The reemergence of dengue virus in Sudan

Impact of deforestation and climate on spatio-temporal spread of dengue fever in Mexico

Dengue prevalence results from the interaction of multiple socio-environmental variables which influence its spread. This study investigates the impact of forest loss, precipitation, and temperature on dengue incidence in Mexico from 2010 to 2020 using a Bayesian hierarchical spatial model. Three temporal structures-AR1, RW1, and RW2-were compared, with RW2 showing superior performance. Findings indicate that a 1 % loss of municipal forest cover correlates with a 16.9 % increase in dengue risk. Temperature also significantly affects the vectors' ability to initiate and maintain outbreaks, highlighting the significant role of environmental factors. The research emphasizes the importance of multilevel modeling, finer temporal data resolution, and understanding deforestation causes to enhance the predictability and effectiveness of public health interventions. As dengue continues affecting global populations, particularly in tropical and subtropical regions, this study contributes insights, advocating for an integrated approach to health and environmental policy to mitigate the impact of vector-borne diseases.

Knowledge, attitude, and practice towards dengue fever among medical students in Sudan: A cross-sectional study

Background

Dengue fever, a neglected tropical disease, exhibits a total seroprevalence of 27% in Sudan. During the recent outbreak, medical students actively participated in health education and community outreach programs. This study aims to assess the knowledge, attitude, and practice (KAP) of medical students regarding Dengue Fever (DF) during its current outbreak in Sudan.

Design and methods

We conducted a cross-sectional study involving medical students from more than 15 Sudanese universities, encompassing 11 states. Data collection took place between October 23 and November 10, 2023, utilizing a Google Form questionnaire. A convenient sampling technique was employed to reach students due to its accessibility and feasibility during the ongoing conflict in Sudan. Correlation and regression analyses were used to identify predictors of KAP and establish associations between KAP domains and socio-demographic factors.

Results

Of 694 medical students, 11% reported a previous infection with DF. Among the participants, 58% demonstrated good knowledge, 74.1% exhibited a positive attitude, and less than half (46.7%) demonstrated good preventive practices. There was a positive correlation between knowledge and attitude levels with the practice level (p < 0.001). Gender, age, and previous DF infection emerged as significant predictors (p < 0.05) of the overall KAP level in multiple logistic regression.

Conclusions

Our study revealed a commendable level of knowledge and attitude but a suboptimal level of practice regarding DF among medical students. This inadequacy in practice, particularly among medical students who are expected to set an example, is concerning and warrants further investigation.

Developing recombinant antibodies by phage display technology to neutralize viral infectious diseases

The use of recombinant antibodies developed through phage display technology offers a promising approach for combating viral infectious diseases. By specifically targeting antigens on viral surfaces, these antibodies have the potential to reduce the severity of infections or even prevent them altogether. With the emergence of new and more virulent strains of viruses, it is crucial to develop innovative methods to counteract them. Phage display technology has proven successful in generating recombinant antibodies capable of targeting specific viral antigens, thereby providing a powerful tool to fight viral infections. In this mini-review article, we examine the development of these antibodies using phage display technology, and discuss the associated challenges and opportunities in developing novel treatments for viral infectious diseases. Furthermore, we provide an overview of phage display technology. As these methods continue to evolve and improve, novel and sophisticated tools based on phage display and peptide display systems are constantly emerging, offering exciting prospects for solving scientific, medical, and technological problems related to viral infectious diseases in the near future.

Population genetic structure of Aedes aegypti subspecies in selected geographical locations in Sudan

Although knowledge of the composition and genetic diversity of disease vectors is important for their management, this is limiting in many instances. In this study, the population structure and phylogenetic relationship of the two Aedes aegypti subspecies namely Aedes aegypti aegypti (Aaa) and Aedes aegypti formosus (Aaf) in eight geographical areas in Sudan were analyzed using seven microsatellite markers. Hardy-Weinberg Equilibrium (HWE) for the two subspecies revealed that Aaa deviated from HWE among the seven microsatellite loci, while Aaf exhibited departure in five loci and no departure in two loci (A10 and M201). The Factorial Correspondence Analysis (FCA) plots revealed that the Aaa populations from Port Sudan, Tokar, and Kassala clustered together (which is consistent with the unrooted phylogenetic tree), Aaf from Fasher and Nyala populations clustered together, and Gezira, Kadugli, and Junaynah populations also clustered together. The Bayesian cluster analysis structured the populations into two groups suggesting two genetically distinct groups (subspecies). Isolation by distance test revealed a moderate to strong significant correlation between geographical distance and genetic variations (p = 0.003, r = 0.391). The migration network created using divMigrate demonstrated that migration and gene exchange between subspecies populations appear to occur based on their geographical proximity. The genetic structure of the Ae. aegypti subspecies population and the gene flow among them, which may be interpreted as the mosquito vector's capacity for dispersal, were revealed in this study. These findings will help in the improvement of dengue epidemiology research including information on the identity of the target vector/subspecies and the arboviruses vector surveillance program.