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Predominance of Human Bocavirus Genotype 1 and 3 in Outpatient Children with Diarrhea from Rural Communities in South Africa, 2017-2018.Human bocavirus (HBoV) is an emerging virus globally associated with diarrhea in young children. This study aims to investigate the prevalence of HBoV genotypes in children (≤5 years) from rural communities in South Africa (SA) suffering from acute gastroenteritis (AGE). A total of 141 fecal samples of children ≤5 years with acute gastroenteritis (AGE) were collected from rural primary health care facilities in the Vhembe district of SA between June 2017 and July 2018. Clinical symptoms and demographic data were also recorded. A total of 102 (72%) were outpatients, and 39 (28%) were hospitalized patients. Human bocavirus (HBoV) genotypes were determined using real-time multiplex PCR. DNA extracts of positive samples were confirmed by conventional PCR targeting the NS1 gene. Co-infection with other enteric viruses were determined in HBoV-positive samples using real-time PCR. HBoV was detected in eight (5.7%) children with AGE, of which three (37.5%) were HBoV1, three (37.5%) were HBoV3, and two (25%) were HBoV2. The majority of positive cases were identified in outpatients (62%) between the ages of 1 and 24 months. Co-infection in HBoV-positive samples with other enteric viruses included rotavirus (37.5%), adenovirus (37.5%), norovirus (25%), and astrovirus (12.5%). HBoV infections could be seen as a potential emerging diarrheal pathogen in South Africa. However, more studies are needed to understand the role of HBoV infections in children with AGE.
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Assessment of the long-term efficacy of a dengue vaccine against symptomatic, virologically-confirmed dengue disease by baseline dengue serostatus.CYD-TDV is a live, attenuated, tetravalent dengue vaccine licensed in 21 countries. We undertook a post-hoc analysis of the long-term efficacy of CYD-TDV during the surveillance expansion phase (SEP) of two Phase III studies (CYD14 in the Asia-Pacific region; CYD15 in Latin America). The SEP included approximately Year 5 and the entire Year 6 of follow-up after the first study injection. Vaccine efficacy against symptomatic virologically-confirmed dengue (VCD) was assessed by participant age (any age, ≥9, <9, 2-5, and 6-8 years at the time of the first injection) and baseline dengue serostatus using a case-cohort framework. Baseline dengue serostatus was estimated by several methods including logistic regression-based multiple imputation (MI) to predict PRNT with key predictor being Month 13 (M13) anti-non-structural protein (NS1) titers; superlearner-based imputation by targeted minimum loss based estimation (TMLE); and M13 anti-NS1 titer threshold 9 EU/mL (NS1 M13). There were 436 symptomatic VCD cases (CYD14: n = 360; CYD15: n = 76) during the SEP. Vaccine efficacy in seropositive participants aged ≥9 years was assessed by MI (47.9% [95% CI 19.4; 66.3]), TMLE (53.0% [95% CI 23; 71]), and NS1 M13 (52.4% [95% CI 30.8; 67.3]). Vaccine efficacy estimates were lower in seropositive individuals aged <9 years compared with individuals ≥9 years. Among seropositive individuals aged 2-5 and 6-8 years, vaccine efficacy across the different approaches for assessing serostatus ranged from between -25.7 to 36.9% and 44.4 to 64.7% during the SEP, respectively. In the pooled CYD14/15 data of seronegatives, vaccine efficacy was null to modest. In conclusion, CYD-TDV was shown to maintain efficacy against symptomatic VCD in seropositive participants aged ≥9 years up to six years after the first dose. Persistence of efficacy was also observed in seropositive participants aged 6-8 years.
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Flow-cytometry detection of fluorescent magnetic nanoparticle clusters increases sensitivity of dengue immunoassay.We report a flow-cytometry based method capable of detecting a range of analytes by monitoring the analyte-induced clustering of magnetic and fluorescent nanoparticles with flow cytometry. Using the dengue viral antigen (NS1) as an example, antibodies were conjugated to magnetic and fluorescent nanoparticles in a sandwich immunoassay format. These nanoparticles formed clusters when NS1 was present in a sample and the cluster formation was directly proportional to the concentration of antigen. Simultaneous flow cytometry measurement of cluster size, as detected by the forward scatter channel, combined with fluorescence intensity led to a reduction in the assay background signal, resulting in improved analytical sensitivity. We were able to detect 2.5 ng mL of NS1 in serum samples by quantifying the clusters, a two-log fold improvement in the assay limit of detection over total fluorescence quantification alone.
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Formulation and evaluation of cyclodextrin-based nanosponges of griseofulvin as pediatric oral liquid dosage form for enhancing bioavailability and masking bitter taste.The aim of this study was the development of griseofulvin (GRI) loaded β-cyclodextrin (β-CD) based nanosponges for bitter taste masking, improving dissolution rate and oral bioavailability. Plain NS (NS1 NS2 and NS3) were fabricated by reacting β-CD with the cross-linker diphenyl carbonate at different molar ratios (1:2, 1:4 and 1:6, respectively) using ultrasonication method. The NS2 provided both highest %yield and GRI solubilization enhancement. Thus, the drug was loaded in NS2 at different NS2: drug weight ratios in presence or absence of 0.25%w/w polyvinylpyrolidone (PVP k30). The GRI loaded NS (F1) that provided highest drug loading capacity and entrapment efficiency (47.20 0.38%, 84.91 ± 0.30%, respectively) was morphologically examined using scanning electron microscopy (SEM). Also, Particle size, zeta potential, differential scanning calorimetry (DSC), Fourier transform infra-red (FT-IR), nuclear magnetic resonance (NMR) spectroscopy, release, taste masking potential were evaluated. Moreover, Pharmacokinetic studies were performed on rats. The F1 showed particle size 665.9 ± 13.8 nm and zeta potential -21.5 ± 0.7 mV. The DSC and FT-IR analysis confirmed the complexation of GRI with NS2. Nanosponges (F1) provided 3.19, folds increase in dissolution efficiency %, 2.13 and 3.78 folds increase in C and AUC compared to plain GRI. Taste masking evaluation confirmed the potential of GRI nanosponges (F1) in masking the bitter taste of GRI completely. The study confirmed that complexation of GRI with NS would be a viable approach for masking the bitter taste of GRI and improving oral bioavailability, that Cmax, Tmax and AUC 0-48 were significantly higher for the developed formulation (F1).
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Clinical, Virological, and Cytokine Profiles of Children Infected with Dengue Virus during the Outbreak in Southern Vietnam in 2017.Dengue virus (DENV) infection is a major cause of morbidity and mortality in Vietnam, and the incidence is higher and more consistent in the southern part of the country. This study investigated the circulation of DENV serotypes, viremia levels, immunological status, and cytokine levels, with disease severities among children infected in 2017 in Ho Chi Minh City, Southern Vietnam. Acute and convalescent serum samples were collected from clinically diagnosed dengue children. They were confirmed to have DENV infection by NS1 antigen, IgM and IgG ELISAs, virus isolation, and conventional and real-time RT-PCR. Measurement of 10 cytokine levels was performed in the serum samples. All the children were dengue IgM positive; 28% and 72% of them had primary and secondary DENV infections, respectively, whereas 54% of those with secondary infection were children with dengue with warning signs and with severe dengue. Any or mixed infection of the four serotypes of DENV RNA was detected in 58 children. Twenty DENV strains (DENV-1 = 16 and DENV-4 = 4) were isolated. Levels of IFN-γ, TNF-α, MCP-1, IL-10, and IL-6 were significantly higher in severe dengue cases. We report the predominance of DENV-1 over other serotypes in the 2017 dengue outbreak in Southern Vietnam. Our data showed that cytokine expressions were correlated with dengue pathogenesis and may help in identifying an effective therapeutic strategy.
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Interferon- Stimulation Elicited by the Influenza Virus Is Regulated by the Histone Methylase Dot1L through the RIG-I-TRIM25 Signaling Axis.Influenza virus infection increases the methylation of lysine 79 of histone 3 catalyzed by the Dot1L enzyme. The role of Dot1L against infections was highlighted by an increase of influenza A and vesicular stomatitis virus replication in Dot1L-inhibited cells mediated by a decreased antiviral response. Interferon-beta (IFN-β) reporter assays indicate that Dot1L is involved in the control of retinoic acid-inducible geneI protein (RIG-I) signaling. Accordingly, Dot1L inhibition decreases the IFN-β promoter stimulation and RIG-I- mitochondria-associated viral sensor (RIG-I-MAVS) association upon viral infection. Replication of an influenza A virus lacking NS1 (delNS1), incapable of counteracting the antiviral response, is not affected by Dot1L inhibition. Consequently, RIG-I-MAVS association and nuclear factor-B (NF-κ nuclear translocation, are not affected by the Dot1L inhibition in delNS1 infected cells. Restoration of NS1 expression in also reinstated Dot1L as a regulator of the RIG-I-dependent signaling in delNS1 infections. Interferon-inducible E3 ligase tripartite motif-containing protein 25 ( expression increases in influenza virus infected cells, but Dot1L inhibition reduces both the expression and TRIM25 protein levels. overexpression reverses the defective innate response mediated by Dot1L inhibition elicited upon virus infection or by overexpression of RIG-I signaling intermediates. Thus, TRIM25 is a control point of the RIG-I recognition pathway controlled by Dot1L and may have a general role in RNA viruses recognized by the RIG-I sensor.
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Assessment of diagnostic and analytic performance of the SD Bioline Dengue Duo test for dengue virus (DENV) infections in an endemic area (Savannakhet province, Lao People's Democratic Republic).Rapid tests detecting both dengue virus (DENV) NS1 antigen and anti-DENV IgM and IgG antibodies facilitate diagnosis of dengue fever (DF) in resource-poor settings.
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Identification and Characterization of Bluetongue Virus Serotype 14 in Russia.This paper reports a case of bluetongue virus (BTV) infection in the Smolensk and Kaluga regions of Russia in 2011-2012. The virus was initially detected in heifers transferred in Russia from Germany through Poland and Belarus in 2011. On day 27 of quarantine, RNA and infectious viruses of BTV were detected in four heifers, but five were serologically positive. However, on day 3 before shipment, all heifers were seronegative and PCR-negative for BTV. Thus, a few animals from this consignment were viremic without any evident subclinical infection. Based on Seg-2 (VP2 gene) and Seg-5 (NS1 gene) sequencing, the recovered virus had 99.86-100% nucleotide identity with BTV-14-like viruses such as the vaccine BTV-14 strain RSArrrr/BTV 14 and the BTV-14 isolates detected in Lithuania and Poland in 2012. Subsequently, BTV-14 was also reported in local animals in two regions of Russia. During the monitoring survey, 1623 local animals within a 300-km radius were tested, of which 471 tested positive by ELISA and 183 by PCR for BTV-14 RNA. No other serotypes were identified in either imported or aboriginal animals within that radius. The midges trapped at the site of the outbreak in May 2012 tested positive for the BTV-14 genome, indicating that the possible mechanism of spread most likely occurs via vector bites. However, further investigation is required to confirm this hypothesis, which would provide an improved understanding of the circulation and overwintering of BTV in northern latitudes.
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Influenza A virus lacking the effector and C terminal domains of NS1 protein induces cytokines associated with high pathogenicity in mice.Non-structural NS1 protein of influenza A virus counters host antiviral defences by antagonizing the interferon response. The C-terminal effector domain suppresses the host response and is associated with the pathogenicity of the virus. To better understand the regulatory role of the C-terminal domain, we used reverse genetics system to generate NS1-truncated virus (NS80) and compared the cytokine profiles in the lungs of mice infected with the NS80 mutant and with the control virus A/WSN/33 (WSN). The NS80 virus was attenuated and the viral titer in the lungs was about 25 times lower than viral titer of control A/WSN/33. Mice infected with NS80 virus exhibited more severe clinical symptoms and 2 mice died 6 days post infection. NS80 virus activated retinoic-inducible gene (RIG)-1-like receptor signaling pathway more strongly than control WSN virus and mice infected with NS80 virus exhibited a greater abundance and more diverse cytokine profile. Infection with NS80 virus induced the expression of the following factors: pro-inflammatory cytokines (IL-1α, IL-1β, TNF-α, IL-16), interferons (IFN-α and IFN-ε), chemokines (CCL2, CCL11, CXCL1, CXCL5, CXCL10, CXCL11 and CXCL13), matrix metallopeptidase 9 (MMP-9), metallopeptidase inhibitor 1 (TIMP-1), macrophage colony-stimulating factor (M-CSF), and vascular cell adhesion protein 1 (VCAM-1). All these cytokines are associated with viral pathogenicity. Our data show that attenuation of the virus should not be directly linked with pathogenicity. Keywords: influenza virus; NS1 protein; cytokines; interferon; pathogenicity.
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