Immunoglobulin G Seropositivity Research Articles

Association between Alzheimer's disease and Toxocara infection/exposure: a case-control study.

Infections may contribute to Alzheimer's disease (AD) risk. Limited evidence suggests Toxocara spp. infection/exposure could influence AD development. We investigated Toxocara seropositivity and AD in Iranian adults using a matched case-control study. Our sample included 90 AD cases and 91 healthy older adults. Anti-Toxocara immunoglobulin G (IgG) antibodies were assessed via enzyme-linked immunosorbent assay. We computed the odds ratios (ORs) and 95% confidence intervals (CIs) through univariable and multivariable analyses, adjusting for potential confounders. There were 33/90 (36.67% [95% CI 26.75 to 47.48]) anti-Toxocara IgG seropositive individuals identified among the AD cases and 21/91 (23.07% [95% CI 14.89 to 33.09]) among the healthy controls. In univariable analysis, a significant association was identified between anti-Toxocara IgG seropositivity and AD (OR 1.93 [95% CI 1.01 to 3.69], p<0.001). Moreover, the association remained significant (OR 2.18 [95% CI 1.05 to 4.49], p<0.001) in multivariable analysis after adjustment for covariates. There was no association between anti-Toxocara IgG seropositivity and the severity of AD (OR 0.75 [95% CI 0.21 to 2.61], p=0.47). Our findings indicated that Toxocara exposure/infection could be a potential risk factor for development of AD. To better understand a real causality between Toxocara exposure/infection and AD and related dementias, follow-up designed and adequately powered studies are needed.

Dengue virus transmission risk in blood donation: Evidence from Thailand.

Individuals infected with dengue virus (DENV) often show no symptoms, which raises the risk of DENV transfusion transmission (TT-DENV) in areas where the virus is prevalent. This study aimed to determine the evidence of DENV infection in blood donors from different geographic regions of Thailand. A cross-sectional study was conducted on blood donor samples collected from the Thai Red Cross National Blood Center and four regional blood centers between March and September 2020. Screening for DENV nonstructural protein 1 (NS1), anti-DENV immunoglobulin G (IgG), and IgM antibodies was performed on residual blood from 1053 donors using enzyme-linked immunosorbent assay kits. Positive NS1 and IgM samples indicating acute infection were verified using four different techniques, including quantitative real-time (q) RT-PCR, nested PCR, virus isolation in C6/36 cells, and mosquito amplification. DENV IgG seropositivity was identified in 89% (938/1053) of blood donors. Additionally, 0.4% (4/1053) and 2.1% (22/1053) of Thai blood donors tested positive for NS1 and IgM, respectively. The presence of asymptomatic dengue virus infection in healthy blood donors suggests a potential risk of transmission through blood transfusion, posing a concern for blood safety.

Association between anti-Helicobacter pylori immunoglobulin G status and coronary artery disease among hypertensives: Myth or fact?

Abstract Background: Chronic persistent inflammation associated with Helicobacter pylori (H. pylori) infection accelerates vascular complications which are prone to cause atherogenesis and coronary artery disease (CAD). This study was undertaken to assess the significance of the association between H. pylori immunoglobulin G (IgG) serostatus and the occurrence of CAD among hypertensives. Materials and Methods: A total of 90 hypertensive subjects without stroke and CAD symptoms were tested for serum H. pylori IgG. Their electrocardiogram and echocardiogram (ECHO) outcomes were analyzed after 3 months. Results: Among the 90 subjects, 52 (57.8%) were H. pylori IgG positive. The adjusted odds ratio for abnormal ECHO outcome and H. pylori IgG positivity was 2.494. There was a positive correlation between H. pylori IgG positivity, sedentary lifestyle, alcoholism, and elevated serum C-reactive protein and abnormal ECHO findings suggestive of CAD. Conclusions: This study found a positive correlation between H. pylori IgG seropositivity and abnormal ECHO outcomes. The prevention of CAD with antimicrobial therapy for H. pylori is simple and innovative. Lifestyle modification and hand hygiene can obviate the adverse circumstances of CAD to some extent.

Seroprevalence of Dengue Antibodies among Healthy Blood Donors from Sabah, Malaysian Borneo: Blood Safety in Dengue-Endemic Communities

Dengue virus (DENV) infection which is an emerging and resurging mosquito-borne infection is a major public health concern in many countries in the tropics and subtropics. It is the most common arbovirus infection globally, and its incidence has increased dramatically in recent decades. Despite several reported transfusion-transmitted cases, the impact of dengue infection on the safety of the blood supply is still controversial. This study aims to determine the seroprevalence of dengue infection among healthy blood donors from Sabah, Malaysia, an area in Southeast Asia that is endemic to the four serotypes of the dengue virus. A cross-sectional study was conducted among 364 eligible blood donors from the Sabah Women and Children Hospital in Sabah State. Serum samples were examined for the presence of dengue-specific immunoglobulin G (IgG) using an enzyme-linked immunosorbent assay (ELISA). Overall, approximately one-third (36.5%, 133/364) of the participants tested positive for dengue anti-IgG. The prevalence of dengue anti-IgG significantly increased with age, with the lowest prevalence (30.5%) among young adults aged 18 – 26 years and the highest prevalence (73.3%) among those aged 56 – 65 years (χ2 = 10.984; P = 0.027). Likewise, the prevalence was higher among male blood donors (38.9%) compared to female donors (31.3%); however, the difference was not statistically significant (χ2 = 0.295; P = 0.267). The high prevalence of dengue IgG seropositivity among healthy blood donors reflects the high endemicity of dengue disease in this region of Malaysia. The findings suggest the need for blood screening for DENV infection by blood donation services in Malaysia to improve transfusion safety, which is of paramount importance for the recipient.

Seropositivity of Borrelia burgdorferi s.l. in Germany—an analysis across four German National Cohort (NAKO) study sites

Lyme borreliosis (LB) is caused by the transmission of Borrelia burgdorferi s.l. from ticks to humans. Climate affects tick abundance, and climate change is projected to promote shifts in abundance in Europe, potentially increasing human exposure. We analyzed serum samples collected between the years 2014–2019 from German National Cohort (NAKO) participants at four study sites (Augsburg, Berlin, Hanover, Münster) for immunoglobulin G (IgG) and immunoglobulin M (IgM) antibodies using an enzyme‐linked immunosorbent assay (ELISA) and line blot immunoassay as confirmatory test for positive and equivocal ELISA samples. We reported crude and weighted seropositivity proportions for local estimates. We used mixed model analysis to investigate associated factors, such as age, sex, migration background, or animal contacts. We determined the serostatus of 14,207 participants. The weighted seropositivity proportions were 3.4% (IgG) and 0.4% (IgM) in Augsburg, 4.1% (IgG) and 0.6% (IgM) in northern Berlin, 3.0% (IgG) and 0.9% (IgM) in Hanover, and 2.7% (IgG) and 0.6% (IgM) in Münster. We found higher odds for IgG seropositivity with advancing age (p < 0.001), among males compared to females (p < 0.001) and reduced odds among participants with migration background compared to those without (p = 0.001). We did not find evidence for an association between serostatus and depression, children within the household, or animal contact, respectively. We found low seropositivity proportions and indications of differences across the study locations, although between-group comparisons did not yield significant results. Comparisons to earlier research are subject to important limitations; however, our results indicate no major increases in seropositivity over time. Nevertheless, monitoring of seropositivity remains critical in light of potential climate-related Borrelia exposure.

Sero-prevalence of rubella-specific antibodies in pregnant women attending antenatal care in Maiduguri, north-eastern Nigeria

Context: Rubella is a disease caused by a virus –rubella virus. Major obstetrics concerns are profound effects of the virus on developing fetuses, which may result in multiple congenital malformations. Although vaccination has reduced the incidence of rubella virus substantially; the world health organization (WHO) estimated that more than 100,000 cases of congenital rubella syndrome occur each year worldwide, most of them in developing countries. Diagnosis of rubella cannot be made on clinical grounds alone due to lack of specific symptoms or signs that are unique to the disease. Laboratory confirmation of suspected cases is done based on the detection of the presence of immunoglobulin M (IgM) during the acute illness or a significant rise in rubella – immunoglobulin G (IgG) antibody titres in the serum of previously infected individuals. Methodology: This is a descriptive cross-sectional study conducted at the antenatal clinic of the Department of Obstetrics and Gynaecology of the University of Maiduguri Teaching Hospital (UMTH), Maiduguri, Borno State, North-Eastern Nigeria. Eligible women who presented for booking for antenatal care at the hospital were recruited. Their bio-data, educational status, and history of vaccination with measles and previous obstetrics outcomes were obtained. Five milliliters of venous blood was taken and the serum obtained from the sample was analyzed for anti-rubella IgG antibodies. The samples that were negative for IgG were tested for IgM antibodies. Data obtained analyzed using the statistical package for social science SPSS v16.0.0 (Sept 13, 2007) Inc, Illinois, USA. Results: There were 459 pregnant women who consented and participated in the study. Their age range is 17-43 years (mean= 25.8±5.3). There were 280 (61.0%) patients who were multiparous (mean=3.5±2.1) and women with secondary education accounted for 39.4%. Four hundred twenty-one women (91.7%) women tested positive for rubella-specific IgG antibodies, and of the remaining 38 women, 6 (15.8%) were positive for IgM rubella-specific antibody. Most of the patients (98.1%) with positive IgG had serum titers in the range of 51-150U/mL. All the patients with positive IgM antibodies were followed up till birth, all the pregnancies were carried to term and none of the neonates was found to have any congenital malformation. None of the socio-demographic characteristics were found to be significantly associated with presence of IgG antibodies. Past history of abortions and congenital cataracts were significantly associated with IgG sero-positivity. Conclusion: The sero-prevalence of anti-rubella IgG sero-positivity is high in Maiduguri and this indicates high herd immunity. The number of pregnant women requiring rubella vaccination postpartum in also large. It is recommended that inclusion of rubella vaccination in the National programme on Immunization protocol will be cost effective in the control of rubella and CRS.

Ecological and subject-level drivers of interepidemic Rift Valley fever virus exposure in humans and livestock in Northern Kenya

Nearly a century after the first reports of Rift Valley fever (RVF) were documented in Kenya, questions on the transmission dynamics of the disease remain. Specifically, data on viral maintenance in the quiescent years between epidemics is limited. We implemented a cross-sectional study in northern Kenya to determine the seroprevalence, risk factors, and ecological predictors of RVF in humans and livestock during an interepidemic period. Six hundred seventy-six human and 1,864 livestock samples were screened for anti-RVF Immunoglobulin G (IgG). Out of the 1,864 livestock samples tested for IgG, a subset of 1,103 samples was randomly selected for additional testing to detect the presence of anti-RVFV Immunoglobulin M (IgM). The anti-RVF virus (RVFV) IgG seropositivity in livestock and humans was 21.7% and 28.4%, respectively. RVFV IgM was detected in 0.4% of the livestock samples. Participation in the slaughter of livestock and age were positively associated with RVFV exposure in humans, while age was a significant factor in livestock. We detected significant interaction between rainfall and elevation's influence on livestock seropositivity, while in humans, elevation was negatively associated with RVF virus exposure. The linear increase of human and livestock exposure with age suggests an endemic transmission cycle, further corroborated by the detection of IgM antibodies in livestock.

Investigating the impact of prior COVID-19 on IgG antibody and interferon γ responses after BBIBP-CorV vaccination in a disease endemic population: A prospective observational study.

COVID-19 vaccinations have reduced morbidity and mortality from the disease. Antibodies againstsevere acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) have been associated with immune protection. Seroprevalence studies revealed high immunoglobulin G (IgG) antibody levels to SARS-CoV-2 in the Pakistani population before vaccinations. We investigated the effect of BBIBP-CorV vaccination on circulating IgG antibodies and interferon (IFN)-γ from T cells measured in a cohort of healthy individuals, with respect to age, gender, and history of COVID-19. The study was conducted between April and October 2021. BBIBP-CorV vaccinated participants were followed up to 24 weeks. Antibodies to SARS-CoV-2 Spike protein and its receptor-binding domain (RBD) were measured. IFNγ secreted by whole blood stimulation of Spike protein and extended genome antigens was determined. Study participants with a history of prior COVID-19 displayed a higher magnitude of IgG antibodies to Spike and RBD. IgG seropositivity was greater in those with prior COVID-19, aged 50 years or younger and in females. At 24 weeks after vaccination, 37.4% of participants showed IFN-γ responses to SARS-CoV-2 antigens. T cell IFN-γ release was higher in those with prior COVID-19 and those aged 50 years or less. Highest IFN-γ release was observed to extended genome antigens in individuals both with and without prior COVID-19. We found that IgG seropositivity to both Spike and RBD was affected by prior COVID-19, age and gender. Importantly, seropositive responses persisted up to 24 weeks after vaccination. Persistence of vaccine induced IgG antibodies may be linked to the high seroprevalence observed earlier in unvaccinated individuals. Increased T cell reactivity to Spike and extended genome antigens reflects cellular activation induced by BBIBP-CorV. COVID-19 vaccination may have longer lasting immune responses in populations with a higher seroprevalence. These data inform on vaccination booster policies for high-risk groups.

The Associations between Helicobacter Pylori immunoglobulin G seropositivity and body mass index in adults

ObjectivesInconsistent evidence currently exists regarding the associations between Helicobacter Pylori (H. pylori) infection and body mass index (BMI). The goal of the current study was to examine independent associations of H. pylori immunoglobulin G (IgG) seropositivity and BMI in a U.S.-based population sample.MethodsThe US National Health and Nutrition Examination Survey (NHANES) with 2,576 subjects from 1999 to 2000 were analyzed. Using multivariate logistic regression models, associations between H. pylori IgG seropositivity and BMI were calculated after potential confounders were taken into account. Subgroup analyses were conducted furtherly stratified by sex, age, and race.ResultsH. pylori IgG seropositivity was not associated with BMI in the general population (OR = 0.998; 95% CI = 0.977–1.019; P = 0.842). In the subgroup analyses stratified by race, a negative correction was found between the H. pylori IgG seropositivity and BMI among other races (OR = 0.873; 95% CI = 0.795–0.959; P = 0.004) except non-Hispanic white (OR = 1.006, 95% CI 0.966 to 1.048, P = 0.762), non-Hispanic black (OR = 1.021, 95% CI 0.979 to 1.065, P = 0.335), and Mexican American (OR = 1.010, 95% CI 0.966 to 1.055, P = 0.665).ConclusionsIn the general population, H. pylori IgG seropositivity is not associated with increased BMI, which provides a new perspective on obesity management.

A mixture model to estimate SARS-CoV-2 seroprevalence in Chennai, India.

Serological assays used to estimate SARS-CoV-2 seroprevalence often rely on manufacturer cut-offs established based on severe cases. We conducted a household-based serosurvey of 4,677 individuals in Chennai, India from January to May, 2021. Samples were tested for SARS-CoV-2 IgG antibodies to the spike (S) and nucelocapsid (N) proteins. We calculated seroprevalence, defining seropositivity using manufacturer cut-offs and using a mixture model based on measured IgG. Using manufacturer cut-offs, there was a five-fold difference in seroprevalence estimated by each assay. This difference was largely reconciled using the mixture model, with estimated anti-S and anti-N IgG seroprevalence 64.9% (95% Credible Interval [CrI], 63.8-66.0) and 51.5% (95% CrI, 50.2-52.9) respectively. Age and socioeconomic factors showed inconsistent relationships with anti-S and anti-N IgG seropositivity using manufacturer cut-offs. In the mixture model, age was not associated with seropositivity, and improved household ventilation was associated with lower seropositivity odds. With global vaccine scale-up, the utility of the more stable anti-S IgG assay may be limited due to the inclusion of the S protein in several vaccines. SARS-CoV-2 seroprevalence estimates using alternative targets must consider heterogeneity in seroresponse to ensure seroprevalence is not underestimated and correlates not misinterpreted.

Cytomegalovirus infection associated with smaller cerebellum in severe mental illness

IntroductionPostnatal cytomegalovirus (CMV) infection of immunocompetent hosts is usually inapparent but typically results in lifelong latency. Congenital CMV infections as well as CMV infections in patients with immunodeficiencies have been linked to major cerebellar pathology. Patients with severe mental illness have been repeatedly found to have smaller cerebellum, and they may be particularly susceptible to CMV infections. Finally, both animal and human studies have shown a differential male and female immune response to CMV.ObjectivesWe evaluated whole cerebellar grey matter volumes (CGMV) in CMV immunoglobulin G (IgG) seropositive (CMV+) and seronegative (CMV-) patients with severe mental illness and healthy controls (HC). We hypothesized that CMV seropositivity, reflecting previous infection and current latency, is associated with smaller CGMV in patients but not in HC, and that such a putative association may be sex-dependent.MethodsWe included 529 adult patients with severe mental illness (CMV+ 57%, women 48%), i.e., 324 patients with schizophrenia spectrum disorders and 205 patients with bipolar spectrum disorders, and 494 HC (CMV+ 56%, women 45%). MRI scans were obtained with a 1.5T Siemens scanner (n=596) and two 3.0T General Electric scanners (n=427), and processed with FreeSurfer v6.0. Circulating CMV IgG concentrations were measured with immunoassays. In age-, scanner- and estimated total intracranial volume-adjusted analyses of covariance (ANCOVAs), we investigated main and interaction effects of CMV status and sex on CGMV in patients and HC.ResultsCMV+ patients had smaller CGMV than CMV- patients (p=0.042). There was no CGMV difference between CMV+ and CMV- HC (p=0.858). The adjusted CGMV means in CMV+ patients and CMV- patients were 115078 mm3 and 116725 mm3, respectively (p=0.042); the adjusted CGMV means in CMV+ and CMV- HC were 117980 mm3 and 117840 mm3, respectively (p=0.858) (Image). Among patients, a trend towards CMV-by-sex interaction (p=0.073) was found. Post-hoc analyses showed a significant CMV-CGMV association in the female patient group (p=0.005), with no association among male patients (p=0.840).Image:ConclusionsCMV IgG seropositivity is associated with smaller cerebellum in severe mental illness, an effect driven by the female patients, but not among HC. This may indicate a CMV-related deleterious impact on cerebellum restricted to patients.Disclosure of InterestNone Declared

Perilaku Seksual Sebagai Risiko Seropositif Imunoglobulin G (IgG) Toxoplasma Gondii Pada Pria Homoseksual Penderita HIV

Sexual behavior is one of the factors thought to be associated with Toxoplasma gondii infection. Several studies have shown that sexual behavior such as oral sex, a history of injuries to the genital organs during sexual intercourse, and working as a sex worker are associated with Toxoplasma gondii infection. In addition, a history of injecting narcotic use is also associated with Toxoplasma gondii infection. One method to determine infection status is serological examination, through measurement of immunoglobulin G (IgG). IgG seropositivity is the basis for determining the status of Toxoplasma gondii infection in the chronic or latent phase. This study aims to determine the relationship between sexual behavior and history of injecting drug use with Toxoplasma gondii infection based on IgG serological status. The study population in this study were 56 homosexual men with Human Immunodeficiency Virus (HIV) in the DKI Jakarta area, Bogor Regency and City, and Depok City. In this study, the infection status of Toxoplasma gondii was measured by the ELISA method at the Department of Parasitology, Faculty of Medicine, University of Indonesia. Sexual behavior and history of injecting drug use were measured using a questionnaire. The results of the study proved that 38 samples had positive serological status, 17 samples had negative serological status, and 1 sample was in the borderline range. Based on an analysis using the logistic regression test, age, education, getting paid for having sex, using condoms during oral sex, and a history of injuries to the genital organs during sex are risk factors for Toxoplasma gondii infection.

The Correlation between Helicobacter pylori Immunoglobulin G Seropositivity and Plasma Homocysteine Levels in Adults.

Helicobacter pylori (H. pylori) immunoglobulin G (IgG) seropositivity is prevalent, but its correlation with homocysteine (Hcy), a biomarker of vascular risk events, is unclear. This study is aimed at exploring the correlation of H. pylori IgG seropositivity and plasma Hcy levels in adults. Data was obtained from the National Health and Nutrition Examination Survey (NHANES) cycle 1999-2000. Hcy was measured by the Abbott homocysteine assay, and H. pylori IgG was measured by enzyme-linked immunosorbent assays. The weighted multiple logistic regression analyses with adjustments for potential confounders were conducted. Subgroup analyses stratified by gender, age, and race were performed. A total of 4029 subjects aged 20-85 years were included. Population prevalence of H. pylori IgG seropositivity was 44.7% in the overall population with higher prevalence found in those with older age, Mexican Americans, lower education, and lower household income. Levels of plasma Hcy were not elevated in those with H. pylori IgG seropositivity versus seronegativity (β -0.120 (-0.438, 0.199) P = 0.462). This difference was not significant after stratifying by gender and age. However, in the subgroup analyses stratified by race, a negative correlation between H. pylori seropositivity and plasma Hcy levels was observed in Mexican Americans (β -0.802 (-1.253, -0.352) P < 0.001). H. pylori IgG seropositivity was not associated with plasma Hcy levels in the general population, but there may be a negative correlation in Mexican Americans. These findings provide new insights to advance the research of the link between plasma Hcy levels and stomach health.

BNT162b2 COVID-19 vaccination elicited protective robust immune responses in pediatric patients with inborn errors of metabolism.

SARS-CoV-2 infection can lead to a life-threatening acute metabolic decompensation in children with inborn errors of metabolism (IEM), so vaccination is mandatory. However, IEMs can also impair innate or adaptive immunity, and the impact of these immune system alterations on immunogenicity and vaccine efficacy is still unknown. Here, we investigated humoral immune responses to the BNT162b2 mRNA COVID-19 vaccine and clinical outcomes in pediatric IEM patients. Fifteen patients between 12-18 years of age with a confirmed diagnosis of IEM, and received BNT162b2 were enrolled to the study. Patients with an anti-SARS-CoV-2 IgG concentration >50 AU/mL before vaccination were defined as "COVID-19 recovered" whereas patients with undetectable anti-SARS-CoV-2 IgG concentration were defined as "COVID-19 naïve". Anti-SARS-CoV-2 Immunoglobulin G (IgG) and SARS-CoV-2 neutralizing antibody (nAb) titers were measured to assess humoral immune response. Anti-SARS-CoV-2 IgG titers and nAb IH% increased significantly after the first dose. The increase in antibody titers after first and second vaccination remained significant in COVID-19 naïve patients. Complete anti-SARS-CoV-2 IgG seropositivity and nAb IH% positivity was observed in all patients after the second dose. Vaccination appears to be clinically effective in IEM patients, as none of the patients had COVID-19 infection within six months of the last vaccination. Humoral immune response after two doses of BNT162b2 in pediatric IEM patients was adequate and the immune response was not different from that of healthy individuals.

Seroprevalence of Rubella Virus Infection in Susceptible Women of Childbearing Age Group Seeking Preconceptional Counselling and Infertility Treatment- A Cross-sectional Study from Eastern India

Introduction: Rubella is an acute viral infection predominantly affecting children and adults. Although natural infection with rubella provide lifelong immunity, but, primary infection in pregnant women during the initial days of pregnancy may result in spontaneous abortion, stillbirth, or a baby born with Congenital Rubella Syndrome (CRS), which can be prevented by vaccinating the susceptible non immune females one month prior to planning conception. Aim: To determine rubella virus immune status and demographic profile of women in childbearing age group, and counsel all Rubella virus infection susceptible women for vaccination prior to planning pregnancy. Materials and Methods: A cross-sectional observational study was done at Indira Gandhi Institute of Medical Sciences (IGIMS), Patna , Bihar, India, on 112 apparently healthy, asymptomatic women in the 18-45 years age group coming for preconceptional counselling and primary and secondary infertility treatment during April 2017 to March 2019, whose serum rubella Immunoglobulin G (IgG) antibody testing was done by Enzyme- linked Immunosorbent Assay (ELISA). The data regarding their rubella virus immune status, age, parity and occupations were coded and recorded in MS Excel spreadsheet program. The Statistical Package for the Social Sciences (SPSS) version 23 (IBM Corp.) was used for data analysis. Results: Out of the total 112 women {92 (82.1%) housewife and 20 (17.9%) professionals} included in this study , a total of 67 (59.8%) women tested positive for rubella IgG antibody and 45 (40.2%) tested negative for rubella IgG antibody. The mean age of the rubella virus seropositive immune patients and seronegative susceptible women was 27.72±4.83 years was 26.09±4.68 years respectively. Among the 67 seropositive patients, maximum antirubella virus IgG seropositivity (71.4%) was seen in more than 35 years age group and maximum seronegativity 23 (46.9%) was seen in 18-26 years age group. There was no direct association of occupation and parity with rubella immune status. Conclusion: Higher rate of antirubella IgG seronegativity amongst younger age groups and nulliparous women renders them susceptible to primary Rubella virus infection. Hence, Rubella IgG antibody screening, proper counselling and prompt rubella vaccination for all primary Rubella virus infection susceptible women is necessary one month prior to planning conception, to avoid foetal congenital malformations during subsequent pregnancies.

High seroprevalence of Immunoglobulin G (IgG) and IgM antibodies to SARS-CoV-2 in asymptomatic and symptomatic individuals amidst vaccination roll-out in western Kenya.

The population's antibody response is a key factor in comprehending SARS-CoV-2 epidemiology. This is especially important in African settings where COVID-19 impact, and vaccination rates are relatively low. This study aimed at characterizing the Immunoglobulin G (IgG) and Immunoglobulin M (IgM) in both SARS-CoV-2 asymptomatic and symptomatic individuals in Kisumu and Siaya counties in western Kenya using enzyme linked immunosorbent assays. The IgG and IgM overall seroprevalence in 98 symptomatic and asymptomatic individuals in western Kenya between December 2021-March 2022 was 76.5% (95% CI = 66.9-84.5) and 29.6% (95% CI = 20.8-39.7) respectively. In terms of gender, males had slightly higher IgG positivity 87.5% (35/40) than females 68.9% (40/58). Amidst the ongoing vaccination roll-out during the study period, over half of the study participants (55.1%, 95% CI = 44.7-65.2) had not received any vaccine. About one third, (31.6%, 95% CI = 22.6-41.8) of the study participants had been fully vaccinated, with close to a quarter (13.3% 95% CI = 7.26-21.6) partially vaccinated. When considering the vaccination status and seroprevalence, out of the 31 fully vaccinated individuals, IgG seropositivity was 81.1% (95% CI = 70.2-96.3) and IgM seropositivity was 35.5% (95% CI = 19.22-54.6). Out of the participants that had not been vaccinated at all, IgG seroprevalence was 70.4% (95% CI 56.4-82.0) with 20.4% (95% CI 10.6-33.5) seropositivity for IgM antibodies. On PCR testing, 33.7% were positive, with 66.3% negative. The 32 positive individuals included 12(37.5%) fully vaccinated, 8(25%) partially vaccinated and 12(37.5%) unvaccinated. SARs-CoV-2 PCR positivity did not significantly predict IgG (p = 0.469 [95% CI 0.514-4.230]) and IgM (p = 0.964 [95% CI 0.380-2.516]) positivity. These data indicate a high seroprevalence of antibodies to SARS-CoV-2 in western Kenya. This suggests that a larger fraction of the population was infected with SARS-CoV-2 within the defined period than what PCR testing could cover.

KONYA İLİNDE ÇOCUK YAŞ GRUPLARINDA HEPATİT A SEROPOZİTİVİTESİ

OBJECTIVE: Hepatitis A virus (HAV) infection is common especially in developing countries worldwide. Prevalence of HAV varies according to public hygiene and sanitation conditions. In this study, it was aimed to determine seropositivity of HAV in pediatric patients in Konya province, investigate its distribution according to age groups, gender and seasons and compare findings with those reported in previous studies.MATERIAL AND METHODS: In this study, records of 760 pediatric patients admitted to our hospital with various complaints and tested for anti-HAV immunoglobulin G(IgG)/ immunoglobulin M(IgM) between January 2019-April 2020 were evaluated retrospectively. Anti-HAV IgG/IgM in serum samples were analyzed by chemiluminescent microparticle enzyme immunassay method. Statistical analysis was performed by using chi-square Monte Carlo exact test.RESULTS: Anti-HAV IgG seropositivity was found to be 52.2% while anti-HAV IgM positivity was 0.5% for all patients. Seropositivity rate of anti-HAV IgG/IgM was detected as 5.3%. It was observed that anti-HAV IgG/IgM seropositivity rate significantly decreased in age groups of 9-14 (32.5%) and 15-18 (15%) compared to 3-8 (52.5%) age group (p&amp;lt;0.05). Males had significantly higher seropositivity rates of anti-HAV IgG (64.8%) compared with females (p&amp;lt;0.05). Seropositivity rate of anti-HAV IgG/IgM (42.5%) demonstrated a statistically significant increase in winter (p&amp;lt;0.05).CONCLUSIONS: HAV vaccine has been included into routine vaccination program in our country, in 2012. It was thought that anti-HAV IgG seropositivity might be related to maternal antibodies in patients under two years of age and its higher rate in 3-8 age group compared to other age groups has been the result of routine vaccination. Seropositivity rate of anti-HAV IgG/IgM together significantly increased in winter. This can be explained by insufficiency of sewerage and infrastructure systems with increasing rainfall in this season. Frequency of HAV infection can be reduced by strict follow-up of vaccine administration and attention to hygiene and sanitation conditions.

Detectable Respiratory Viruses IgM and IgG Antibodies among Children with Acute Respiratory Tract Infections in Owo, Ondo State, Nigeria

Globally, in children, less than 5 years of age, acute respiratory tract infections (ARTIs) are a major cause of morbidity and mortality. Long-lasting immunity is not induced by respiratory infections as reinfection can occur throughout life. This study aimed to determine the seroprevalence of six respiratory viruses specific immunoglobulin M (IgM) and immunoglobulin G (IgG) antibodies in children with ARTIs in Owo, Ondo State. The sera samples of two hundred (200) subjects who consented to participate in the study were collected and tested using serum-specific Enzyme-Linked Immunosorbent Assay (ELISA) kits, anti-immunoglobulin M (IgM) and anti-immunoglobulin G (IgG) antibodies to the influenza A virus (FLU-A), respiratory syncytial virus (RSV), parainfluenza virus (PIV), coronavirus (CoV), rhinovirus (RV) and adenovirus (AdV) respectively (IgM and IgG ELISA Kits; Melsin Medical Co., China). The mean age of the subjects tested was 3.49±1.41. The total IgM seropositivity was detected in 83% of the children with the highest being AdV 91 (45.5%), followed by PIV 89 (44.5%), FLU-A and RV with 88 (44%) respectively, CoV 85 (42.5%), and RSV 80 (40%). The total IgG seropositivity was detected in 87.5% of the children with the highest being PIV 152 (76%), followed by RSV 135 (67.5%), RV 93 (46.5%), AdV 81 (40.5%), CoV and FLU A 76 (38%) respectively. The study revealed the presence of primary and secondary infection of respiratory viruses in Owo and the need for preventive and control measures against respiratory tract viruses are suggested.

Regional seropositivity for Borrelia burgdorferi and associated risk factors: findings from the Rhineland Study, Germany

BackgroundLyme borreliosis is the most prevalent vector-borne disease in Europe, and numbers might increase due to climate change. However, borreliosis is not notifiable in North Rhine-Westphalia (NRW), Germany. Hence, little is known about the current human seroprevalence in NRW. However, the proportion of Borrelia burgdorferi sensu lato-infected ticks has increased in a NRW nature reserve. The literature suggests increasing age and male sex as risk factors for seropositivity, whereas the influence of socioeconomic status is controversial. Thus, we aimed to determine regional seropositivity for Borrelia burgdorferi sensu lato (B. burgdorferi s.l.) and its risk factors in the Rhineland Study population in Bonn, NRW, and to compare it with previous surveys to evaluate potential effects of climate change.MethodsWe assessed seropositivity in 2865 Rhineland Study participants by determining immunoglobulin G (IgG) and immunoglobulin M (IgM) antibodies for B. burgdorferi s.l. using a two-step algorithm combining enzyme-linked immunosorbent assay tests and line immunoblots. We calculated the odds of being classified as IgG or IgM positive as a function of age, sex, and educational level using binomial logistic regression models. We applied varying seropositivity classifications and weights considering age, sex and education to compensate for differences between the sample and regional population characteristics.ResultsIgG antibodies for B. burgdorferi s.l. were present in 2.4% and IgM antibodies in 0.6% of the participants (weighted: 2.2% [IgG], 0.6% [IgM]). The likelihood of IgG seropositivity increased by 3.0% (95% confidence interval [CI] 1.5–5.2%) per 1 year increase in age. Men had 1.65 times the odds for IgG seropositivity as women (95% CI 1.01–2.73), and highly educated participants had 1.83 times the odds (95% CI 1.10–3.14) as participants with an intermediate level of education. We found no statistically significant link between age, sex, or education and IgM seropositivity. Our weighted and age-standardized IgG seroprevalence was comparable to the preceding serosurvey German Health Interview and Examination Survey for Adults (DEGS) for NRW.ConclusionsWe confirmed that increasing age and male sex are associated with increased odds for IgG seropositivity and provide evidence for increased seropositivity in the highly educated group. B. burgdorferi s.l. seropositivity remained constant over the past decade in this regional German population.Graphical abstract

Cytomegalovirus infection associated with lower IQ in adolescent patients with schizophrenia spectrum disorders: A preliminary report

Cytomegalovirus (CMV) infection of immunocompetent hosts is usually inapparent, but typically results in a non-silent chronic latency which is considerably more active than previously considered. In adults with schizophrenia spectrum disorders, CMV latent infection has been associated with cognitive disturbance including lower intelligent quotient (IQ). We hypothesized that the same pattern will be present in adolescent patients with schizophrenia spectrum disorders (early-onset non-affective psychosis). We included 17 adolescents with schizophrenia spectrum disorders (10 patients with schizophrenia, one patient with schizoaffective disorder and six patients with psychosis not otherwise specified), mean age 16.7 years, females 71% and CMV seropositivity 35%. Current IQ was estimated with the Wechsler Abbreviated Scale of Intelligence. CMV immunoglobulin G (IgG) concentrations were measured by solid-phase immunoassays and expressed as dichotomous measures (seropositive/CMV + vs. seronegative/CMV-). CMV + patients (mean IQ 91) had significantly lower full-scale IQ than CMV- patients (mean IQ 110) (20 units difference; p < 0.001). Post-hoc analyses showed that CMV + patients had both lower performance and lower verbal IQ relative to CMV- patients (p = 0.001 and 0.049, respectively). In this preliminary report, we found that CMV IgG seropositivity, reflecting previous CMV infection and current latency, was associated with lower IQ. This may be indicative of an unfavorable impact of CMV infection on general intelligence in early-onset non-affective psychosis.