Tigray Orthohantavirus Infects Two Related Rodent Species Adapted to Different Elevations in Ethiopia.
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ABSTRACT:
SUBMITTER: Meheretu Y
PROVIDER: S-EPMC6882452 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:Orthohantaviruses are rodent-borne emerging viruses that may cause severe diseases in humans but no apparent pathology in their small mammal reservoirs. However, the mechanisms leading to tolerance or pathogenicity in humans and persistence in rodent reservoirs are poorly understood, as is the manner in which they spread within and between organisms. Here, we used a range of cellular and molecular approaches to investigate the interactions of three different orthohantaviruses-Puumala virus (PUUV), responsible for a mild to moderate form of hemorrhagic fever with renal syndrome in humans, Tula virus (TULV) with low pathogenicity, and non-pathogenic Prospect Hill virus (PHV)-with human and rodent host cell lines. Besides the fact that cell susceptibility to virus infection was shown to depend on the cell type and virus strain, the three orthohantaviruses were able to infect Vero E6 and HuH7 human cells, but only the former secreted infectious particles. In cells derived from PUUV reservoir, the bank vole (Myodes glareolus), PUUV achieved a complete viral cycle, while TULV did not enter the cells and PHV infected them but did not produce infectious particles, reflecting differences in host specificity. A search for mature virions by electron microscopy (EM) revealed that TULV assembly occurred in part at the plasma membrane, whereas PHV particles were trapped in autophagic vacuoles in cells of the heterologous rodent host. We described differential interactions of orthohantaviruses with cellular factors, as supported by the cellular distribution of viral nucleocapsid protein with cell compartments, and proteomics identification of cellular partners. Our results also showed that interferon (IFN) dependent gene expression was regulated in a cell and virus species dependent manner. Overall, our study highlighted the complexity of the host-virus relationship and demonstrated that orthohantaviruses are restricted at different levels of the viral cycle. In addition, the study opens new avenues to further investigate how these viruses differ in their interactions with cells to evade innate immunity and how it depends on tissue type and host species.
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Project description:Members in the genus Bocaparvovirus are closely related to human health and have a wide host range. The diverse hosts raise the possibility of crossing species barrier, which is a feature of emerging viruses. Among the mammalian hosts, rodents are generally acknowledged to be important reservoirs of emerging viruses. Here, rodent samples collected from six provinces and autonomous regions of China (Liaoning, Inner Mongolia, Tibet, Xinjiang, Guangxi and Yunnan) were used to investigate the prevalence and distribution of bocaparvoviruses. By using next-generation sequencing first, a partial non-structural protein 1 (NS1) gene belonging to a possible novel bocaparvovirus was discovered. Following this, PCR-based screening of NS1 gene was conducted in 485 rodent samples, with 106 positive results found in seven rodent species (Rattus norvegicus, Mus musculus, Apodemus agrarius, Cricetulus barabensis, Rattus flavipectus, Rattus rattus and Rhombomys opimus). Finally, six nearly full-length genomes and three complete CDS were obtained and the newly identified bocaparvovirus was tentatively named rodent bocavirus (RoBoV). RoBoV has three ORFs: NS1, NP1, and VP, which are characteristics of bocaparvoviruses. Phylogenetic analyses revealed that porcine bocavirus isolate PBoV-KU14, a member of Ungulate bocaparvovirus 4, was the most related virus to RoBoV, with 92.1-92.9% amino acid identities in NS1 protein. Alignments of RoBoV-related sequences showed RoBoV isolates could be classified into two clades, demonstrating an inter-host genetic diversity. The results indicate a potential interspecies transmission of RoBoV between rodents and swine and expand our knowledge on bocaparvoviruses in rodent populations.
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Project description:Differences in immune function between species could be a result of interspecific divergence in coding sequence and/or expression of immune genes. Here, we investigate how the degree of divergence in coding sequence and expression differs between functional categories of immune genes, and if differences between categories occur independently of other factors (expression level, pleiotropy). To this end, we compared spleen transcriptomes of wild-caught yellow-necked mice and bank voles. Immune genes expressed in the spleen were divided into four categories depending on the function of the encoded protein: pattern recognition receptors (PRR); signal transduction proteins; transcription factors; and cyto- and chemokines and their receptors. Genes encoding PRR and cyto-/chemokines had higher sequence divergence than genes encoding signal transduction proteins and transcription factors, even when controlling for potentially confounding factors. Genes encoding PRR also had higher expression divergence than genes encoding signal transduction proteins and transcription factors. There was a positive correlation between expression divergence and coding sequence divergence, in particular for PRR genes. We propose that this is a result of that divergence in PRR coding sequence leads to divergence in PRR expression through positive feedback of PRR ligand binding on PRR expression. When controlling for sequence divergence, expression divergence of PRR genes did not differ from other categories. Taken together, the results indicate that coding sequence divergence of PRR genes is a major cause of differences in immune function between species.
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Project description:BackgroundQuality intrapartum and newborn care is considered to be poor in Sub-Saharan Africa. However, studies done in Ethiopia are limited. Therefore, this study was conducted to assess the magnitude and factors associated with quality intrapartum and newborn care in Tigray, Northern Ethiopia.MethodsFacility based survey was conducted from December 2014 to February 2015 in Tigray, Northern Ethiopia. The quality of intrapartum care provided by a total of 106 skilled birth attendants to 216 labouring mothers and newborns were observed during childbirth in the health facilities. Standardized questionnaires and checklist were utilized to collect data. Quality of intrapartum service was measured using standard intrapartum criteria. Thus, good quality service was considered if the mother and newborn scored 75% or more of the intrapartum criteria during childbirth. Binary and multiple logistic regression model was used to determine the factors associated with quality intrapartum and newborn care services.Results29.2% of mothers and 67.6% newborns received good quality care during intrapartum and immediate postpartum periods respectively. However, only 47.2% of mothers and newborns received a friendly care during childbirths. The independent predictors of quality intrapartum and newborn care were the appropriate use of partograph (AOR 3.92; 95% CI 1.78, 8.63), friendly maternal and newborn care services (AOR 7.9; 95% CI 3.59, 17.33), more than two years working experience (AOR 0.31; 95% CI 0.13, 0.73) and using services in different Zones in the study area.ConclusionsThe quality intrapartum care is poor in the study area and it is associated with inappropriate use of partograph, unfriendly care, and experience of health providers. Scaling up obstetric service, continuous training and motivation of service providers and revising the criterion for accreditation of service providers are important.
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Project description:We report hepatitis E virus (HEV) outbreaks among refugees from Ethiopia in Sudan during June 2021-February 2022. We identified 1,589 cases of acute jaundice syndrome and used PCR to confirm HEV infection in 64% of cases. Implementing vaccination, water, sanitation, and hygiene programs might reduce HEV outbreak risk.
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Project description:The protozoan Entamoeba histolytica is the etiological agent of amoebiasis, which can spread to the liver and form amoebic liver abscesses. Histological studies conducted with resistant and susceptible models of amoebic liver abscesses (ALAs) have established that neutrophils are the first cells to contact invasive amoebae at the lesion site. Myeloperoxidase is the most abundant enzyme secreted by neutrophils. It uses hydrogen peroxide secreted by the same cells to oxidize chloride ions and produce hypochlorous acid, which is the most efficient microbicidal system of neutrophils. In a previous report, our group demonstrated that myeloperoxidase presents amoebicidal activity in vitro. The aim of the current contribution was to analyze in vivo the role of myeloperoxidase in a susceptible (hamsters) and resistant (Balb/c mice) animal models of ALAs. In liver samples of hamsters and mice inoculated intraportally with Entamoeba histolytica trophozoites, the number of neutrophils in ALAs was determined by enzymatic activity. The presence of myeloperoxidase was observed by staining, and its expression and activity were quantified in situ. A significant difference existed between the two animal models in the number of neutrophils and the expression and activity of myeloperoxidase, which may explain the distinct evolution of amoebic liver abscesses. Hamsters and mice were treated with an MPO inhibitor (4-aminobenzoic acid hydrazide). Hamsters treated with ABAH showed no significant differences in the percentage of lesions or in the percentage of amoebae damaged compared with the untreated hamsters. ABAH treated mice versus untreated mice showed larger abscesses and a decreased percentage of damaged amoebae in these lesion at all stages of evolution. Further studies are needed to elucidate the host and amoebic mechanisms involved in the adequate or inadequate activation and modulation of myeloperoxidase.
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Project description:Orthohantaviruses are rodent-borne emerging viruses known to cause severe diseases in humans but no apparent pathology in their small mammal reservoirs. However, the mechanisms leading to tolerance or pathogenicity in humans and persistence in rodent reservoirs are poorly understood, as is the manner in which they spread within and between organisms. Here, we used a range of cellular and molecular approaches to investigate the interactions of three different orthohantaviruses – Puumala virus (PUUV), responsible for a mild form of hemorrhagic fever in humans, Tula virus (TULV) with low pathogenicity, and nonpathogenic Prospect Hill virus (PHV) – with human and rodent host cell lines. We showed that the three orthohantaviruses were able to infect Vero E6 and HuH7 cells but only the former secreted infectious particles. In cells derived from the PUUV reservoir (Myodes glareolus), PUUV achieved complete viral cycling, while TULV did not enter the cells and PHV infected them but did not produce infectious particles, reflecting some differences in host specificity. A search for mature virions by electron microscopy revealed that TULV assembly occurred in part at the plasma membrane, whereas PHV particles were trapped in autophagic vacuoles in cells of the heterologous rodent host. The interaction of orthohantaviruses with cellular factors was investigated by studying the colocalization of viral nucleocapsids with markers of cell compartments, identifying interactors of viral proteins by mass spectrometry analysis, and measuring the regulation of gene expression by transcriptomic analysis in infected cells. Overall, our study highlighted the complexity of the host-virus relationship, demonstrated that orthohantaviruses were restricted at different levels of the viral cycle, and provided different levels of analysis to further investigate how these viruses differ in their interactions with cells to evade innate immunity and how this depends on the tissue and host species.
2022-10-04 | PXD032365 | Pride
Project description:IntroductionThe presence of medicines in households is a risk factor for irrational drug use. This study aimed at investigating the prevalence and factors associated with home storage of medicines in Tigray Region, Ethiopia.MethodA community based cross-sectional study was conducted in April 2013 in Tigray Region, Ethiopia. A total of 1034 participants were enrolled in the study. A multi-stage sampling method was employed to select households. Data were collected with the help of a pre-tested structured questionnaire and analyzed using descriptive statistics and bivariate and multivariate logistic regression.ResultOf the total households visited, 293(29%) stored drugs. The mean number of drugs per household was 1.73. The most common classes of drugs found in households were analgesics 149(29%) and antibiotics 128(25%). Most of the medicines kept in households were used for ongoing treatments 316(62%) and available in tablet dosage form (70%). More than half of the medications kept at homes were not adequately labeled while drawer 180(36%) were reported as the main place of drug storage. The proportion of home storage of medicines in rural area (AOR = 0.56, 95% CI: 0.39-0.81) was lower than that of urban area. However, households having family member(s) working in health facilities (AOR = 2.03, 95% CI: 1.09-3.77) were associated with an increased home storage of medicines.ConclusionMost drugs kept at home were not appropriately labeled and stored in a safe place. Residence area (rural versus urban) and the presence of health professional(s) in the households affects household drug storage. Hence, public education campaign should be considered as an intervention to improve the storage condition of medicines in the households.
| S-EPMC4537258 | biostudies-literature
Project description:INTRODUCTION:Neural tube defects are the major causes of fetal loss and considerable disabilities in infants. Currently, there is no significant research on the incidence of Neural tube defects in the Tigray region of Ethiopia. OBJECTIVE:To determine the incidence and clinical pattern of the Neural Tube Defects. METHODS:A hospital-based cross-sectional study was conducted from October 2016 to June 2017. All pregnancy outcomes were examined for any externally visible birth defects and neurological integrity by trained midwives under the supervision of senior obstetrics and gynecology and a neurosurgeon. Data were collected using a survey tool to collect maternal and newborn demographic data and a checklist developed to capture newborns with Neural Tube Defects. Data were analyzed using SPSS version 20. The prevalence of NTDs was calculated per 10,000 births. RESULT:Out of the 14,903 births during the study period, a total of 195 infants were born afflicted with Neural Tube Defects. The burden of infants with anencephaly and spina bifida was 66.4 and 64.4 per 10, 000 births, respectively. The overall incidence rate of NTDs in this study was 131 per 10, 000 births of which 23% were liveborn and 77% were stillborn. The highest burden of Neural Tube Defects was observed in Adigrat Hospital from Eastern Zone of Tigray (174 per 10,000 births) and Lemlem Karl Hospital from Southern Zone of Tigray (304 per 10,000 births) compared to Kahsay Abera Hospital from Western Zone (72.8 per 10,000 births) and Sihul Hospital from North Western Zone of Tigray (69.8 per 10,000 births). CONCLUSION AND RECOMMENDATION:Assuming that the non folic acid preventable rate should be 5 per 10,000 births, our prevalence rate is 131 per 10,000 births, and then we have a rate or an epidemic that is 26 times what it should be. This just emphasizes the urgency to implement effective programs to get all women of reproductive age to have adequate folic acid to prevent all of folic acid-preventable spina bifida and anencephaly, which would prevent 96% (125/130) of spina bifida and anencephaly in the Tigray Provence.
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