Seropositive Children Research Articles

Inflammatory cytokine responses in pediatric tuberculosis with or without SARS-CoV-2 seropositivity

To characterize the inflammatory cytokine profiles in children with TB in the presence and absence of SARS-CoV2 seropositivity. This study evaluated cytokine responses in two groups of children with TB: CoV2+ (TB and SARS-CoV2 seropositive) and CoV2- (TB and SARS-CoV2 seronegative). Each group had 30 children, and cytokine levels were measured at baseline, month 3, and 6. At baseline, CoV2+ children exhibited significantly elevated levels of cytokines including IFN-γ, IL-2, TNFα, IL-1α, and IL-6, and reduced levels of IL-1β and IL-18, compared to CoV2- children. No significant differences in cytokine levels between the groups were observed at months 3 and 6. Additionally, a general decline in cytokine levels was noted over the course of treatment in both groups. A positive correlation was found between most cytokines and SARS-CoV2 IgG spike protein levels at baseline and at month 3 in the CoV2+ group. This study is one of the first studies to characterize the systemic inflammatory responses in SARS-CoV2 seropositive and seronegative children with TB from a TB endemic country. The findings enhance our understanding of the immunopathogenesis of TB and SARS-CoV2 seropositivity in children and may inform future therapeutic strategies.

The Interruption of Transmission of Onchocerciasis in Abia, Anambra, Enugu, and Imo States, Nigeria: The Largest Global Onchocerciasis Stop-Treatment Decision to Date.

Onchocerciasis causes severe morbidity in sub-Saharan Africa. Abia, Anambra, Enugu, and Imo states of Nigeria were historically classified meso- or hyperendemic and eligible for ivermectin mass drug administration (MDA). After ≥25 years of annual and biannual MDA, serological and entomological assessments were conducted to determine if Onchocerca volvulus transmission was interrupted. Dried blood spots collected in October 2020 from ≥3167 children 5-9 years old in each state were screened for O. volvulus-specific Ov16 antibody by enzyme-linked immunosorbent assay. Additionally, 52,187 Simulium damnosum heads (≥8845 per state) collected over 12 months between 2021 and 2022 were tested by pooled polymerase chain reaction (PCR) for O-150 DNA. Among seven seropositive children, four were found for follow-up skin snip PCR to confirm active infection. Three were negative and the fourth was excluded as he was visiting from an endemic state. The final seroprevalence estimates of each state had 95% upper confidence limits (UCL) < 0.1%. All fly pools were negative by O-150 PCR, giving a 95% UCL infective fly prevalence < 0.05% in each state. Each state therefore met the World Health Organization epidemiological and entomological criteria for stopping MDA effective January 2023. With 18.9 million residents eligible for MDA, this marked the largest global onchocerciasis stop-treatment decision to date.

Is the rise in childhood obesity rates leading to an increase in hospitalizations due to dengue?

Background Obesity and diabetes are known risk factors for severe dengue. Therefore, we sought to investigate the association of obesity with increased risk of hospitalization, as there is limited information. Methods and findings Children aged 10 to 18 years (n = 4782), were recruited from 9 districts in Sri Lanka using a stratified multi-stage cluster sampling method. Details of previous admissions to hospital due to dengue and anthropometric measurements were recorded and seropositivity rates for dengue were assessed. The body mass index (BMI) centile in children aged 10 to 18, was derived by plotting the values on the WHO BMI-for-age growth charts, to acquire the percentile ranking. Results Although the dengue seropositivity rates were similar in children of the different BMI centiles, 12/66 (18.2%) seropositive children with a BMI centile &gt;97th, had been hospitalized for dengue, compared to 103/1086 (9.48%) of children with a BMI centile of &lt;97th. The logistic regression model suggested that BMI centiles 50th to 85th (OR = 1.06, 95% CI, 1.00 to 1.11, p = 0.048) and BMI centile of &gt;97th (OR 2.33, 95% CI, 1.47 to 3.67, p = 0.0003) was significantly associated with hospitalization when compared to children in other BMI categories. Conclusions Obesity appears to be associated with an increased risk of hospitalization in dengue, which should be further investigated in longitudinal prospective studies. With the increase in obesity in many countries, it would be important to create awareness regarding obesity and risk of severe disease and hospitalization in dengue.

Safety and Immunogenicity of an mRNA-Based hMPV/PIV3 Combination Vaccine in Seropositive Children.

Human metapneumovirus (hMPV) and parainfluenza virus type 3 (PIV3) are common respiratory illnesses in children. The safety and immunogenicity of an investigational mRNA-based vaccine, mRNA-1653, encoding membrane-anchored fusion proteins of hMPV and PIV3, was evaluated in hMPV/PIV3-seropositive children. In this phase 1b randomized, observer-blind, placebo-controlled, dose-ranging study, hMPV/PIV3-seropositive children were enrolled sequentially into 2 dose levels of mRNA-1653 administered 2 months apart; children aged 12 to 36 months were randomized (1:1) to receive 10-μg of mRNA-1653 or placebo and children aged 12 to 59 months were randomized (3:1) to receive 30-μg of mRNA-1653 or placebo. Overall, 27 participants aged 18 to 55 months were randomized; 15 participants received 10-μg of mRNA-1653 (n = 8) or placebo (n = 7), whereas 12 participants received 30-μg of mRNA-1653 (n = 9) or placebo (n = 3). mRNA-1653 was well-tolerated at both dose levels. The only reported solicited local adverse reaction was tenderness at injection site; solicited systemic adverse reactions included grade 1 or 2 chills, irritability, loss of appetite, and sleepiness. A single 10-μg or 30-μg mRNA-1653 injection increased hMPV and PIV3 neutralizing antibody titers (geometric mean fold-rise ratio over baseline: hMPV-A = 2.9-6.1; hMPV-B = 6.2-13.2; PIV3 = 2.8-3.0) and preF and postF binding antibody concentrations (geometric mean fold-rise ratio: hMPV preF = 5.3-6.1; postF = 4.6-6.5 and PIV3 preF = 13.9-14.2; postF = 11.0-12.1); a second injection did not further increase antibody levels in these seropositive children. Binding antibody responses were generally preF biased. mRNA-1653 was well-tolerated and boosted hMPV and PIV3 antibody levels in seropositive children aged 12 to 59 months, supporting the continued development of mRNA-1653 or its components for the prevention of hMPV and PIV3.

Trend of HIV Prevalence in Antenatal Women in a Tertiary Care Hospital in the Western Region of India.

Background The severity of AIDS and the social and personal implications of HIV makes the epidemiological study of HIV more difficult. Surveillance studies remain the mainstay of understanding thetrends of HIV infection. In this study, we aimed to determine the trend in the prevalence of HIV in the antenatal women attending our hospital situated in the western region of India over the period of the last nine years and theART adherence and the viral loads of the cluster of positive patients identified from this antenatal HIV testing. Methodology A retrospective study was conducted by collecting data fornine years from January 2015 to December 2023 from the PPTCT (Prevention of Parent to Child Transmission) Centre and ART (Anti-Retroviral Treatment) Centre of the hospital. All pregnant women attending antenatal clinics and being admitted to the labor room are counseled for HIV testing as per the National AIDS Control Organisation (NACO) guidelines of India. The data of the total antenatal women counseled for HIV testing and who tested HIV positivewere collected. The HIV prevalence rate was derived and the trend of HIV prevalence in antenatal women attending the hospital was determined over the study period. The data on ART adherence and the viral load of these HIV-positive women detected antenatally and their seropositive spouseand children were collected and analyzed. Results A total of 22,584 antenatal women were counseled for HIV testing during the study period. No women opted out and there was 100% testing of these 22,584 antenatal women for HIV. Fifty antenatal women tested positive for HIV, resulting in an overall HIV prevalence of 0.22% (50/22,584) during the study period. There was adeclining trend of HIV prevalence among antenatal women from 2020 to 2023 (from 0.37% to 0.19%). Of the 50 seropositive antenatal women, 42remained bookedat our ART Centre for treatment. Thirty (71%) women are still adhered to taking ART. Of their 20 seropositive spouses, 14 (70%) have remained adhered to ART. Twenty-eight (93%) female patients on ART and 13 (93%) spouses on ART have suppressed viral loads. Two children of these seropositive mothers had tested HIV positive. ART adherence and suppressed viral load were seen in both seropositive children. Conclusion The study reflects a decline in antenatal seroprevalence in recent years in our region. The antenatal HIV prevalence trends have major implications on mother-to-child transmission and these positive antenatal cases serveas index cases bringing the testing opportunity for the so-called identified as the non-high-risk population. ART adherence of positive female patients, after the completion of the antenatal period, remains the challenge in our region, which requires improvement in the outreach activities and increased motivation and awareness of these patients regarding the importance of taking lifelong ART.

Autoimmune encephalitis in Israeli children – A retrospective nationwide study

Immune-mediated or autoimmune encephalitis (AE) is a relatively new, rare and elusive form of encephalitis in children. We retrospectively collected seropositive children (0–18 years old) with well characterized antibodies through 3 reference laboratories in Israel. Clinical symptoms, MRI and EEG findings and treatment courses were described. A total of 16 patients were included in the study, with 10 females. Anti NMDA encephalitis was most common followed by anti HU and anti mGLuR1. Psychiatric symptoms, abnormal movements, seizures and behavioral changes were the most common presentation. Pathological MRI and EEG findings were described in 37% and 56% of children, respectively. Treatment with corticosteroids, Intravenous immunoglobulins (IVIG) was first line in most children. Following inadequate response children were treated with plasmapheresis and/or rituximab. Two patients relapsed following both first and second line protocols. In terms of long term prognosis, 9 children (56%) had one or more residual behavioral, psychiatric or neurologic findings. Three children required hospitalization for rehabilitation. AE remains a rare diagnosis with variable presenting symptoms, requiring a high index of suspicion. Consensus recommended treatment is generally effective in the pediatric population. Female gender was associated with a higher chance of severe disease. Larger cohorts would be needed to identify prognostic factors in the pediatric population.

Association between Parvovirus B19 and thyroid/celiac autoantibodies among T1DM pediatric patients.

In recent years, an overwhelming association between Pediatric Type 1 Diabetes Mellitus (T1DM) and autoimmune diseases has been largely reported. The current study was designed to determine a possible association between autoimmune thyroiditis (AIT), celiac disease (CD) - associated autoantibodies, and Parvovirus B19 infection among pediatric T1DM cases in the southwestern region of Saudi Arabia. Blood samples from age groups 1-18 years attending the Diabetic Clinic were collected over a period of 12 months. Serum anti-thyroid peroxidase (TPO), anti-thyroglobulin (TG), anti-tissue transglutaminase immunoglobulin A (TG-IgA), endomysial IgA (EMA-IgA), Parvovirus B19-IgG and IgM antibodies were detected by standard methods. The results showed the prevalence of autoantibodies against thyroid and CD among pediatric T1DM patients to be 44 (25%) and 25 (14.4%), respectively. The prevalence of antibodies against B19 was 70 (40%). Further determination of the prevalence of Parvovirus B19-IgG antibodies and thyroid antibodies among T1DM pediatric patients revealed that there was a significant association between them with a p<0.0491. The prevalence of autoantibodies against the thyroid was higher among the seropositive Parvovirus B19 children with T1DM. A positive association between the prevalence of autoantibodies against thyroid disease and the increase in the duration of diabetes was also noted. Hence, periodic screening of T1DM patients for B19 antibodies and autoantibodies for thyroid is crucial.

Utility of the Presence of Anti-SARS-CoV-2 Antibodies in Detecting COVID-19 in Symptomatic Children and Adolescents: An Analytical Cross-sectional Study

Background: Understanding immunoreactivity against SARS-CoV-2 provides a basis for the pathophysiology of COVID-19 while also providing a means to confirm the disease and reduce its transmission. Methods: The present cross-sectional study was conducted from February 1st, 2020 to December 30th, 2022. The patients’ characteristics, clinical and laboratory data, Polymerase Chain Reaction (PCR) results, and the presence of anti-SARS-CoV-2 antibodies (serology testing) were recorded. Results: A total of 182 children were included. PCR returned positive in 60.4%, while serology indicated infection in 86.4% of the participants. Sex as a factor was not significantly associated with the results of either of the tests. However, seropositive children were older (p &lt; 0.001), while PCR-positive children were younger (p &lt; 0.01). Those who presented with cough (p &lt; 0.05) or Multisystem Inflammatory Syndrome (MIS-C) (p &lt; 0.05) had higher seropositivity rates than those without. In contrast, those who presented with fever (p &lt; 0.001) or seizures (p &lt; 0.01) had higher chances of having a positive PCR for COVID-19. In individuals suffering from arthralgia, limping, or arthritis, positive serology was observed in 96.3%, 95.2%, and 96.9%, respectively. However, positive results from PCR were observed in 67.2%, 67.1%, and 30.3% of the mentioned individuals, respectively. Conclusion: Anti-SARS-CoV-2 serology is a valuable diagnostic tool in individuals presenting late with arthralgia, arthritis, limping, MIS-C, or other delayed presentations, especially when PCR returns negative for the virus.

The seroprevalence of toxocariasis and related risk factors in children in Ho Chi Minh City, Vietnam: results from a school-based cross-sectional study.

Children are especially vulnerable to Toxocara infection and its severe complications; however, there have not been any published data on the disease prevalence and treatment effectiveness in the population of Vietnamese children. This study was conducted to determine the prevalence of toxocariasis and explore factors associated with Toxocara infection in children aged 3-15 y in Ho Chi Minh City, Vietnam. We conducted a cross-sectional study using a multistage cluster sampling approach in public schools. Blood samples were collected, and toxocariasis cases were confirmed, based on a history of contact with dogs/cats and positive anti-Toxocara antibody detection via ELISA. We calculated the percentage of seropositive children across gender, grade levels, districts and caregiver education. Multiple regression models were employed to identify potential risk factors. Anti-Toxocara antibodies were found in 14.2% of the 986 children studied. Significant variations in seropositivity were observed across grade levels, districts and caregiver education levels. Multivariable analysis identified caregiver education, contact with dogs/cats and improper handling of pet feces as seropositivity risk factors. This was the first community-based prevalence study of toxocariasis in a pediatric population in Vietnam. Implementation of preventive measures such as public education, routine fecal examinations and chemotherapeutic treatment of animals is highly recommended.

Schistosomiasis Seroprevalence among Children Aged 0-14 Years in Nigeria, 2018.

The first nationally representative, population-based study of schistosomiasis seroprevalence in Nigeria was conducted using blood samples and risk-factor data collected during the 2018 Nigeria HIV/AIDS Indicator and Impact Survey (NAIIS). Schistosomiasis seroprevalence was estimated by analyzing samples for reactivity to schistosome soluble egg antigen (SEA) in a multiplex bead assay; NAIIS survey data were assessed to identify potential risk factors for seropositivity. The SEA antibody data were available for 31,459 children aged 0 to 14 years. Overall seroprevalence was 17.2% (95% CI: 16.3-18.1%). Seropositive children were identified in every age group, including children < 5 years, and seroprevalence increased with increasing age (P < 0.0001). Several factors were associated with increased odds of seropositivity, including being a boy (odds ratio [OR] = 1.34, 95% CI: 1.24-1.45), living in a rural area (OR = 2.2, 95% CI: 1.9-2.5), and animal ownership (OR = 1.67, 95% CI: 1.52-1.85). Access to improved sanitation and drinking water sources were associated with decreased odds of seropositivity (OR = 0.52, 95% CI: 0.47-0.58 and OR = 0.53, 95% CI: 0.47-0.60, respectively) regardless of whether the child lived in a rural (sanitation: adjusted odds ratio [aOR] = 0.7, 95% CI: 0.6-0.8; drinking water: aOR = 0.7, 95% CI: 0.6-0.8) or urban area (sanitation: aOR = 0.6, 95% CI: 0.5-0.7; drinking water: aOR = 0.5, 95% CI: 0.4-0.6), highlighting the importance of these factors for schistosomiasis prevention and control. These results identified additional risk populations (children < 5 years) and a new risk factor (animal ownership) and could be used to monitor the impact of control programs.

Comparing the immune abnormalities in MIS-C to healthy children and those with inflammatory disease reveals distinct inflammatory cytokine production and a monofunctional T cell response

Multisystem inflammatory syndrome in children (MIS-C) is a severe, hyperinflammatory disease that occurs after exposure to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The underlying immune pathology of MIS-C is incompletely understood, with limited data comparing MIS-C to clinically similar paediatric febrile diseases at presentation. SARS-CoV-2-specific T cell responses have not been compared in these groups to assess whether there is a T cell profile unique to MIS-C. In this study, we measured inflammatory cytokine concentration and SARS-CoV-2-specific humoral immunity and T cell responses in children with fever and suspected MIS-C at presentation (n = 83) where MIS-C was ultimately confirmed (n = 58) or another diagnosis was made (n = 25) and healthy children (n = 91). Children with confirmed MIS-C exhibited distinctly elevated serum IL-10, IL-6, and CRP at presentation. No differences were detected in SARS-CoV-2 spike IgG serum concentration, neutralisation capacity, antibody dependant cellular phagocytosis, antibody dependant cellular cytotoxicity or SARS-CoV-2-specific T cell frequency between the groups. Healthy SARS-CoV-2 seropositive children had a higher proportion of polyfunctional SARS-CoV-2-specific CD4+ T cells compared to children with MIS-C and those with other inflammatory or infectious diagnoses, who both presented a largely monofunctional SARS-CoV-2-specific CD4+ T cell profile. Treatment with steroids and/or intravenous immunoglobulins resulted in rapid reduction of inflammatory cytokines but did not affect the SARS-CoV-2-specific IgG or CD4+ T cell responses in MIS-C. In these data, MIS-C had a unique cytokine profile but not a unique SARS-CoV-2 specific humoral or T cell cytokine response.

Distinct T cell polyfunctional profile in SARS-CoV-2 seronegative children associated with endemic human coronavirus cross-reactivity

SARS-CoV-2 infection in children typically results in asymptomatic or mild disease. There is a paucity of studies on SARS-CoV-2 antiviral immunity in African children. We investigated SARS-CoV-2-specific Tcell responses in 71 unvaccinated asymptomatic South African children who were seropositive or seronegative for SARS-CoV-2. SARS-CoV-2-specific CD4+ Tcell responses were detectable in 83% of seropositive and 60% of seronegative children. Although the magnitude of the CD4+ Tcell response did not differ significantly between the two groups, their functional profiles were distinct, with SARS-CoV-2 seropositive children exhibiting a higher proportion of polyfunctional Tcells compared to their seronegative counterparts. The frequency of SARS-CoV-2-specific CD4+ Tcells in seronegative children was associated with the endemic human coronavirus (HCoV) HKU1 IgG response. Overall, the presence of SARS-CoV-2-responding Tcells in seronegative children may result from cross-reactivity to endemic coronaviruses and could contribute to the relative protection from disease observed in SARS-CoV-2-infected children.

2655. Phase 1 Safety and Immunogenicity Results of Two Investigational mRNA Vaccines, mRNA-1345, a Respiratory Syncytial Virus Vaccine, and mRNA-1653, a Human Metapneumovirus and Parainfluenza Virus Type 3 Combination Vaccine in Seropositive Young Children

Abstract Background Respiratory syncytial virus (RSV), human metapneumovirus (hMPV), and parainfluenza virus type 3 (PIV3) are common respiratory illnesses in children. Two investigational vaccines, mRNA-1345, encoding the RSV prefusion stabilized F (preF) glycoprotein, and mRNA-1653, encoding the hMPV and PIV3 F glycoproteins, are in clinical trials. Methods Two phase 1, randomized, observer-blind, placebo-controlled trials in children aged 12-59 months assessed safety and immunogenicity of mRNA-1345 (NCT04528719) and mRNA-1653 (NCT04144348). In the mRNA-1345 trial, RSV-seropositive children (N=46) were randomized to receive 3 doses of mRNA-1345 (15 µg or 30 µg) or placebo 2 months apart. In the mRNA-1653 trial, hMPV- and PIV3-seropositive children (N=27) were randomized to receive 2 doses of mRNA-1653 (10 µg or 30 µg) or placebo 2 months apart. Interim data through Month (M) 5 for mRNA-1345 and M3 for mRNA-1653 are reported. Results mRNA-1345 and mRNA-1653 were well-tolerated. The most frequently reported solicited local adverse reaction (AR) was tenderness at injection site (mRNA-1345, 35.7%-71.4%; placebo, 26.7%-42.9% and mRNA-1653, 44.4%-60.0%; placebo, 12.5%-30.0%); solicited systemic ARs (mRNA-1345, 12.5%-53.3%; placebo, 33.3%-50.0% and mRNA-1653, 33.3%-55.6%; placebo, 12.5%-60.0%) were mostly grade 1/2. One mRNA-1345 injection boosted RSV neutralizing antibody (nAb) titers (geometric mean fold rise [GMFR] over baseline: RSV-A=18.9-34.9; RSV-B=7.2-14.3) and RSV preF and postF binding antibody (bAb) concentrations (GMFR: preF=13.9-26.5; postF=9.3-16.0); additional injections did not further elevate antibody levels (Fig 1A and 2A). One mRNA-1653 injection boosted hMPV and PIV3 nAb titers (GMFR over baseline: hMPV-A=2.9-6.1; hMPV-B=6.2-13.2; PIV3=2.8-3.0) and preF and postF bAb concentrations (GMFR: hMPV preF=5.3-6.1; postF=4.6-6.5 and PIV3 preF=13.9-14.2; postF=11.0-12.1); a second injection did not further increase antibody levels (Fig 1B,C and 2B,C). In both trials, bAb responses were generally preF biased. Conclusion In seropositive children aged 12-59 months, mRNA-1345 and mRNA-1653 were well-tolerated and boosted RSV and hMPV plus PIV3 antibodies, respectively, supporting their continued development and that of a combination RSV and hMPV vaccine. Disclosures Matthew D. Snape, MBBS, MD, FRCPCH, FPM, FMedSci, Moderna Biotech UK, Inc.,: Employee|Moderna Biotech UK, Inc.,: Stocks/Bonds Sabine Schnyder Ghamloush, MD, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Grace L. Chen, MD, MPH, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Rakesh Dhar, MD, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Runa Mithani, PharmD, Moderna, Inc: Employee|Moderna, Inc: Stocks/Bonds Vinicius Righi, PharmD, MBA, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Louie Morsy, BS, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Archana Kapoor, PhD, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Bethany Girard, Ph.D., Moderna, Inc.: salary|Moderna, Inc.: Stocks/Bonds Laila El Asmar, PhD, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds Christine A. Shaw, PhD, Moderna, Inc.: Employee|Moderna, Inc.: Stocks/Bonds

Fertility desire and associated factors among women of reproductive age living with HIV/AIDS attending antiretroviral therapy clinic in Arba Minch General Hospital, South Ethiopia, 2021.

The fertility desire of women living with HIV to have children can have significant implications for public health. Despite the increase in the number of HIV-positive women, the issues of their fertility desire have not been well-studied. This study aims to assess fertility desire and associated factors among women living with HIV/AIDS. A facility-based cross-sectional study was conducted from 1 May to 30 July 2021. The researchers employed a systematic sampling technique. The data were gathered and entered into EpiData 3.1 software, and subsequently exported to the statistical package for social science version 25 for analysis. Binary logistic regression analyses were used to identify the factors involved, and a p-value of <0.05 at a 95% confidence level was deemed to be statistically significant. The findings of this study indicate that 47.8% of women expressed a desire to conceive. Various factors such as parents' pressure [adjusted odds ratio (AOR) = 4.41, 95% confidence interval (CI): 2.15-9.05], community pressure (AOR = 2.62, 95% CI: 1.30-5.26), being married (AOR = 0.25, 95% CI: 0.09-0.73), having only female offspring (AOR = 2.57, 95% CI: 1.12-5.90), and having HIV seropositive children (AOR = 2.45, 95% CI: 1.23-4.85) had statistically significant association with fertility desire. The study area exhibited a high level of fertility desire. Various factors can influence fertility desire, including parents' pressure, community pressure, being married, having only female offspring, and having children who are HIV seropositive. When developing interventions on sexual and reproductive health issues, it is imperative for policymakers and healthcare providers who are working in antiretroviral therapy clinics to take into account the effects of these factors on women living with HIV. When designing and implementing prevention of mother-to-child transmission services, it is important to consider the fertility desires of mothers who are living with HIV.

Humoral immune response to SARS-CoV-2 and endemic coronaviruses in urban and indigenous children in Colombia

BackgroundAlthough anti-SARS-CoV-2 humoral immune responses and epidemiology have been extensively studied, data gaps remain for certain populations such as indigenous people or children especially in low- and middle-income countries. To address this gap, we evaluated SARS-CoV-2 seroprevalence and humoral immunity towards the parental B.1 strain, local SARS-CoV-2 variants, and endemic coronaviruses in children from Colombia from March to April 2021.MethodsWe performed a cross-sectional seroprevalence study with 80 children from Bogotá and expanded our analysis by comparing results with an independent observational study of 82 children from the Wiwa community living in the north-eastern Colombian territories. Antibody IgG titers towards SARS-CoV-2 and the endemic coronaviruses as well as ACE2 binding inhibition as a proxy for neutralization towards several SARS-CoV-2 variants were analyzed using two multiplex-based immunoassays.ResultsWhile we find seroprevalence estimates of 21.3% in children from Bogotá, seroprevalence is higher with 34.1% in Wiwa children. We observe a robust induction of antibodies towards the surface-exposed spike protein, its S1-, S2- and receptor-binding-subdomains in all SARS-CoV-2 seropositive children. Only nucleocapsid-specific IgG is significantly lower in the indigenous participants. ACE2 binding inhibition is low for all SARS-CoV-2 variants examined. We observe a dominance of NL63 S1 IgG levels in urban and indigenous children which suggests an early exposure to this respiratory virus independent of living conditions and geographic location. SARS-CoV-2 seropositivity does not correlate with antibody levels towards any of the four endemic coronaviruses indicating the absence of cross-protective immunity.ConclusionsOverall, antibody titers, but in particular ACE2 binding inhibition are low within Colombian samples, requiring further investigation to determine any potential clinical significance.

Prevalence and pattern of soil transmitted intestinal helminth infections amongst HIV infected children in a tertiary hospital south eastern, Nigeria

Objective: Soil-transmitted helminth infections (STHI) coexist with human immunodeficiency virus (HIV) infection, and they are widespread in environments where poverty is endemic. Helminths upregulate immunological stimulation while HIV’s effect is down-regulatory, depicted by the increased incidence of hypersensitivity drug reactions in advanced HIV/AIDS. Hypobiosis (a state of dormancy in the host with the capability of reactivation and establishing intestinal infection over long periods) among helminths is accentuated in the presence of a low CD4 count. This makes HIV-positive patients often have a higher load of helminths. The study sought to determine the pattern, prevalence, and specie specific prevalence of intestinal helminthiasis in children living with HIV and HIV seronegative controls. Material and Methods: This was a comparative cross-sectional study, conducted amongst 256 sero-positive children, and 268 matched controls recruited into the study between October and December 2022. Subjects were excluded if they had been given any antihelminth in the six weeks preceding enrollment. Data were collected using a structured interviewer-administered questionnaire. Fresh stool samples were analyzed using the Kato-Katz method. Results: The prevalence of intestinal helminthiasis in children living with HIV was 47.7% and 36.6% amongst the sero-negative control population (p = 0.7589). Among the subjects and controls, the highest prevalence was seen in the 5-9 year age group, while those over 15 years had the lowest prevalence. These differences in the prevalence of helminths infection amongst the various age groups were significant in the subjects only and not in the controls. Of all the STHI, Hookworm infection constituted the majority 52.5%. Multiple STHI were seen in 20.7% of subjects living with HIV, while 9.3% were seen in the control. The difference is statistically significant (p = .00003). Conclusion: Soil-transmitted helminthic infection is more prevalent in children living with HIV than in apparently healthy children. Regular deworming should be considered in the care of children living with HIV.

Increased red blood cell deformation in children and adolescents after SARS-CoV-2 infection

Severe coronavirus disease 2019 (COVID-19) is associated with hyperinflammation, hypercoagulability and hypoxia. Red blood cells (RBCs) play a key role in microcirculation and hypoxemia and are therefore of special interest in COVID-19 pathophysiology. While this novel disease has claimed the lives of many older patients, it often goes unnoticed or with mild symptoms in children. This study aimed to investigate morphological and mechanical characteristics of RBCs after SARS-CoV-2 infection in children and adolescents by real-time deformability-cytometry (RT-DC), to investigate the relationship between alterations of RBCs and clinical course of COVID-19. Full blood of 121 students from secondary schools in Saxony, Germany, was analyzed. SARS-CoV-2-serostatus was acquired at the same time. Median RBC deformation was significantly increased in SARS-CoV-2-seropositive compared to seronegative children and adolescents, but no difference could be detected when the infection dated back more than 6 months. Median RBC area was the same in seropositive and seronegative adolescents. Our findings of increased median RBC deformation in SARS-CoV-2 seropositive children and adolescents until 6 months post COVID-19 could potentially serve as a progression parameter in the clinical course of the disease with an increased RBC deformation pointing towards a mild course of COVID-19.

COVID-19 Seroprevalence in Children during Pandemic Waves in Sarajevo, a Single Center Experience.

The aim of this study was to present data on the prevalence of seropositive children tested in the laboratory of the Eurofarm polyclinic in Sarajevo, from September 2020 to May 2021. Peripheral blood samples were collected and anti-SARS-CoV-2 antibodies were detected using an electrochemiluminescence immunoassay. In the total of 762 tested children, 187 were positive (24.5%), based on cut-off value. Of all the positive cases 42.8% were female while 57.2% were male. There were 10.1% of positive children in the first age group (0-5 years), 44.4% in the second group (6-13 years), and 45.5% in the third group (14-18 years). There was no statistically significant difference in seroprevalence between age groups and gender. The lowest seroprevalence (3.6%) was observed in October 2020 after the first pandemic wave, and the highest seroprevalence (60.3%) was observed in April 2021, corresponding to the third pandemic wave. The results of our study showed that the seroprevalence in children was low, especially during the first year of the pandemic. In the second year of the pandemic, there was an evident statistically significant increase in the number of seropositive children. Similar data have been shown in studies for adults.

Distinctive Kaposi Sarcoma-Associated Herpesvirus Serological Profile during Acute Plasmodium falciparum Malaria Episodes.

The seroprevalence of Kaposi sarcoma-associated herpesvirus (KSHV) and the incidence of endemic Kaposi sarcoma (KS) overlap with regions of malaria endemicity in sub-Saharan Africa. Multiple studies have shown an increased risk of KSHV seroconversion in children from high malaria compared to low malaria regions; however, the impact of acute episodes of Plasmodium falciparum (P. falciparum) malaria on KSHV's biphasic life cycle and lytic reactivation has not been determined. Here, we examined KSHV serological profiles and viral loads in 134 children with acute malaria and 221 healthy children from high malaria regions in Kisumu, as well as 77 healthy children from low malaria regions in Nandi. We assayed KSHV, Epstein-Barr virus (EBV), and P. falciparum malaria antibody responses in these three by multiplexed Luminex assay. We confirmed that KSHV seroprevalence was significantly associated with malaria endemicity (OR = 1.95, 1.18-3.24 95% CI, p = 0.01) with 71-77% seropositivity in high-malaria (Kisumu) compared to 28% in low-malaria (Nandi) regions. Furthermore, KSHV serological profiles during acute malaria episodes were distinct from age-matched non-malaria-infected children from the same region. Paired IgG levels also varied after malaria treatment, with significantly higher anti-ORF59 at day 0 but elevated ORF38, ORF73, and K8.1 at day 3. Acute malaria episodes is characterized by perturbation of KSHV latency in seropositive children, providing further evidence that malaria endemicity contributes to the observed increase in endemic KS incidence in sub-Saharan Africa.

Assessment of herd immunity to hepatitis A virus among the population of the Republic of Tatarstan

Introduction. Identification of the groups of the population most susceptible to infection with hepatitis A virus (HAV) is a key component for the regulation of anti-epidemic measures during the activation of the epidemic process.&#x0D; The aim аssessment of the herd immunity to hepatitis A (HA) among different age groups of the population of the Republic of Tatarstan.&#x0D; Materials and methods. The analysis of the HA incidence of from 2006 to 2021 and the study of herd immunity to HA among 6,553 persons from different age groups that were not vaccinated against HA were carried out. Participants with protective concentrations of antibodies to HAV of 20 mMU/ml or more were considered as seropositive.&#x0D; Results. The analysis showed a low intensity of the epidemic process in general (3.6 0.3о/оооо), while the HA incidence among children and adults was significantly different, with incidence rates 2.3 times higher in the first group (6.9 0.9 and 3.0 0.3о/оооо, respectively). The epidemic process is determined by persons aged 1517 years (8.2 2.5о/оооо), 36 years (7.0 1.9о/оооо, 714 years (6.2 1.3о/оооо), the incidence among these age groups in all observed years remained the highest. In general, the proportion of seropositive children was 32.1 1.0%. Among adults, anti-HAV IgG antibodies in a protective concentration was detected in 68.2 0.7%. The highest frequency of anti-HAV IgG positive samples was observed among persons aged 5059 years 89.4 1.1%, in age group 4049 years 73.5 1.2%, in age group 3039 years 65.5 1.3%, and in age group 2029 years 48.2 1.6%. In total, 56.9 0.6% of the examined individuals had protective antibodies to HAV. The detection rates of anti-HAV IgG antibodies were significantly different in all age groups (p 0.05).