Double-Stranded RNA Targeting Dicer-Like Genes Compromises the Pathogenicity of Plasmopara viticola on Grapevine.

Downy mildew caused by Plasmopara viticola is one of the most devastating diseases of grapevine, attacking all green parts of the plant. The damage is severe when the infection at flowering stage is left uncontrolled. P. viticola management consumes a significant amount of classical pesticides applied in vineyards, requiring efficient and environmentally safe disease management options. Spray-induced gene silencing (SIGS), through the application of exogenous double-stranded RNA (dsRNA), has shown promising results for the management of diseases in crops. Here, we developed and tested the potential of dsRNA targeting P. viticola Dicer-like (DCL) genes for SIGS-based crop protection strategy. The exogenous application of PvDCL1/2 dsRNA, a chimera of PvDCL1 and PvDCL2, highly affected the virulence of P. viticola. The reduced expression level of PvDCL1 and PvDCL2 transcripts in infected leaves, treated with PvDCL1/2 dsRNA, was an indication of an active RNA interference mechanism inside the pathogen to compromise its virulence. Besides the protective property, the PvDCL1/2 dsRNA also exhibited a curative role by reducing the disease progress rate of already established infection. Our data provide a promising future for PvDCL1/2 dsRNA as a new generation of RNA-based resistant plants or RNA-based agrochemical for the management of downy mildew disease in grapevine.

RNA Interference Strategies for Future Management of Plant Pathogenic Fungi: Prospects and Challenges.

Plant pathogenic fungi are the largest group of disease-causing agents on crop plants and represent a persistent and significant threat to agriculture worldwide. Conventional approaches based on the use of pesticides raise social concern for the impact on the environment and human health and alternative control methods are urgently needed. The rapid improvement and extensive implementation of RNA interference (RNAi) technology for various model and non-model organisms has provided the initial framework to adapt this post-transcriptional gene silencing technology for the management of fungal pathogens. Recent studies showed that the exogenous application of double-stranded RNA (dsRNA) molecules on plants targeting fungal growth and virulence-related genes provided disease attenuation of pathogens like Botrytis cinerea, Sclerotinia sclerotiorum and Fusarium graminearum in different hosts. Such results highlight that the exogenous RNAi holds great potential for RNAi-mediated plant pathogenic fungal disease control. Production of dsRNA can be possible by using either in-vitro or in-vivo synthesis. In this review, we describe exogenous RNAi involved in plant pathogenic fungi and discuss dsRNA production, formulation, and RNAi delivery methods. Potential challenges that are faced while developing a RNAi strategy for fungal pathogens, such as off-target and epigenetic effects, with their possible solutions are also discussed.

Using a mentorship model to localise the Practical Approach to Care Kit (PACK): from South Africa to Ethiopia.

The Federal Ministry of Health, Ethiopia, recognised the potential of the Practical Approach to Care Kit (PACK) programme to promote integrated, comprehensive and evidence-informed primary care as a means to achieving universal health coverage. Localisation of the PACK guide to become the 'Ethiopian Primary Health Care Clinical Guidelines' (PHCG) was spearheaded by a core team of Ethiopian policy and technical experts, mentored by the Knowledge Translation Unit, University of Cape Town. A research collaboration, ASSET (heAlth Systems StrEngThening in sub-Saharan Africa), has brought together policy-makers from the Ministry of Health and health systems researchers from Ethiopia (Addis Ababa University) and overseas partners for the PACK localisation process, and will develop, implement and evaluate health systems strengthening interventions needed for a successful scale-up of the Ethiopian PHCG. Localisation of PACK for Ethiopia included expanding the guide to include a wider range of infectious diseases and an expanded age range (from 5 to 15 years). Early feedback from front-line primary healthcare (PHC) workers is positive: the guide gives them greater confidence and is easy to understand and use. A training cascade has been initiated, with a view to implementing in 400 PHC facilities in phase 1, followed by scale-up to all 3724 health centres in Ethiopia during 2019. Monitoring and evaluation of the Ministry of Health implementation at scale will be complemented by indepth evaluation by ASSET in demonstration districts. Anticipated challenges include availability of essential medications and laboratory investigations and the need for additional training and supervisory support to deliver care for non-communicable diseases and mental health. The strong leadership from the Ministry of Health of Ethiopia combined with a productive collaboration with health systems research partners can help to ensure that Ethiopian PHCG achieves standardisation of clinical practice at the primary care level and quality healthcare for all.

Obstetric hemorrhage and safe blood for transfusion in Ethiopia: the challenges of bridging the gap.

BACKGROUND: Obstetric hemorrhage is a leading cause of maternal death in sub-Saharan Africa, and the shortage of blood for transfusion is a contributory factor. In Ethiopia, the National Blood Bank Service continues to be confronted with challenges in its efforts to ensure the availability of blood for health care facilities. This paper reviews the available data on the contribution of obstetric hemorrhage to maternal mortality and examines the current status of the blood supply in Ethiopia. STUDY DESIGN AND METHODS: We reviewed the published literature and data from the Ethiopian Federal Ministry of Health. To assess the status of the current blood supply, we applied the five cornerstones of a safe and effective blood donor service advocated by the World Health Organization. RESULTS: Our review indicates that there are insufficient national data on the prevalence of obstetric hemorrhage and the contribution of blood supply shortage to maternal death. Also, transfusion safety may be compromised by inadequate testing of donated blood and ineffective hospital transfusion policies. CONCLUSION: To overcome the shortage of blood to treat obstetric hemorrhage, the first step is to evaluate the demand and supply gap by acquiring comprehensive data on the current status of the blood supply and the prevalence of obstetric hemorrhage in Ethiopia. Subsequent steps would include the implementation of transfusion policies, the optimization of whole blood collection, ensuring quality-assured testing of donated blood, and the implementation of transfusion guidelines for the appropriate use of blood products. Strategies for long-term, viable solutions to maintain an adequate blood supply should be simultaneously developed.

Genetic diversity of hepatitis C virus in Ethiopia.

Hepatitis C virus (HCV) is genetically highly divergent and classified in seven major genotypes and approximately hundred subtypes. These genotypes/subtypes have different geographic distribution and response to antiviral therapy. In Ethiopia, however, little is known about their molecular epidemiology and genetic diversity. The aim of this study was to investigate the distribution and genetic diversity of HCV genotypes/subtypes in Ethiopia, using 49 HCV RNA positive samples. HCV genotypes and subtypes were determined based on the sequences of the core and the nonstructural protein 5B (NS5B) genomic regions. Phylogenetic analysis revealed that the predominant was genotype 4 (77.6%) followed by 2 (12.2%), 1 (8.2%), and 5 (2.0%). Seven subtypes were identified (1b, 1c, 2c, 4d, 4l, 4r and 4v), with 4d (34.7%), 4r (34.7%) and 2c (12.2%) as the most frequent subtypes. Consistent with the presence of these subtypes was the identification of a potential recombinant virus. One strain was typed as genotype 2c in the NS5B region sequence and genotype 4d in the core region. In conclusion, genotype 4 HCV viruses, subtypes 4d and 4r, are most prevalent in Ethiopia. This genotype is considered to be difficult to treat, thus, our finding has an important impact on the development of treatment strategies and patient management in Ethiopia.

Seroepidemiology of hepatitis B and C virus infections among blood donors in Ethiopia.

This study was conducted to investigate the prevalence of hepatitis B virus (HBV) and hepatitis C virus (HCV) infections among blood donors in different regions in Ethiopia. A total of 56 885 sera were tested for HBsAg and anti-HCV antibodies. Of these, 3.9% were found HBsAg-positive, 0.52% anti-HCV-positive, and 0.054% dual positive. HBV prevalence was relatively higher in Adama (5.91%) than Gondar (4.05%), Jimma (3.87%), Addis Ababa (3.75%), and Tigray (3.7%); and in males (4.64%) than females (2.1%). Overall, HBV and HCV prevalence increased with age. In conclusion, HBV and HCV seroprevalence among blood donors in Ethiopia is intermediate and low, respectively.