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Impact of a Mass Campaign on the Evolution of the Fourth Wave of the Covid-19 Pandemic in the Central African Republic

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Journal of Tuberculosis Research 2024年第3期12卷 142-150页

作者： Clotaire Donatien Rafaï Pierre Somse Wilfrid Sylvain Nambei Ernest Lango-Yaya Marie-Roseline Darnycka Belizaire Ulrich Vickos narcisse patrice komas Oscar Senzongo Luc Salva Heredeibona Ulrich Jeffrey Kotemossoua Rabbi Mermoz Senekian Simon Pounguinza Jephté Estimé Kaleb Christian-Diamant Mossoro-Kpinde Alain Le Faou Jean De Dieu Longo Norbert Richard Ngbale Abdoulaye Sepou François-Xavier Mbopi-Keou Gérard Grésenguet Boniface Koffi National Laboratory of Clinical Biology and Public Health Bangui Central African Republic Faculty of Health Sciences University of Bangui Bangui Central African Republic Ministry of Health and Population Bangui Central African Republic World Health Organization Bangui Central African Republic Pasteur Institute of Bangui Bangui Central African Republic Faculty of Medicine Midwifery and Health Professions University of Lorraine Nancy France Faculty of Medicine and Biomedical Sciences University of Yaounde I Yaounde Cameroun Community University Hospital Center of Bangui Bangui Central African Republic

Objective: In the context of increasing cases despite vaccination campaigns, a survey was conducted in the Bangui population from January 17 to 26, 2022, to evaluate the strains of Severe Acute Respiratory Infection Coronavirus 2 (SARS-Cov-2) circulating in a healthy population. Materials and methods: This study was conducted by taking nasopharyngeal samples from randomly selected volunteers. Antigen detection was performed systematically, and RT-PCR was done on the positive samples. Results and discussion: We collected 2,554 samples. Thirty were found RT-PCR positive (1.2%) and sent for viral genome sequencing. Twenty-eight SARS-Cov-2 strains belonged to the Omicron type, and only 2 to the Delta type. Conclusion: Thus, infections were uncommon in the tested population, but the presence of Omicron and Delta types raises concerns that vaccination may not be effective in fighting the virus, and newly designed vaccines should be implemented to better protect the population at risk of infection and reinfection by these variants.

关键词： COVID-19 SARS-CoV-2 Variants

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RETRACTED: Prevalence and Profile of Hepatitis B Virus Infection among HIV-Infected Adults at Panzi Referral Hospital, in the Post-Conflict South Kivu Province, Eastern Democratic Republic of Congo

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World Journal of AIDS 2019年第3期9卷 105-117页

作者： Parvine Basimane Bisimwa Dieudonné Bihehe Masemo Andre Bulabula Nyandwe Hamama Théophile Kashosi Mitima Aline Kusinza Byabène Tony Akilimali Shindano Sioban Harlow Jean Paulin Mbo Mukonkole narcisse patrice komas Jean Bisimwa Nachega Université Evangéliqueen Afrique (UEA) Bukavu Democratic Republic of Congo International Center Advanced for Research and Training (ICART) Bukavu Democratic Republic of Congo Hopital Général de Référence de Panzi Bukavu Democratic Republic of Congo Laboratoire des hépatites virales Institut Pasteur de Bangui Bangui Central African Republic Department of Medicine and Center for Infectious Diseases Stellenbosch University Cape Town South Africa Faculté de Médecine Université Catholique de Bukavu (UCB) Bukavu Democratic Republic of Congo Department of Epidemiology Infectious Diseases and Microbiology University of Pittsburgh Pennsylvania USA Department of Epidemiology and International Health Johns Hopkins Bloomberg School of Public Health Baltimore MD USA

Short Retraction Notice? The paper does not meet the standards of "World Journal of AIDS". This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.? Editor guiding this retraction: Prof. Linda D. Moneyham (EiC of WJA) Please see the article page for more details.? The?full retraction notice in PDF is preceding the original paper which is marked "RETRACTED".

关键词： Democratic Republic of Congo Hepatitis B Virus Infection HIV-HBV Co-Infection Prevalence

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Contribution of Automated Antigen Tests, the LumiraDx Ag Test in the Response during the Second Wave of the COVID-19 Pandemic in Bangui

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Journal of Tuberculosis Research 2023年第4期11卷 173-183页

作者： Clotaire Donatien Rafaï Pierre Somse Wilfrid Sylvain Nambei Ernest Lango-Yaya Marie-Roseline Darnycka Belizaire Ulrich Vickos narcisse patrice komas Oscar Senzongo Luc Salva Heredeibona Ulrich Jeffrey Kotemossoua Rabbi Mermoz Senekian Simon Pounguinza Jephté Estimé Kaleb Kandou Christian-Diamant Mossoro-Kpinde Laurent Bélec Jean De Dieu Longo Norbert Richard Ngbale Abdoulaye Sepou François-Xavier Mbopi-Keou Gérard Grésenguet Boniface Koffi National Laboratory of Clinical Biology and Public Health Bangui Central African Republic Faculty of Health Sciences University of Bangui Bangui Central African Republic Ministry of Health and Population Bangui Central African Republic World Health Organization Bangui Central African Republic Institut Pasteur de Bangui Bangui Central African Republic Virology Laboratory Georges Pompidou European Hospital Université Paris Cité Paris France Hôpital Communautaire of Bangui Bangui Central African Republic Faculty of Medicine and Biomedical Sciences University of Yaounde I Yaounde Cameroon

Context and objective: The COVID-19 pandemic has become a major public health problem and has mobilized many innovative means of diagnosis. The Central African Republic is not spared. The emergence of variants and their impact require health monitoring despite the obligation of vaccination. The purpose of this campaign was to determine the circulation of pending second-wave variants. Patients and Methods: A second mass screening campaign took place from 02 to 22 July 2021 in the main land and river entry points of Bangui (Exit North-PK12, Exit South-PK9, Port Beach) and at the LNBCSP. Antigenic and RT-PCR tests carried out on nasopharyngeal samples made it possible to select strains which were finally sequenced. Results: Of 2687 participants included in the study, 53 (1.97%) were positive for SARS-CoV-2. Thirteen (1.53%) were male and 40 (2.18%) female. The analyses carried out on the LumiraDx analyzer were positive for 109 samples against 53 on the RT-PCR. The prevalence was higher in the most tested age groups (30 to 50 years) with two clusters identified. B.1.617.2 (Delta) variants were predominant (57%). Conclusion: SARS-CoV-2 continues to circulate. The acquisition of automated antigenic tests (LumiraDx®) with sensitivity and specificity close to those of the reference test (RT-PCR) will allow better mass diagnosis for an optimization of the surveillance of COVID-19 in our countries with limited resources. The predominance of the B.1.617.2 (Delta) variant would suggest a third wave in the Central African Republic.

关键词： COVID-19 Automated Antigen Testing

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Optimising Energy Consumption in SD-DCN Networks (Software Defined-Data Center Network)

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Open Journal of Applied Sciences 2024年第8期14卷 2223-2235页

作者： narcisse Tahi Etienne Soro Pacôme Brou Olivier Asseu UMRI STI INPHB INPHouphout Boigny Yamoussoukro Cte dIvoire Ecole Suprieure Africaine des Technologies de lInformation et de la Communication (ESATIC) LASTIC Laboratory of ESATIC Abidjan Cte dIvoire

Over the last decade, the rapid growth in traffic and the number of network devices has implicitly led to an increase in network energy consumption. In this context, a new paradigm has emerged, Software-Defined Networking (SDN), which is an emerging technique that separates the control plane and the data plane of the deployed network, enabling centralized control of the network, while offering flexibility in data center network management. Some research work is moving in the direction of optimizing the energy consumption of SD-DCN, but still does not guarantee good performance and quality of service for SDN networks. To solve this problem, we propose a new mathematical model based on the principle of combinatorial optimization to dynamically solve the problem of activating and deactivating switches and unused links that consume energy in SDN networks while guaranteeing quality of service (QoS) and ensuring load balancing in the network.

关键词： DCN Optimisation Energy Consumption QoS SDN

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Identification of the Diffusion Coefficients of Pollutants ( N O 3 - and Mn2+) through the Walls of Concrete Tank and Vulnerability of the Stored Water Quality

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Engineering（科研） 2024年第9期16卷 246-274页

作者： narcisse Malanda Bienvenu Ebata Ndion Christian Tathy Thibault Mongo Paul Louzolokimbembe Nation School Superior Polytechnic Marien Ngouabi University Brazzaville Republic of Congo Superior Institute Architecture Town Planning Building and Public Works University of Dnis Sassou Nguesso Kintl Republic of Congo

The populations of urban centers in Congo-Brazzaville have decided to develop various methods of water storage (concrete or masonry underground tanks) for domestic use, due to shortages in the distribution of water through the public network. However, questions remain as to the physico-chemical quality of the water stored in these tanks, when these structures are built in wet and relatively polluted areas. This paper presents a model of pollutant diffusion through the cementitious matrix (concrete) of tank walls simulated at a buried reservoir. The results of the experimental and numerical simulations show that certain concrete parameters, such as porosity, permeability and diffusivity, have a significant influence on the transfer of pollutants through the concrete walls, thus altering the physico-chemical quality of the stored water. The numerical models (1D) used to predict pollutant transfer and the quality of the stored water are consistent with those of the optimal control for identifying the diffusion coefficient. Major ion concentrations appear to be correlated with system porosity and diffusion coefficient. Nevertheless, the identification of the diffusion coefficient from the optimal control method, based on an explicit numerical resolution of a finite volume PDE for the approximation of the experiment, is not consistent with that of the optimal control method.

关键词： Buried Tank Water Concrete Modelling Optimal Control Diffusion Coefficient

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A Rare Etiology of a Life-Threatening Subdural Hematoma: Case Report and Literature Review

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Open Journal of Modern Neurosurgery 2024年第2期14卷 108-113页

作者： Ibrahim Dao Hassan Baallal narcisse Mike Wendpuiré Ouédraogo Ousmane Ouattara Department of Neurosurgery University Hospital Souro Sanou Nazi Boni University Bobo Dioulasso Burkina Faso Higher Institute of Health Sciences Nazi Boni University Bobo Dioulasso Burkina Faso Department of Neurosurgery Avicenne Military Teaching Hospital University Caddi Ayyad Marrakech Morocco

Background: Life-threatening subdural hematoma is commonly related to trauma and rarely revealed by neoplasm. Observation: We report a case of a 53-year-old suffering from mild headache and without a history of trauma, was admitted unconscious due to a subdural hematoma on radiological investigations. Beside the left subdural hematoma, there was also alytic lesion of the sphenoid wing and the temporal bone on the same side. An emergent removal of the subdural hematoma and an excision of the bone lesion were performed. Pathological examination diagnosed a cavernous hemangioma of the skull. The postoperative period was uneventful with a dramatic recovery of the patient. Conclusion: A quick worsening of a chronic headache, acute impairment of an uncommon headache deserve prompt investigation and emergent surgical management in case of intracranial hematoma. Any bone and dural abnormalities at the vicinity of a subdural hematoma require total excision with clean border and pathological examination.

关键词： Cavernous Hemangioma Subdural Hematoma Emergency Skull Surgery

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Comparative Analysis of Statistical Thickness Models for the Determination of the External Specific Surface and the Surface of the Micropores of Materials: The Case of a Clay Concrete Stabilized Using Sugar Cane Molasses

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Geomaterials 2024年第2期14卷 13-28页

作者： Nice Mfoutou Ngouallat narcisse Malanda Christ Ariel Ceti Malanda Kris Berjovie Maniongui Erman Eloge Nzaba Madila Paul Louzolo-Kimbembe Mechanics Energy and Engineering Laboratory Higher National Polytechnic School Marien Ngouabi University Brazzaville Republic of the Congo National Institute for Research in Engineering Sciences Innovation and Technology (INRSIIT) Brazzaville Republic of the Congo Higher Institute of Architecture Building Planning and Public Works Denis SASSOU N&#8217GUESSO University Kint&#233l&#233 Republic of the Congo Hydrogen Research Institute University of Quebec in Trois Rivieres Quebec Canada Superior Normal School (ENS) Marien Ngouabi University Brazzaville Republic of the Congo

In this work, four empirical models of statistical thickness, namely the models of Harkins and Jura, Hasley, Carbon Black and Jaroniec, were compared in order to determine the textural properties (external surface and surface of micropores) of a clay concrete without molasses and clay concretes stabilized with 8%, 12% and 16% molasses. The results obtained show that Hasley’s model can be used to obtain the external surfaces. However, it does not allow the surface of the micropores to be obtained, and is not suitable for the case of simple clay concrete (without molasses) and for clay concretes stabilized with molasses. The Carbon Black, Jaroniec and Harkins and Jura models can be used for clay concrete and stabilized clay concrete. However, the Carbon Black model is the most relevant for clay concrete and the Harkins and Jura model is for molasses-stabilized clay concrete. These last two models augur well for future research.

关键词： Statistical Thickness Model External Specific Surface Microporous Surface Clay Concrete Molasses

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Socioenvironmental Drivers of Farmers’ Perceptions of Climate Change Risk in Agroforestry Parklands of West Atacora in Benin (West Africa)

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Open Journal of Ecology 2024年第1期14卷 54-65页

作者： Amos Baninwain Nambima Thierry Dèhouégnon Houehanou narcisse Yehouenou Dowo Michée Adjacou Abdul Sodick Alassiri Gérard Gouwakinnou Laboratory of Ecology Botany and Plant Biology (LEB) Faculty of Agronomy (FA) University of Parakou (UP) Parakou Republic of Benin

Throughout the world, climate change is threatening the human population. In West Africa, smallholder farmers in indigenous agricultural societies typically hold considerable knowledge. Therefore, this study was conducted in West Atacora of Benin Republic to assess the drivers of farmers’ perceptions of climate change risk. We used a random sampling technique to select 360 households’ heads who were interviewed regarding different climate change risks perception. Binomial logistic regression was used to assess the drivers of farmers’ perceptions of climate change risks. The results showed that the farmers in drier areas had a higher perception of the global risk of climate change than those in humid areas. The same trend was observed for the seven different individual’s climate change risk investigated. The study identified also membership of farm organizations as main sociodemographic characteristic that explains farmers’ perception of climate change risk perception. These findings are helpful tools to sensitize the local people on climate change risk and cope with the risk in agricultural lands.

关键词： Climate Change Risk Local Ecological Knowledge Socio-Demographic Characteristics Benin West Africa

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C1C2 Wiring and Posttraumatic Atlantoaxial Dislocation: An Effective and Cheap Surgical Procedure in a Developing Country

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Surgical Science 2024年第5期15卷 357-370页

作者： Ibrahim Dao Massimiliano Visocchi Salah Sow John Jabang Ousmane Ouattara Astride Somda Abdoulaye Sanou Elie Dibloni Nassoum Arsène Tossou narcisse Ouedraogo Frédéric Bako Massadiami Soulama Malick Diallo Patrick Wendpouiré Hamed Dakouré Department of Neurosurgery University Hospital Souro Sanou Nazi Boni University Bobo Dioulasso Burkina Faso High Institute of Health Sciences Nazi Boni University Bobo Dioulasso Burkina Faso Military Hospital Colonel Major Tanguet Ouattara Bobo Dioulasso Burkina Faso Institute of Neurosurgery Craniovertebral Junction Surgery Unit School of Medicine Catholic University Rome Italy Department of Radiology and Medical Imaging University Hospital Yalgado Ouedraogo Joseph Ki-Zerbo University Ouagadougou Burkina Faso Department of Neurosurgery (Unit) Edward Francis Small Teaching Hospital Banjul Gambia Department of Neurosurgery University Hospital Yalgado Ouedraogo Joseph Ki-Zerbo University Ouagadougou Burkina Faso Department of Neurosurgery Military Hospital Capitaine Halassane Coulibaly Ouagadougou Burkina Faso Department of Orthopedic Surgery University Hospital Souro Sanou Nazi Boni University Bobo Dioulasso Burkina Faso

Objectives: Atlantoaxial dislocation remains a rare and serious condition with a high preoperative and postoperative morbidity and mortality. Its successful surgical management is still challenging and gratifying for neurosurgeons. Several technics have been described such as wiring, trans articular screwing, C1C2 screwing with plate and screw introduced by Goel et al., and modified by insertion of polyaxially screw and rod many years later by Harms. Unavailability and expensiveness of upper cervical spine instrumentation device led us to C1C2 Wiring resulting in a good outcome. Finally, a quadriplegic patient with a more comfortable financial condition had ordered devices from abroad and benefit for Goel and Harms screwing technique and improved dramatically from ASIA A to ASIA E. Material and methods: This is a retrospective study of patients managed in our department by a same neurosurgeon from January 2019 to April 2024. Results: We defined 6 men and 1 woman with an average age of 33 years. Unrestrained driver in a rollover motor vehicle accident was most common. Only one patient was neurologically intact on admission. Neurovegetative disorders were noticed in one patient. Dislocation was associated to a fracture of the dens in two patients. Three patients have been successfully operated with remarkable outcome, mostly from ASIA A to E. Conclusion: C1C2 dislocation is a serious condition and C1C2 Wiring represents an effective and cheaper technic. Therefore, this technic should deserve consideration above all in low incomes countries when screwing devices are not available. Seatbelt should be demanded for motor vehicle drivers and passengers.

关键词： Superior Cervical Spine Dislocation Fracture Wiring Screwing Neurovegetative Disorders

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Relationship Between the Spatiotemporal Distribution of Dominant Small Pelagic Fishes and Environmental Factors in Mauritanian Waters

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Journal of Ocean University of China 2020年第2期19卷 393-408页

作者： EBANGO NGANDO narcisse SONG Liming CUI Hongxing XU Shuangquan College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China Collaboration Innovation Center for National Distant-Water Fisheries Shanghai 201306China

The relationship between the spatiotemporal distribution of three dominant small pelagic fishes,including chub mackerel(Scomber japonicus),horse mackerel(Trachurus trecae)and round sardinella(Sardinella aurita),and the environmental factors in Mauritanian waters were analyzed by using 4 years of logbook data of commercial purse seine fisheries to improve the efficiency of fishery and management of sustainable exploitation.A Tweedie-generalized additive model(GAM)of 8-day average catches and the monthly geostatistical analysis of daily catches were used in this study to analyze the influence of environmental factors on catch per unit of effort(CPUEs)and to map the spatial distribution of three mixed dominant small pelagic fishes,respectively.A 10'×10' grid was used,and environmental factors were processed from remote sensing,including 8-day average sea surface temperature(SST),the nearest distance between SST fronts and CPUE position(Df),chlorophyll-a(Chl-a)concentration,salinity,and eddy kinetic *** showed that 1)the distribution of three dominant small pelagic fishes might be related to the intensity of upwelling in Mauritanian waters;2)oceanic fronts might play a key role in the ecology of chub mackerel,horse mackerel,and round sardinella;3)Chl-a concentration might be associated with the feeding grounds of chub mackerel;4)the target species distribution appeared sensitive to gradient changes in the amount of salinity;5)three zones(northern,central,and southern)with variable abundances were delineated;and 6)a high concentration of the center of gravity in the central zone might be related to the strong upwelling of nutrient-rich *** study can provide new insights to enhance the fishery efficiency and sustainable exploitation management of purse seiners in certain area off Mauritania.

关键词： aggregation environmental factors small pelagic fish light purse seiner Mauritanian waters

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