Central African Sub-region Research Articles

First assessment of the biodiversity of praying mantises (Insecta: Mantodea) in Cameroon with DNA barcoding.

Praying mantises are the apex insect predators in many ecosystems, nevertheless they receive relatively less recognition in biodiversity reviews. We report a first survey of diversity of praying mantises in Cameroon, which is situated in the Congo Basin region, one of the richest biodiversity hotspots. Combination of light trapping with manual collecting resulted in 495 specimens representing 62 species. A total of eight species are novel for the country, at least five species are likely undescribed. DNA barcodes of 72 specimens representing every collected species were obtained, curated, and submitted to NCBI database. For eight species, barcodes are published for the first time. A maximum likelihood phylogenetic tree was created using all available barcodes of Mantodea of Central African subregion. The results obtained during this study stress the importance of combining traditional and molecular approaches during biodiversity assessments of often neglected taxa, the latter aiding in uncovering new species, resolving unknown morphological divergencies and assigning conspecifics.

Understanding the crustal architecture beneath the Bangui magnetic anomaly and its interactions with central African tectonic megastructures based gravity and magnetic analysis

The Bangui magnetic anomaly (BMA) in Central Africa is one of the largest continental magnetic anomalies on Earth in terms of amplitude and lateral size. Determining the sources of the BMA can lead to an increased understanding of the crustal dynamic in the Central African sub-region and the African continent as a whole. Magnetic and gravity analysis-based derivative, two-dimensional forward modelling and a Curie isothermal depth, showed that (a) the bottoms of the magnetic sources were between 15 and 35 km; (b) the BMA is a coalescence of several anomalies that trend E-W and roughly NE-SW. These directions coincide with regional Pan African-aged shear zones along the Central African orogenic belt and to thrust sheets at the northern edge of the Congo Craton. The depth of magnetization does not exceed 35 km with the amplitude of magnetization becoming smaller in the Central African Republic. The potential magnetic susceptibility sources have an average density of 2850 kg/m3 and magnetic susceptibilities between 0.06 and 0.25 SI. The BMA is interpreted to be a combination of middle and lower crustal bodies that are not continuous and consist of magnetic mineral rich granulites and banded iron formations. The gravity and magnetic modelling indicate that the entire crust was involved in the Pan African collisional event similar to what is seen in the Mozambique belt in East Africa. Combined with geological and geochemical studies, the models add evidence that one or two subduction zones were involved in accreting terranes on the northern edge of the Congo Craton. The tectonic accretions caused a crustal remobilization along major shear zones that has locally contributed to a probable circulation of fluids enriched in ferromagnesian minerals during late Neoproterozoic magmatism that created the BMA sources.

Evaluation of the Fertilizing Power of Sludge from Physicochemical Water Purification Stations: Case of the Yato Station, Littoral-Cameroon

The Yato physicochemical water purification station is located in the commune of Dibombari in the Littoral-Cameroon region. It is one of the largest drinking water production stations in the Central African sub-region. This work aims to evaluate the agronomic power of the sludge from this drinking water production station. To achieve this objective, mixed samples of sludge from sludge treatment basins (taken according to the technique described in GIDS-A003 point 6 as explained in the Solid and pasty waste sampling strategy of the Code of Good Practice No. 2). and primary settling basins (collected in transparent 1.5L polyethylene terephthalate bottles) were analyzed. Likewise, three soil samples (marsh, Point 1 and Point 2) were taken and then sent to the laboratory where physicochemical analyzes were carried out. The characteristics of the samples that were analyzed are: particle size, texture (sand, silt, clay) and physicochemistry (organic matter, CEC, sum of exchangeable bases, calcium, nitrogen, potassium and magnesium). The results obtained show that the soils exposed to contamination from the sludge of the station have better agronomic properties both on a physical level with a stable structure favorable to plant growth and good aeration unlike the soils far from the station which presented a high risk. degradation; that on the chemical level with an optimal cationic balance, a high reserve of exchangeable bases, a strong CEC but average limitations in assimilable phosphorus and pH unlike the soil far from the station which presented an insufficiency of potassium which did not facilitate a balance cationic, a low CEC but a pH above 5.5 which is the value recommended in agronomy. Biochemically, organic matter is above 2% in all soils, a mineralization rate less than 20 favoring the rapid mineralization of carbon and a release of nitrogen available to the plant. These results obtained allow us to conclude that the sludge from the Yato station can be used in agronomy as an organic fertilizer in order to correct the soil structure, the CEC, the cationic balances and also provide the soil with a good base reserve. However, treating this sludge with lime could regulate the pH of the soil and reduce the mobility of heavy metals in the soil.

Assessment of the Polluting Status of Sludge from a Physicochemical Water Purification Unit and Their Impacts on the Soil: Case of the Yato Station (Littoral-Cameroon)

The Yato physicochemical water purification station is located in Dibombari District Council in the Littoral-Cameroon region. It is one of the largest drinking water production stations in the Central African sub-region. This work aims to evaluate, through the quantification of the concentrations of Trace Metal Elements (TMEs), the polluting status of the sludge from this drinking water production station and their impacts on the soil. To achieve this objective, mixed samples of sludge from sludge treatment ponds (taken according to the technique described in GIDS-A003 point 6 as explained in the Solid and pasty waste sampling strategy of Code of Good Practice No. 2) and samples of sludge from primary settling basins (taken in transparent bottles in polyethylene terephthalate of 1.5L) were analysed. Likewise, three soil wells were carried out and soil samples were taken on two levels of alteration then sent to the laboratory where physicochemical and TME analyses were carried out. The characteristics of the samples that were analysed are: particle size, texture (sand, silt, clay), physiochemistry (pH, electrical conductivity, temperature, phosphorus, nitrogen) and TME (chromium, copper, zinc, manganese). The results obtained show that the polluting status of the sludge from the Yato station is proven because their pollution index by heavy metals is greater than 1. The pollution index greater than 1 in the sludge from the treatment basins is due to the strong concentrations of TME originating from the accumulation of waste of all kinds in this location. Overall, TME concentrations in soils decrease for the most part from the surface towards depth. All the TMEs studied (Zn, Mn, Cu, Cr) are present in all horizons. There is multiple contamination of sludge by TMEs because their pollution index is greater than 1 (IP>1). Although the sludge pollution indices are greater than 1, those of the different horizons are much lower than 1. Thus, since the TMEs decrease with depth, the subsurface horizons would be less affected by the pollutants contained in the station sludge. marking a real pollution of the surface layers.

Role of Governance in Implementing Climate Change Adaptation Strategies in the Congo Basin Case of Cameroon and the Democratic Republic of Congo

The low adaptability capacity of the Central African sub-region to climate change has made it one of Africans’ most vulnerable sub-regions in the continent as this sub-region depends heavily on resources sensitive to climate change. Cameroon and the Democratic Republic Congo are host to the world's second largest rainforest after the Amazon. This implies that climate change will undermine development in this sub-region and the rest of the continent as the effects of climate change are faced more by the most vulnerable. There is however rising interest in SSA to mitigate and adapt climate change solutions. While such efforts exist, knowledge on the governance arrangements exist in very fragmented forms. Specifically, knowledge on how global climate changes processes is reflected in national policies remain relatively less studied. So too are their limited evidence on how national policies play out at local level. Such knowledge deficits stall scientific evidence building and policy orientation to strengthen climate adaptation practices in countries of SSA, with Cameroon and DRC being classical examples. Yet theory building on climate change governance requires such context specific evidence. In addition, for a comprehensive policy to be adopted and made effective, climate change actions require such scientific evidence. This therefore validates the need to analyze how such global processes are framed into national policy and policy instruments for climate mitigation and adaptation, and to establish the connections and disconnections between what is framed at national level and what applies at local level in terms of climate change policy instrument and what explains such variations. Though effective climate action requires political commitment, well-aligned multi-level governance and institutional frameworks, laws, policies and strategies, as outlined by the Intergovernmental Panel on Climate Change (IPCC), there is still need for clear goals, adequate finance and financing tools, coordination across multiple policy domains, and inclusive governance processes in Cameroon and the Democratic Republic of Congo to harness these goals. This study investigated the role of governance in implementing climate change adaptation in Cameroon and the DRC. This research therefore aimed at examining the role of governance in implementing climate change adaptation strategies in Cameroon and the DRC. The study made use of primary and secondary data which was analyzed using content analysis to triangulate the relationship that exist between governance and the implementation of climate change adaptation strategies in Cameroon and the DRC. Results highlight the dominant role of governance in shaping adaptation efforts, challenges in implementation, spatial disparities, and the influence of national policies and stakeholder engagement. Policy recommendations emphasize the need for improving governance structures, enhancing stakeholder participation, mainstreaming gender considerations, and addressing financial constraints to build resilience and effectively respond to climate change impacts in both countries. The findings underscore the importance of context-specific strategies that prioritize inclusivity, transparency, and collaboration to address the complex challenges posed by climate change.

Commemorating national cultures at Cameroon’s Museum of Civilizations

Of the 20 private museums recognized by the Cameroon government, the Museum of Civilizations, Dschang (Musee des Civilizations, MDC) stands out as a hub of national cultures, despite its poor visitation and low visibility. Conceived in 1996 and inaugurated in November 2010, MDC was located at the heart of Dschang town in the West Region of Cameroon (Central Africa). Its central theme is man at the heart of his cultural identity for a dialogue of civilizations. Today, MDC faces fierce challenges as it memorializes the cultures of the Fang-Beti-Bulu, Sudano-Sahelian, Grassfields and Sawa peoples of Cameroon. This paper revisits MDC among other things, as a melting pot of Cameroonian cultures and regional identities. Our central question is: “how, despite its multiple challenges, does MDC successfully memorialize Cameroon’s four principal cultural areas?” While cultural representations remain central, concerns of identity, research and the teaching of museology have also been highlighted. A blend of qualitative research, iconography and ethnography, analyzed on the basis of content, chronology and participatory observation, provide the methodological grounds for our findings. The Museum of Civilizations not only commemorates the cultures and civilizations of Cameroon and the Central African sub-region in general, but also provides an ideal hub for culture tourism, education and research.

Mosquito-Borne Arboviruses Occurrence and Distribution in the Last Three Decades in Central Africa: A Systematic Literature Review.

Arboviruses represent a real public health problem globally and in the Central African subregion in particular, which represents a high-risk zone for the emergence and re-emergence of arbovirus outbreaks. Furthermore, an updated review on the current arbovirus burden and associated mosquito vectors is lacking for this region. To contribute to filling this knowledge gap, the current study was designed with the following objectives: (i) to systematically review data on the occurrence and distribution of arboviruses and mosquito fauna; and (ii) to identify potential spillover mosquito species in the Central African region in the last 30 years. A web search enabled the documentation of 2454 articles from different online databases. The preferred reporting items for systematic reviews and meta-analyses (PRISMA) and the quality of reporting of meta-analyses (QUORUM) steps for a systematic review enabled the selection of 164 articles that fulfilled our selection criteria. Of the six arboviruses (dengue virus (DENV), chikungunya virus (CHIKV), yellow fever virus (YFV), Zika virus (ZIKV), Rift Valley fever virus (RVFV), and West Nile virus (WNV)) of public health concern studied, the most frequently reported were chikungunya and dengue. The entomological records showed >248 species of mosquitoes regrouped under 15 genera, with Anopheles (n = 100 species), Culex (n = 56 species), and Aedes (n = 52 species) having high species diversity. Three genera were rarely represented, with only one species included, namely, Orthopodomyia, Lutzia, and Verrallina, but individuals of the genera Toxorhinchites and Finlayas were not identified at the species level. We found that two Aedes species (Ae. aegypti and Ae. albopictus) colonised the same microhabitat and were involved in major epidemics of the six medically important arboviruses, and other less-frequently identified mosquito genera consisted of competent species and were associated with outbreaks of medical and zoonotic arboviruses. The present study reveals a high species richness of competent mosquito vectors that could lead to the spillover of medically important arboviruses in the region. Although epidemiological studies were found, they were not regularly documented, and this also applies to vector competence and transmission studies. Future studies will consider unpublished information in dissertations and technical reports from different countries to allow their information to be more consistent. A regional project, entitled "Ecology of Arboviruses" (EcoVir), is underway in three countries (Gabon, Benin, and Cote d'Ivoire) to generate a more comprehensive epidemiological and entomological data on this topic.

Performance evaluation of different building envelopes integrated with phase change materials in tropical climates

The need to improve building envelope components and reduce energy consumption is becoming increasingly crucial. The use of phase-change material (PCM) technologies is a viable solution to reduce energy consumption in buildings and associated greenhouse gas emissions. However, the performance of PCMs in buildings is strongly dependent on the melting temperatures and the climate conditions of the building's location. Therefore, the present study presents an optimisation-based approach to assessing the performance of building walls integrated with PCMs at different melting temperatures. To achieve this goal, a multiobjective genetic algorithm is used in conjunction with EnergyPlus building energy models to determine the optimal balance between total building energy consumption, lifecycle cost, and CO2 emissions. The proposed approach is applied to a single-family residential building located in six locations in the Central African sub-region classified as tropical savanna climate (Aw), hot semi-arid climate (Bsh), tropical rainforest climate (Af), and tropical monsoon climate (Am). Two different PCM technologies (InfiniteRPCM and BiocPCM) are applied to four wall types (brick, concrete block, cast concrete, and earth), and their parametric models are developed in EnergyPlus to optimise the melting temperature, thickness, and location of each PCM layer simultaneously. An optimisation is conducted for each selected wall and each location, and the optimised buildings are systematically compared to the reference buildings. The optimisation results showed that regardless of the climate zone and wall type, the application of PCMs with different melting temperatures significantly reduced energy consumption and CO2 emissions. Moreover, the results showed a different set of optimal solutions for each climate zone and wall type. The optimal solutions reduced the total energy, life cycle cost, and CO2 emissions by up to 47.80 %, 29.62 %, and 52.96 %, respectively.

A 43-year of human thermal comfort in Central Africa.

In this study, the human thermal stress was quantified across Central Africa (C.A.) using the Universal Thermal Climate Index (UTCI). Although many of the documented studies on the use of UTCI in relation to human health are currently restricted to countries in the northern hemisphere, this contribution constitutes a prerequisite of information for future research in the region. To mitigate the problem of lack of field data in the Central African sub-region, we downloaded UTCI data via the ERA5 reanalysis portal. Based on this data source, we have explored the spatiotemporal characteristics and the resulting behaviour at annual, seasonal and monthly scales in Central Africa over the period 1982 to 2022. On these different scales, 4 of the 10 UTCI thermal stress categories were experienced, ranging from mild cold stress to strong heat stress. Spatially, cases of moderate heat stress were the most widespread, with cases of strong intensity occurring in a few isolated areas in the centre, east and west. Slight cold stress is confined to the south-east domain, particularly in autumn and winter. From 1982 to 2022, heat stress has increased significantly in the region, with peaks observed in January and October; very few areas have been spared the phenomenon of thermal stress. However, a slight decreasing trend was noticed along coastal regions and the south of C.A. Thereafter, the trend values showed the degree of C.A. vulnerability to global warming, and thus appropriate measures should be taken in relation to outdoor occupations and its impacts on the population of this region.

Case Volumes, Variations, and Challenges for General Surgery Training in the East, Central, and Southern African Sub-Region: Heterogeneity and Challenges as COSECSA Concludes Its First Twenty-Four Years.

Case Volumes, Variations, and Challenges for General Surgery Training in the East, Central, and Southern African Sub-Region: Heterogeneity and Challenges as COSECSA Concludes Its First Twenty-Four Years.

Successful surgical closure and continence rate of obstetric fistula in Africa: systematic review and meta-analysis.

A female genital fistula is an abnormal connection between a woman's reproductive tract and her urinary tract or rectum. While numerous studies have aimed to determine the success rate of obstetric fistula closure in different health settings, there remains a significant scarcity of data on closure success rates and incontinence rates for various types of fistulas at the regional and sub-regional levels. The success rate reflects the continent's healthcare setup in regard to the World Health Organization standards. Thus, this study aims to determine the success of surgical closure and the continence rate of obstetric fistula in Africa. This systematic review and meta-analysis review includes studies conducted up to February 2023. Search engines like EMBBASE, Medline, Google, PubMed, Google Scholar, African Journals Online, and ScienceDirect databases were utilized to find articles. The Joanna Briggs Institute critical evaluation checklist was used to evaluate the quality of our review, which was conducted in accordance with PRISMA criteria. Heterogeneity was indicated by a p-value for I2 statistics of less than 0.05. Publication bias was assessed using the Egger regression asymmetry test. Data were entered into Microsoft Excel and analyzed using STATA 16. This review includes 85 studies. A total of 24 countries from East, West, Central, North, and Southern African sub-regions were included. The overall pooled estimated rate of successful obstetric fistula closure is 86.15 (95% CI: 83.88-88.42). Moreover, the pooled estimated rate of successfully closed vesico-vaginal fistulas but with ongoing or residual incontinence (wet) was revealed as 13.41% (95% CI: 11.15-15.68). The pooled estimated rate of successfully closed rectovaginal fistulas and combined VVF and RVF are 91.06% (95% CI: 86.08-96.03) and 62.21% (95% CI: 48.94-75.49), respectively. The rate of successful obstetric fistula closure in Africa is 86.15, which is higher than the WHO target. However, the surgical closure rate of a combined VVF and RVF is 62.2%, which is significantly lower than the WHO target.

ANALYTICAL REVIEW ON FOOD BORN INFECTIOUS DISEASES: STATEMENT AND SURVEILLANCE SYSTEMS IN CENTRAL AFRICA

Foodborneinfectiousdiseases are of greatconcern in Central Africa and pose a significantthreat to public health. The main objective of thisstudyis to present the inventory of the sub-regionalfoodsituationspecifically, to highlight the foodorigin of infectiousdiseases and existing surveillance actions. It isbased on documentation focused on the relevance of articles and official databases. About a hundredscientific articles published in indexedjournals and/or with an international impact factor wereused. The results show thatfoodborneinfectiousdiseases are mainlycaused by parasites such as Salmonella sp., Campylobacter sp., Vibrio cholerae, Vibrio non-cholerae and Shigella, etc. dietary habits, poorhygiene practices duringprocessing, cross-border foodtrade conditions and climatic variations are the main factorsthatincrease the risk of thesediseases. Morethan 70% of foodsold in public places in the Central Africansub-region via the informalsectoriscontaminatedmainly by Bacillus cereus, Salmonella, Shigella, Escherichia coli and even Vibrio cholerae. Another important source of food contamination remainsanimals (conventionallyfarmed or wild). Indeed, the risk of infection for humans via foodzoonoticsremains a constant reality in Central Africa. Unfortunately, the surveillance systems are less efficient. Mandatoryreporting and the strengthening of National Reference Centers and Laboratories can help member countries in Central Africathrough joint action groups to betterdevelop a surveillance and response plan.

Military expenditures and human capital development in sub-Saharan Africa: a system GMM approach

ABSTRACT This study investigates the military outlays effects on human capital development in sub-Saharan Africa. By using panel data covering 44 countries from 1995 to 2020, a system Generalized Method of Moments is adopted as the estimation technique of a dynamic panel model. Findings show that military outlays have a significant positive effect on education spending in sub-Saharan Africa. However, the sensitivity analysis reports a mitigated result, highlighting the diversity of evidence on the ‘guns better than butter’ literature. While military outlays positively affect education expenditures in central and southern African sub-regions, they crowd-out the public spending allocated to education development in Sahel & Lake Chad area, western and eastern sub-regions. These results, therefore, suggest that policy makers should promote the approach which considers defense as a component of socioeconomic development by regulating the perfect ratio of military spending that meets their needs.

Social Media and Electoral Law Violation in Cameroon: The Case of the 2018 Presidential Election

Most presidential elections in Africa, especially in the central African sub-region have always ended up in some form of violence. Ever since the social media became a key tool in elections including those organize in African countries, it has been used as a platform to either decrease or escalate election violence, given its characteristics. The social media is not regulated, the law governing its use is difficult to enforce, everybody can create contents, it has a wider reach and it can be used to spread information instantly. The 2018 presidential election in Cameroon was marked by violence. The violence was blamed partly on the way the social media was used by different actors during the 2018 presidential election. This paper examines how the social media was used by actors of the election to violate the electoral code. The theoretical assumptions of this research are based on agenda setting which deals with the prioritization of stories or issues, their treatment and their place in the media. The paper used a quantitative research approach. A total of 176 questionnaires were distributed to voters. They were based in Douala and Buea. Key the findings reveal that social media was used to violate the electoral code during the 2018 election as 103 (58.5%) respondents received or read campaign messages before the official campaign. The findings equally reveal that the social media was used to spread fake news, and misinformation which played a role to incite and facilitate violence. The implication of this finding is that it will get election stakeholders to understand the dangers of the social media especially during elections and see what needs to be done to make the social media a better tool for election management.

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

Wood plays a major role in the production of furniture and wooden structures. Nevertheless, in this process, the massive use of adhesives and plural connectors remains a definite problem for health and the environment. Therefore, wood welding is a breakthrough in this respect. This paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against water. Our contribution also highlights the need to join African tropical woods using the rotational friction welding technique. According to our results, these woods present interesting chemical singularities, which could provide solutions to the water vulnerability of the welded wood. Moreover, the use of such a joining method would first free the Cameroonian furniture industry from the chemical industry, secondly position it at the forefront of new eco-design trends and thirdly make it competitive with other countries in the Central African sub-region. These works enrich the long and rich bibliography on the technique of wood welding, which has long been conspicuous by its absence of tropical woods.

Assessment of Vulnerability to the Covid-19 Pandemic in the Central African Sub-region.

This study was aimed at examining the vulnerability of Central Africa to the COVID-19 pandemic. Demographic, health, and socio-economic indicators were used to describe the vulnerability. The study period was from December 31st, 2019 to May 31st, 2020 (i.e. 5 months after the start of the pandemic). According to demographic indicators, African populations appear younger than in Europe, Asia, and North America, where evidence showed a higher lethality of COVID-19 and a higher frequency of hospitalization among the elderly. This highlights the protective effect of the age structure of Central African populations. Their populations face significant vulnerability from high morbidity and a considerable deficit in health care facilities and services. Poverty indicators are not in their favour for a sustainable implementation of effective pandemic control measures. Very low literacy rates in some countries, misinformation, and belief in conspiracy theories could affect the community involvement in the response. Several countries are weakened by other humanitarian crises, including conflicts and other epidemics. The early easing of lockdown restrictions in certain countries could worsen the situation. In this sub-region, where the largest proportion of the population lives in poverty, poor sanitary conditions, conflicts, and humanitarian crises, the question of standards of prevention could appear to be a luxurious idea relegated to the background. Central African countries need financial and logistical support for a sustainable and effective response. These observations could be easily extrapolated to other sub-Saharan sub-regions.

Performance of Abuja MOU on Port State Control in Enforcement of IMO Regulations on Maritime Safety

Abstract The study evaluates the performance of the Abuja Memorandum of Understanding (MoU) on port states control (PSC) with a view to providing empirical evidence and information on the rates of change in inspection efforts, detention efforts, and poor inspection performance of PSC Officers in the Abuja MoU. It examined the performance of the Abuja MoU and the level of compliance with International Maritime Organization (IMO) regulations in the West and Central African sub-region. Secondary data obtained from the database of the Abuja MoU administration was used. The findings indicate that the implementation of the instrument has improved maritime safety in the region. The result also shows that trends of inspection efforts, poor inspection performance, number of inspections with and without detected deficiencies grew in the monitored period. The detention rate declined, which implies a decline in the trend of deploying unseaworthy vessels in the waters of the region, which is good for maritime safety administration in the region. About 92.5 % of the total inspections are fully compliant with the IMO safety regulation while 7.44 % of the inspection efforts show shortcomings and failure to comply with IMO regulations in the region

Commissioning Experience of a Medical Linear Accelerator in a Low-Resource Setting in Sub-Saharan Africa

With increasing cancer incidence in Africa, a number of Sub-Saharan African countries have started implementing radiotherapy programs based on linear accelerator (linac) technology. This work summarizes the commissioning experience of a commercially available medical linac installed in a resource-limited oncology centre in Cameroon for the delivery of high-quality radiation treatments to cancer patients in central Africa. Cameroon is a central African country in Sub-Saharan Africa. Using a 2D water phantom and various ionization chambers, we measured commissioning data for a medical linac with 6X and 18X photon beams, and five electron energies ranging from 6–20 MeV. Relative measurements included percent depth doses (PDDs), beam profiles, scatter factors, wedge factors, and electron cone factors. Absolute calibrations of the beam energies were performed using the American Association of Physicist in Medicine Task Group Report 51. Accurate calibrations were checked by irradiating the mailed thermoluminescent dosimeters service offered by MD Anderson Cancer Center. Photon PDDs agreed within 1% of the average of several linacs of the same type at depths between 5 and 20 cm, which are consistent with the data used by the manufacturer for acceptance testing. For electrons, the agreement was within 2 mm for R₅₀, R₉₀, R_p, and d_max. Symmetry and flatness for all photon and electron beams were within 2% for various fields. All absolute calibrations met the MD Anderson Cancer Center criteria within 3%. This work presents the successful implementation and modernization of a radiotherapy program based on linac technology in the central African sub-region in Sub-Saharan Africa. As the first operational medical linac in the sub-region, the commissioning data can provide comparison data to other linacs in the future to ensure high-quality of machine commissioning for clinical use.

Explaining the Absence of a Regional Hegemon in the Central African Sub-region

The end of the Cold War saw a shift in power dynamics globally, changing the security dynamics of many regions globally including those in Africa. With the security void left by these great powers in Africa, regional hegemons have played significant roles in promoting regional peace and stability. Regional hegemons have greatly helped to sustain peace and stability in the Economic Community of West African States (ECOWAS) and Southern African Development Community (SADC), but this has not been the case in the Economic Community of Central African States (ECCAS). This paper seeks reasons why no hegemon (dominant state) exists in the ECCAS region. The study analyses the material resource capacities of regional members and argues that a multiplicity of regional groupings, internal political instability, economic challenges and the neo-colonial hand of France accounts for the absence of a hegemon in the region.

Prevalence and factors associated with anxiety and depression amongst hospitalised COVID-19 patients in Laquintinie Hospital Douala, Cameroon.

Studies assessing the mental health of patients with COVID-19 infection remain limited. Disasters and major emergencies, not just COVID-19, undoubtedly lead to greater incidence of mental health problems. Previous studies indicate that the novel Coronavirus disease can cause panic and stress in patients. Our literature search didn’t reveal any previous published data from Cameroon and the Central African sub-region. In order to bridge this gap, we assessed the prevalence and factors associated with depression and anxiety in COVID-19 patients. We carried out a cross-sectional study in a secondary hospital in the Littoral Region of Cameroon. We recruited hospitalised COVID-19 patients during a 4-month period. We collected data on sociodemographic characteristics. The HADS score was used to assess levels of anxiety and depression. All analysis were done using Stata 14. A P value of <0.05 was used as the cut-off for statistical significance. A total number of 285 patients took part in this study with a mean age of 48.47 years. The prevalence of anxiety in COVID-19 patients was 60.35% while the prevalence of depression was 81.40%. At multivariate logistic regression male gender (OR: 1.89, P = 0.04), hypoxaemia (OR: 2.20, P = 0.01), presence of COVID-19 complications (OR: 1.61, P = 0.02) and current episode of depression (OR: 4.14, P<0.01) were independently associated with anxiety. Similarly, age > 35 years (OR:2.03, P = 0.02), presence of comorbidity (OR: 1.68, P = 0.01), BMI > = 30kg/m2 (OR: 1.78, P = 0.02), presence of COVID-19 complications (OR: 1.28, P = 0.01) and anxiety (OR: 4.60, P<0.001) were independently associated with depression. Hospitalised patients with COVID-19 experienced high levels of anxiety and depression. Treatment of hospitalised patients with COVID-19 should therefore include psychotherapy and psychiatric support.