.

The Brazilian experience of nucleic acid testing to detect human immunodeficiency virus, hepatitisC virus, and hepatitisB virus infections in blood donors.

The history of the development and implementation of the Brazilian nucleic acid testing (NAT) platform to detect and discriminate among human immunodeficiency virus (HIV), hepatitis C virus (HCV), and hepatitis B virus (HBV) infections in blood donors is described here. The results for the sensitivity, reproducibility, and NAT yield of the platform since program implementation are provided. The Brazilian NAT HIV, HCV, and HBV kit was developed and evaluated with regard to analytical sensitivity, specificity, intralot and interlot reproducibility, interfering substances, and genotype and diagnostic sensitivity. Additionally, a sample of identified NAT-yield cases was characterized with regard to viral load. The 95% limits of detection for HIV, HCV, and HBV were 68.02, 102.35, and 9.08 IU/mL, respectively. All replicates were detected with reproducibility assays between the acceptable values. A total of 13,610,536 blood donors was screened from 2010 to 2016, and 63 HIV-yield cases and 28 HCV-yield cases were detected. Among 5,795,424 blood donors screened for HBV from 2014 to 2016, 42 yield cases were found. The Brazilian NAT HIV, HCV, and HBV kit is an automated NAT system suitable for routine blood donor screening in a completely traceable process. The analytical sensitivity as well as the diagnostic sensitivity fulfilled all requirements set by the health ministry for blood donor screening. A significant number of transmission cases were prevented by the implementation of this important program.

WITHDRAWN: Comparison of electrochemiluminescence and enzyme-linked immunosorbent assay methods used in the diagnosis of human immunodeficiency virus, hepatitis B virus and hepatitis C virus infections in blood donors in Libreville (Gabon)

Abstract Safe blood transfusion remains a health-related challenge in Sub-Saharan Africa. High prevalence of blood-borne infectious agents, lack of financial resources, well trained personnel are some of the root causes to not efficiently reduce the rate of post-transfusion transmission of human immunodeficiency virus (HIV), hepatitis B and C viruses (HBV and HCV). Objective This report sought to assess the performances of Cobas 6000 e601 and EVOLIS BIORAD in the detection of HIV, HBV and HCV in blood donors in Libreville (Gabon). Methods A cross-sectional investigation was conducted in July 2017 in a group of 2,000 blood donors recruited at the National Blood transfusion Center (NBTC), Libreville Gabon. Of them, 363 donors were selected to compare the performances of COBAS 6000 e601 (electro-chemiluminescence) and EVOLIS BioRad in detecting HIV, HBV and HCV using Cohen’s kappa coefficient. Results Both methods yielded similar results for the detection of HIV and HBsAg. Indeed, a very good agreement of 93.39% and an excellent agreement of 98.90% were obtained for the detection of HIV and HbsAg, respectively, with kappa values of 0.80 and 0.98. The observed agreement of 91.86% was found for the detection of HC, which gave a fair agreement between the two methods with kappa=0.33. Conclusion The two evaluated methods of detection showed a similar performance in the detection of HIV, HBV. However, given the high rate of intra and inter-genotypes recombination known for HIV and HBV more robust technique of detection such as polymerase chain reaction should be used to prevent post-transfusion contaminations.

Prevalence, incidence, and risk factors of human immunodeficiency virus infection in blood donors in the Southeastern United States.

Human immunodeficiency virus (HIV)-positive blood donors pose a risk to blood safety. The Southeastern United States has the highest reported HIV infection rates. Here we calculate HIV prevalence, incidence, and residual risk in Southeastern US blood donors and report risk factors disclosed by incident donors in counseling sessions. American Red Cross donation and testing data from 2009 to 2014 for three Southeastern collection regions were used to calculate HIV prevalence, incidence, and residual risk. Incident donors had a previous HIV-negative donation within 730 days of their positive donation. Residual risk was defined as the window period multiplied by incidence. From 2009 to 2014, a total of 236 HIV-positive donors occurred in these regions for an overall prevalence of 8.3 per 100,000 donations. There were 56 incident donors over the 6-year period with incidence decreasing from 7.1 per 100,000 person-years (PYs) in the first two years (2009-2010) to 3.5 in the last two years (2013-2014). Residual risk decreased from 1 in 562,000 to 1 in 1,100,000. The most commonly reported risk factor behavior in male incident donors was men who have sex with men; females expressed no predominant risk factor. HIV prevalence and incidence among blood donors in the southeast are higher than other US regions, consistent with general public health surveillance. However, the overall residual risk estimates are low at less than 1 per million. Ongoing monitoring of the blood supply along with educational efforts to provide infected individuals with alternatives to donation remain important initiatives.

Hepatitis B virus infection in blood donors in Argentina: prevalence of infection, genotype distribution and frequency of occult HBV infection.

This study describes the prevalence of HBV infection based on detection of HBsAg and HBV-DNA by NAT in 70,102 blood donors in Argentina (Córdoba province) and shows the viral genotype distribution and frequency of occult HBV infection (OBI) in this population. Forty-two donors were confirmed positive for HBV infection (0.06%), and four had OBI. Genotype F was the most prevalent (71.4%), followed by A (14.3%), C (7.1%) and D (7.1%). This is the first report of the prevalence of confirmed HBV infection and the high frequency of occult HBV infection in a blood bank in Argentina.

High Seroprevalence of Dengue Virus Infection in Blood Donors From Delhi: A Single Centre Study.

The risk of transfusion transmitted dengue has been increasingly recognized. Blood donors in an endemic area like Delhi may serve as a potential vehicle for transmission of the infection. Moreover, prevalence of infection in them would be representative of the true picture of dengue in a population. To determine the prevalence of dengue virus infection in blood donors in a tertiary care centre. A total of 200 blood donors were recruited in the study after obtaining informed consent in the Institute of Liver and Biliary Sciences, New Delhi in July and August 2012. Data regarding clinical and demographic characteristics was collected using a preformed questionnaire. Blood samples obtained were subjected to anti-dengue IgM and IgG ELISA as well as semi-nested Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) for dengue RNA. Of the study subjects, most were men (97%) with a median age of 28 years (range 19-51 years). Anti-dengue IgG was positive in 116 cases (58%) while IgM was seen in 27cases (13.5%). Of them, in 25 (12.5%) cases both IgG and IgM were positive, while only two (1%) cases tested positive for IgM alone. None of the blood donors were found to be viremic on screening using Nested RT-PCR. A clear increase of IgG seroprevalence with age was evident. No difference in the seroprevalence rates in urban vs. rural areas was seen. High seroprevalence of dengue infection was seen in healthy asymptomatic blood donors. Though evidence of acute infection was found in some, none were found to be viremic. Larger studies are required to quantify the risk and provide strong evidence for policies to be made.

PREVALENCE OF HEPATITIS B VIRUS IN BLOOD DONORS AT DA NANG HOSPITAL C IN 2014

Objectives: Study on prevalence of hepatitis B virus in blood donors at Hospital C Danang to determine the percentage of HBsAg-positive in blood donors and identify some risk factors related to hepatitis B virus infection in blood donors. Material and methods: Samples of blood of donors were HBsAg testing by ELISA, the research conducted by descriptive cross-sectional design. The results and conclusions are as follows: Results: HBsAg positive rate was 10.6% (35/330), which accounted for 14.7% males and 7.5% females. HBsAg positive rate high percentage of first-time blood donor group (15.2%), very low proportion of repeat blood donor group (0.9%). Conclusion: HBsAg positive is according to the risk factors for hepatitis B virus transmission associated with surgery, acupuncture, tattooing, infusion, injection, dental treatment, skin sewing and manicure, not associated with history of blood transfusion and endoscopy. Key words: HBsAg, blood donors, HBV.