Real-world utility of serological tests in patients with suspected scrub typhus in the Republic of Korea:A single-center,retrospective,observational study

Objective:Serological tests are widely used for scrub typhus diagnosis;however,their limitations are evident.This study aims to assess their practical value in clinical settings.Methods:We analyzed the data of adult patients with suspected scrub typhus who visited a tertiary care hospital in the Republic of Korea from September to December from 2019 to 2021.The included patients had an acute fever and at least one of the following ten secondary findings:myalgia,skin rash,eschar,headache,thrombocytopenia,increased liver enzyme levels,lymphadenopathy,hepatomegaly,splenomegaly,and pleural effusion.The diagnoses were grouped as scrub typhus or other diseases by two infectious disease physicians.Results:Among 136 patients who met the eligibility criteria,109 had scrub typhus and 27 had different diseases.Single and paired total antibodies using immunofluorescence assay(IFA),and total antibodies using immunochromatography-based rapid diagnostic testing(ICT)were measured in 98%,22%,and 75%of all patients,respectively.Confirmation using paired samples for scrub typhus was established at a median of 11[interquartile range(IQR)10-16]days following the first visit.Among the 82 admitted patients,the median admission time was 9(IQR 7-13)days.According to IFA,58(55%)patients with scrub typhus had total immunoglobulin titers≥1:320,while 23(85%)patients with other disease had titers<1:320.Positive ICT results were observed in 64(74%)patients with scrub typhus and 10(67%)patients with other diseases showed negative ICT results.Conclusions:Serological testing for scrub typhus is currently insufficient for decision-making in clinical practice.

Serological Investigation into the Infected Genotypes of Patients with Japanese Encephalitis in the Coastal Provinces of China

Objective Genotypes(G)1,3,and 5 of the Japanese encephalitis virus(JEV)have been isolated in China,but the dominant genotype circulating in Chinese coastal areas remains unknown.We searched for G5 JEV-infected cases and attempted to elucidate which JEV genotype was most closely related to human Japanese encephalitis(JE)in the coastal provinces of China.Methods In this study,we collected serum specimens from patients with JE in three coastal provinces of China(Guangdong,Zhejiang,and Shandong)from 2018 to 2020 and conducted JEV cross-neutralization tests against G1,G3,and G5.Results Acute serum specimens from clinically reported JE cases were obtained for laboratory confirmation from hospitals in Shandong(92 patients),Zhejiang(192 patients),and Guangdong(77 patients),China,from 2018 to 2020.Seventy of the 361 serum specimens were laboratory-confirmed to be infected with JEV.Two cases were confirmed to be infected with G1 JEV,32 with G3 JEV,and two with G5 JEV.Conclusion G3 was the primary infection genotype among JE cases with a definite infection genotype,and the infection caused by G5 JEV was confirmed serologically in China.

Study on the Application Value of Liver Function and Serological Index Levels in the Diagnosis of Fatty Liver

Objective:To explore the application value of liver function and serological index detection in diagnosing fatty liver.Methods:Ninety patients with fatty liver disease(disease group)and ninety healthy subjects(healthy group)were selected as the subjects of this study.They all underwent liver function index testing and serological index testing.Test results were compared,and the diagnostic accuracy of single and combined tests was evaluated.Results:Liver function indicators of patients in the disease group were higher than those in the healthy group,with severe patients exhibiting higher levels than moderate patients and mild patients(P<0.05).Serological indicators in patients in the disease group were higher than those in the healthy group,with severe patients showing higher levels than moderate patients and mild patients(P<0.05).The diagnostic accuracy of liver function index testing was higher than that of serological index testing,and the accuracy of combined testing was higher than that of single testing(P<0.05).Conclusion:In diagnosing fatty liver,combining liver function testing and serological testing enables the initial diagnosis of the disease and facilitates the accurate assessment of its severity.

Correction to“Performance of a serological IgM and IgG qualitative test for COVID-19 diagnosis:An experimental study in Brazil”

Correction to“Freire de Melo F,Martins Oliveira Diniz L,Nélio Januário J,Fernando Gonçalves Ferreira J,Dórea RSDM,de Brito BB,Marques HS,Lemos FFB,Silva Luz M,Rocha Pinheiro SL,de Magalhães Queiroz DM.Performance of a serological IgM and IgG qualitative test for COVID-19 diagnosis:An experimental study in Brazil.World J Exp Med 2022;12(5):100-103[PMID:36196438 DOI:10.5493/wjem.v12.i5.100]”.In this article,we identified an issue with the“Acknowledgments”section.Here,we then provide a recognition section for our supporting institutions.

Serological survey on canine coronavirus antibodies in giant pandas by virus neutralization test

In order to survey the infectious situation of canine coronavirus (CCV) in giant panda population, a virus neutralization test detecting specific antibodies against CCV in giant panda抯 sera was established by using two-fold dilutions of serum and 100 TCID50 of the virus. The 62 sera samples of giant pandas, which were gathered from zoos and reserve region of Sichuan Province, China were detected. The neutralization antibody titer of 1:4 was recognized as the positive criterion, 8 sera samples were detected to be positive, and the positive rate was 12.9%. The titers of neutralizing antibody ranged from 1:8 to 1:32. It was the first comprehensive investigation on neutralization antibodies against CCV in giant panda population in China. The results of study showed that the infection of CCV in giant panda population was universal, which has posed a threat to the health of giant panda. Therefore, it is incumbent on us to study safe and effective vaccines to protect giant panda against CCV infection.

Serological Investigation on Mycoplasma Oviovipneumoniae in Qinghai Province

[ Objective] To investigate the prevalence of Mycoplasma oviovipneurnoniae in Qinghai Province. [ Method] With positive indirect hemagglutination test kit for detecting antibodies against Mycoplasma oviovipneumoniae, 965 sheep sera and 208 goat sera were collected in Qinghai Province from 2006 to 2008 and detected. [ Result ] The positive rate of sheep sera and goat sera was 30.4% and 19.7%, respectively. The posi- tive rate of sheep sera collected from different regions ranged from 19.7% to 40.2%, and that of goat sere ranged from 6.6% to 22.2%. In addition, the incidence in winter and spring was higher than that in summer and autumn. [ Conclusion ] The infection rate of Mycoplasrna ovipneumoniae should be higher in Qinghai region than in other western regions, so it is necessary to strengthen the prevention and control of this disease.

Evaluation of elastography combined with serological indexes for hepatic fibrosis in patients with chronic hepatitis B

AIM To investigate the value of ultrasound elastography combined with serological indexes in diagnosing liver fibrosis and assessing its severity.METHODS A total of 338 chronic hepatitis B(CHB) patients were divided into a disease group(patients with hepatic fibrosis) and control group(subjects without hepatic fibrosis). The disease group was further divided into S1-S4 according to the degree of fibrosis. Independent risk factors for hepatic fibrosis were analyzed using multivariate logistic regression. The diagnostic values of hepatic fibrosis from different indicators were compared using receiver operating characteristic(ROC) curves. The combination of elastography and serological indexes was explored to assess the severity of hepatic fibrosis.RESULTS The multivariate logistic regression analysis results revealed that shear wave velocity(SWV), hyaluronic acid(HA), type Ⅳ collagen(CⅣ) and aspartate aminotransferase-to-platelet ratio index(APRI) significantly affected the occurrence of hepatic fibrosis. The ROC curve revealed that the accuracy of the diagnosis of hepatic fibrosis for SWV and HA were 87.3% and 84.8%, respectively. The accuracy of SWV combined with HA was 88.9%. The multiple linear regression analysis revealed that SWV, aspartate aminotransferase(AST)/alanine aminotransferase(ALT), HA, CⅣ, APRI and fibrosis index based on the 4 factor(FIB-4) were screened as statistically significant independent factors. The established regression equation was: Fibrosis level =-4.046 + 1.024 × SWV + 1.170 × AST/ALT + 0.011 × HA + 0.020 × CⅣ + 0.719 × APRI + 0.379 × FIB-4. CONCLUSION SWV combined with serological indexes can improve the accuracy of diagnosis for CHB hepatic fibrosis. Serum indexes can help diagnose the degree of hepatic fibrosis.

Monoclonal antibody-based serological detection of Citrus yellow vein clearing virus in citrus groves

Citrus yellow vein clearing virus （CYVCV） is considered as the causal agent of Citrus yellow vein clearing disease and belongs to the genus Mandarivirus in the family Alphaflexiviridae. Capsid protein （CP） of CYVCV Chongqing isolate （CYVCV- CQ） was produced using a prokaryotic expression system and used as the immunogen for monoclonal antibody （MAb） production. Four highly specific and sensitive murine MAbs and one polyclonal antibody were prepared in this study. Titers of the four MAbs in ascites fluids ranged from 10-6 to 10-7 as determined by indirect enzyme-linked immunosorbent assay （ELISA）. Three serological assays, including dot enzyme-linked immunosorbent assay （dot-ELISA）, tissue blot-ELISA, and double-antibody sandwich （DAS）-ELISA, were developed for quick and reliable detections of CYVCV in citrus samples. The developed dot-ELISA and DAS-ELISA methods could detect CYVCV in the infected citrus leaf crude extracts diluted at 1：2 560 and 1：10 240 （w/v, g mL^-1）, respectively. The detection result of 125 citrus leaf samples collected from citrus groves in Yunnan Province and Chongqing Municipality of China showed that approximately 36% samples were positive for CYVCV. This virus was, however, not＇detected in any sample collected from Zhejiang or Jiangxi Province, China.

Relationship between Maternal PBMC HBV cccDNA and HBV Serological Markers and its Effect on HBV Intrauterine Transmission

Objective To investigate the relationship between maternal peripheral blood mononuclear cells (PBMC) hepatitis B virus(HBV) covalenty closed circular deoxyribonucleic acid(cccDNA) and other HBV serological markers and its effects on HBV intrauterine transmission. Methods We enrolled 290 newborns and their hepatitis B surface antigen(HBsAg) positive mothers. HBV cccDNA in PBMC and HBV DNA in serum were detected by a real‐time PCR‐TaqM an probe while HBV serological markers were detected with an electrochemiluminescence immunoassay. Results There was a positive correlation between the levels of PBMC HBV cccD NA and serum HBV DNA and HBeA g(r = 0.436 and 0.403, P < 0.001). The detection rate of pattern A [‘HBsA g(+), HBeA g(+), and anti‐HBc(+)’] was significantly higher in the PBMC HBV cccD NA positive group than in the control group(χ^2 = 48.48, P < 0.001). There was a significant association between HBV intrauterine transmission and PBMC HBV cccD NA(χ^2 = 9.28, P = 0.002). In the presence of serum HBV DNA, HBeA g, and PBMC HBV cccD NA, the risk of HBV intrauterine transmission was three times higher(OR = 3.69, 95% CI: 1.30‐10.42) than that observed in their absence. The risk of HBV intrauterine transmission was the greatest(OR = 5.89, 95% CI: 2.35‐14.72) when both PBMC HBV cccD NA and pattern A were present. A Bayesian network model showed that maternal PBMC HBV cccD NA was directly related to HBV intrauterine transmission. Conclusion PBMC HBV cccDNA may be a direct risk factor for HBV intrauterine transmission. Our study suggests that serological markers could be combined with PBMC‐related markers in prenatal testing.

Serological diagnosis of Epstein-Barr virus infection: Problems and solutions

Serological tests for antibodies specific for Epstein-Barr virus(EBV) antigens are frequently used to define infection status and for the differential diagnosis of other pathogens responsible for mononucleosis syndrome. Using only three parameters [viral capsid antigen(VCA) Ig G, VCA Ig M and EBV nuclear antigen(EBNA)-1 Ig G],it is normally possible to distinguish acute from past infection: the presence of VCA Ig M and VCA Ig G without EBNA-1 Ig G indicates acute infection, whereas the presence of VCA Ig G and EBNA-1 Ig G without VCA Ig M is typical of past infection. However, serological findings may sometimes be difficult to interpret as VCA Ig G can be present without VCA Ig M or EBNA-1 Ig G in cases of acute or past infection, or all the three parameters may be detected simultaneously in the case of recent infection or during the course of reactivation. A profile of isolated EBNA-1 Ig G may also create some doubts. In order to interpret these patterns correctly, it is necessary to determine Ig G avidity, identify anti-EBV Ig G and Ig M antibodies by immunoblotting, and look for heterophile antibodies, anti-EA(D) antibodies or viral genome using molecular biology methods. These tests make it possible to define the status of the infection and solve any problems that may arise in routine laboratory practice.

Nested case-control study of multiple serological indexes and Brighton pediatric early warming score in predicting death of children with sepsis

BACKGROUND Currently, it is difficult to predict the complications of children at the early stage of sepsis. Brighton pediatric early warning score(PEWS) is a disease risk assessment system that is simple and easy to operate, which has good sensitivity and specificity in disease recognition among children. Because detection indicators vary widely in children, a single indicator is difficult to assess the posttreatment status of children with sepsis.AIM To investigate the relationship between serological markers, Brighton PEWS, and death in children with sepsis after treatment.METHODS A total of 205 children diagnosed with sepsis at our hospital were enrolled. The baseline data, serum scores, and PEWS scores were recorded. In the nested casecontrol study, children who died during the study period were included in an observation group. According to the matching principle, the children who were not dead in the same cohort were included in a control group. The influencing factors of death in children with sepsis after treatment and the value of each evaluation index in predicting the prognosis of children were analyzed.RESULTS A total of 96 children were enrolled in the study, including 48 each in the observation group and the control group. Multivariate logistic regression analysis indicated that antibacterial treatments within 1 h(P = 0.017), shock(P = 0.044),multiple organ dysfunction syndrome(MODS)(P = 0.027), serum procalcitonin(PCT)(P = 0.047), serum albumin(ALB)(P = 0.024), and PEWS(P = 0.012) were independent risk factors for the death of children with sepsis. The area under the curve of the combination of ALB, PCT, and PEWS to predict the death in children with sepsis was the highest(0.908).CONCLUSION Antibacterial treatments within 1 h, shock, MODS, PCT, ALB, and PEWS are independent risk factors for the death of children with sepsis. The predictive accuracy of the combination of PCT, ALB, and PEWS for the prognosis of children with sepsis is the best.

Identification of an H1N1 subtype of swine influenza virus and serological analysis

To investigate the epizootic of swine influenza virus(SIV),60 nasal swabs were collected from a clinical cases of pig farm in Tai’an City,Shandong Province of China in April 2017.SIV was isolated by inoculating into 10-day-old Special Pathogen Free embryonated eggs and the whole genome was sequenced.An H1N1 subtype SIV was isolated and designated as A/swine/Shandong/TA04/2017(H1N1).Phylogenetic analysis showed that apart from the polymerase A(PA) fragment belonging to the 2009 pandemic H1N1 branch,seven genome segments belonged to avian-like H1N1 influenza virus lineage.The cleavage site sequence of the hemagglutinin(HA) protein was PSIQSR↓G,which is a typical molecular biological characteristic.Five potential N-glycosylation sites(N14,N26,N277,N484 and N543) were found in the HA gene.To further investigate the epidemiology of SIV in this farm,the 995 serum samples were assessed with EAH1N1 2009 pandemic H1N1 and H3 N2 antigens.The results showed that the total positive rate was 65.43%.The positive rates of single virus infection detected by EAH1N1,2009 pdmH1N1 and H3 N2 for serum HI(Hemagglutination inhibition) were 48.35,30.85 and 7.47%,respectively.The results showed that SIV in Shandong Province has been reassorted in some segments and the SIV-positive rate was high on the SIV outbreak farm.These data provide evidence of an epizootic of SIV.

Serological investigation of vector-borne disease in dogs from rural areas of China

Objective:To evaluate the Anaplasma phagocytophilum(A.phagocytophilum),Ehrlichia canis(E.canis,Dirofilaria immitis(D.immitis)(canine heartworm),Borrelia burgdorferi(B.burgdorferi)infections in countryside dogs from Yunnan,Hainan and Anhui provinces.Methods:Serum samples were collected from 26 dogs in Yunnan.Hainan and Anhui provinces.The samples were tested using a commercial ELISA rapid diagnostic assay kit(SNAP^(?)4Dx^(?);IDEXX Laboratories,Inc.U.S.A.).Meaiiwliile,indirect immunofluorescence assay(IFA)recommended by WHO was conducted to delect IgG to A.phagocytophilum.Two methods were analyzed and compared.Results:The number of serologically positive dogs for IgG to A.phagocytophilum was only 2which was from Hainan province and none of the 26 dogs responded positive for E.canu.D.immitis(canine heartworm,and B.burgdorferi by ELISA rapid diagnostic method.The number of serologically positive dogs for IgG to A.phagocytophilum was 13(50%)by IFA method.Data of the two methods were analyzed by statistical software and the difference was statistically significant(P=0.002).Conclusions:It can be concluded that IFA method was more sensitive than ELISA rapid diagnostic method.However,we need conduct further and intensive epidemiology survey on tick-born diseases pathogens including.4.phagocytophilum,E.canis,D.immitis(canine heartworm),and B.burgdorferi which have public health significance.

Utility of serological markers in inflammatory bowel diseases: Gadget or magic?

The panel of serologic markers for inflammatory bowel diseases （IBD） is rapidly expanding. Although antiSaccharornyces cerev/siae antibodies （ASCA） and atypical perinuclear antineutrophil cytoplasmic antibodies （P-ANCA） remain the most widely investigated, an increasing amount of experimental data is available on newly discovered antibodies directed against various microbial antigens. The role of the assessment of various antibodies in the current IBD diagnostic algorithm is often questionable due to their limited sensitivity. In contrast, the association of serologic markers with disease behavior and phenotype is becoming increasingly well-established. An increasing number of observations confirms that patients with Crohn＇s disease expressing multiple serologic markers at high titers are more likely to have complicated small bowel disease （e.g. stricture and/or perforation） and are at higher risk for surgery than those without, or with low titers of antibodies. Creating homogenous disease sub-groups based on serologic response may help develop more standardized therapeutic approaches and may help in a better understanding of the pathomechanism of IBD. Further prospective clinical studies are needed to establish the clinical role of serologic tests in IBD.

Serological Survey of Zika Virus in Humans and Animals in Dejiang Prefecture, Guizhou Province,China

Objective The current outbreak of Zika virus(ZIKV)poses a severe threat to human health.Two ZIKV strains were isolated from mosquitoes collected from the Dejiang prefecture in China in 2016,which was the first isolation of ZIKV in nature in China.Methods In this study,serum samples were collected from 366 healthy individuals and 104 animals from Dejiang prefecture in 2017,and the plaque reduction neutralization test(PRNT)was used to evaluate the seroprevalence of ZIKV.Results None of the 366 residents from whom the samples were collected were seropositive for ZIKV.None of the 11 pigs from whom the samples were collected were seropositive for ZIKV,while 1 of 63(1.59%)chickens and 2 of 30(6.67%)sheep were seropositive for ZIKV.Conclusions The extremely low seropositivity rate of ZIKV antibodies in animals in the Dejiang prefecture,Guizhou province in this study indicates that ZIKV can infect animals;however,there is a low risk of ZIKV circulating in the local population.

A Virus-type Specific Serological Diagnosis of Flavivirus Infection Using Virus-like Particles

Many flaviviruses are emerging and reemerging pathogens, such as West Nile virus （WNV）, dengue virus （DENV）, yellow fever virus （YFV）, and Japanese encephalitis virus. Serological assay is the dominant method for diagnosis of flavivirus infections in human. Because antibodies generated during flavivirus infections cross-react with other flavivirus members, plaque reduction neutralization test （PRNT） is the only available assay to determine the infecting flavivirus type. Since PRNT requires culturing raw viruses, it must be performed in biosafety levet-3 or level-4 containment for many flaviviruses, and takes more than ten days to complete. To overcome these problems, we have developed flavivirus viral-like particles （VLPs） that could be used to replace raw viruses in the neutralization assay. The VLPs were prepared by trans packaging a luciferase-reporting replicon with viral structural proteins. This novel assay involves three simple steps： （i） VLPs from a panel of flaviviruses are incubated with flavivirus-infected sera at 37℃ for 1 h; （ii）the neutralized VLPs are used to infect Vero cells; and （iii） the infected cells are measured for luciferase activities at 22 h post-infection. The virus type whose VLP is most efficiently neutralized by the serum specimen （as quantified by the luciferase activities） is the etiologic agent. As a proof-of-concept, we show that a WNV-infected mouse serum neutralized the WNV VLP more efficiently and selectively than the DENV and YFV VLPs. Our results demonstrate that the VLP neutralization assay maintains the ＂gold standard＂ of the classic PRNT; importantly, it shortens the assay time from 〉10 days to 〈1 day, and can be performed in biosafety level-2 facility.

Comparison of Blood Group Molecular Genotyping to Traditional Serological Phenotyping in Patients with Chronic or Recent Blood Transfusion

Objectives: Accurately identifying the Antigens (Ags) on recipient red blood cells (RBCs) is critical in prevention of RBC alloimmunization in chronically transfused patients. The goal of this study was to compare RBC molecular genotyping to serological phenotyping in those patients. Methods: Serological phenotyping and molecular genotyping methods were used to study blood samples from 18 healthy blood donors and 16 transfused patients. Reticulocyte harvesting or hypotonic cell separation was added to recheck RBC phenotypes of the patients with discrepancies between phenotyping and genotyping. Results: No discrepancies were found between the two genotyping methods in all the donors and patients. 1 of 9 sickle-cell disease (SCD) patients and all 3 thalassemia patients demonstrated discrepancies in multiple blood groups between phenotyping and genotyping, which were not corrected by reticulocyte harvesting or hypotonic cell separation. Conclusions: These findings suggest that RBC molecular genotyping is superior to serological phenotyping in chronically transfused SCD or thalassemia patients.

Monoclonal antibody-based serological detection of potato virus M in potato plants and tubers

Potato virus M(PVM) is one of the common and economically important potato viruses in potato-growing regions worldwide. To investigate and control this viral disease, efficient and specific detection techniques are needed. In this study, PVM virions were purified from infected potato plants and used as the immunogen to produce hybridomas secreting PVM-specific monoclonal antibodies(MAbs). Four highly specific and sensitive murine MAbs, i.e., 1 E1, 2 A5, 8 A1 and 17 G8 were prepared through a conventional hybridoma technology. Using these four MAbs, we have developed an antigen-coated plate(ACP)-ELISA, a dot-ELISA and a Tissue print-ELISA for detecting PVM infection in potato plants and tubers. PVM could be detected in infected potato plant tissue crude extracts diluted at 1:10 240(w/v, g mL^(–1)) by the dot-ELISA or at 1:163 840(w/v, g mL^(–1)) by the ACP-ELISA. The Tissue print-ELISA is the quickest and easiest assay among the three established serological assays and is more suitable for onsite large-scale sample detection. Detection results of the field-collected samples showed that PVM is currently widespread in the Yunnan and the Heilongjiang provinces in China. The field sample test results of the developed serological assays were supported by the results from RT-PCR and DNA sequencing. We consider that the newly established ACP-ELISA, dot-ELISA and Tissue print-ELISA can benefit PVM detection in potato plant and tuber samples and field epidemiological studies of PVM. These assays can also facilitate the production of virus-free seed potatoes and breeding for PVM-resistant potato cultivars, leading to the successful prevention of this potato viral disease.

Serological pattern “anti-HBc alone”:Characterization of 552 individuals and clinical significance

AIM： To investigate the prevalence and clinical significance of ＂anti-HBc alone＂ in an unselected population of patients and employees of a university hospital in southern Germany. METHODS： All individuals with the pattern ＂anti-HBc alone＂ were registered over a time span of 82 mo. HBVDNA was measured in serum and liver samples, and clinical charts were reviewed. RESULTS： Five hundred and fifty two individuals were ＂anti-HBc alone＂ （of 3004 anti-HBc positive individuals; 18.4%）, and this pattern affected males （20.5%） more often than females （15.3%; P〈0.001）. HBV-DNA was detected in serum of 44 of 545 ＂anti-HBc alone＂ individuals （8.1%）, and in paraffin embedded liver tissue in 16 of 39 patients tested （41.0%）. There was no association between the detection of HBV genomes and the presence of biochemical, ultrasonic or histological signs of liver damage. Thirty-eight ＂anti-HBc alone＂ patients with cirrhosis or primary liver carcinoma had at least one additional risk factor. HCV-coinfection was present in 20.4% of all individuals with ＂anti-HBc alone＂ and was the only factor associated with a worse clinical outcome. CONCLUSION： In an HBV low prevalence area, no evidence is found that HBV alone causes severe liver damage in individuals with ＂anti-HBc alone＂. Recommendations for the management of these individuals are given.

Epidemiological and Serological Profile of Hepatitis B Virus in an Urban Area in Mali

The objective of our study was to evaluate hepatitis B virus (HBV) infection in an urban population. This longitudinal study was conducted in Bamako District and Kati Commune. After a preparatory phase, the persons who accepted the protocol were assessed for HBsAg. HBsAg carriers had blood collection for HBeAg assay, viral load assessment, genotyping, DNA mutation testing, and severity of hepatic fibrosis and necrosis. At the end of this study, 1475 persons were included, of which 195 had HBsAg positive confirmed, that is to say 13.97%. The mean age of HBsAg positive patients was 35.11 ± 11.12 years with a sex ratio of 2.68. HBeAg was found in 8.9% of the patients tested for this antigen. The viral load was undetectable in 10.52% of patients and greater than 2000 IU/mL in 32.24% of cases. Fibrosis ≥ F2 and necrosis ≥ A2 were found in respectively 19.72% and 6.80% of cases. Genotype E was found in 91.6 patients and an R249S mutation observed in 39.04% of cases. Conclusion: HBV infection has a serious impact on socio-economic development in Mali because it affects mainly the young male population, hence the need to organize preventive measures effectively.