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Depuis la première émergence du SRAS-CoV-2 fin 2019, de nouveaux variants du virus continuent d'émerger, entraînant des changements dans la sévérité de la maladie, compromettant l'efficacité de la vaccination et des traitements. Conformément aux recommandations internationales pour la surveillance génomique des agents pathogènes, le Burkina Faso a mis en place un système national de surveillance des variants du SRAS-CoV-2 adapté à son contexte pour suivre la dynamique du virus dans le pays. Nous décrivons ici la mise en place de ce système.

Depuis 2017, la dengue évolue au Burkina Faso sous forme endémique. Comme dans d'autres pays africains, les données disponibles sur la dengue au Burkina Faso sont très limitées. La présente étude vise à déterminer la séroprévalence et à identifier les facteurs démographiques de risque de la dengue au sein des populations vivant au Burkina Faso.

The performance of three small irrigation systems located in the central and the centre eastern regions of Burkina Faso has been analysed at the field level, using two performance indicators:

The performance of three small irrigation systems located in the central and the centre eastern regions of Burkina Faso has been analysed at the field level, using two performance indicators: 1Relative water supply (RWS) to assess the adequacy of “irrigation supply and effective rainfall” and the crop water requirement;2Water productivity (Pe) to assess water use efficiency.The results show that the average value of RWS of wet‐season rice fields is very high (1.3) at Gorgo, medium (1.04) at Mogtedo and very low (0.75) at Itenga. The average value of water productivity is high (0.88 kg m−3) at Itenga, medium (0.65 kg m−3) at Mogtedo and low (0.34 kg m−3) at Gorgo.

Black pod, caused by Phytophthoraspp. is one of the most important diseases of cacao occurring worldwide. Losses due to black pod caused by P. palmivoraare still moderate in Côte d'Ivoire but P. megakaryacauses high losses in Ghana and other Central African countries. Variation in field attack has been observed between cacao genotypes, but evaluation of pod losses is unsuitable for obtaining rapid progress in breeding. Results of inoculation tests using young detached leaves, twigs and roots, obtained from field and nursery plants, are presented here and compared to field resistance of similar genotypes observed over a 10-year period. Nine different Upper Amazon Forastero genotypes were tested together with progenies obtained by crossing these with the susceptible check IFC5 (Amelonado genotype). Rank correlations between the early screening tests and the level of field attack were positive and mostly significant (r=0.58–0.95). The coefficient of correlation was slightly higher for leaves (r=0.88) and roots (r=0.89) than for twigs (r=0.76). Also, resistance of the different plant organs was correlated (r=0.6–0.9). Resistance of the Upper Amazon parents was well correlated with the resistance of their cross progenies (r=0.7–0.9), suggesting that resistance is highly heritable. Resistance of leaves and twigs from the nursery was better correlated with field resistance than resistance of leaves and twigs from the field, which might result from more uniform growing conditions in the nursery. Inoculation of leaves appears the most suitable early screening method for black pod resistance. Application of this test in breeding more resistant cacao cultivars is discussed.

A recent randomized controlled trial, the WANECAM (West African Network for Clinical Trials of Antimalarial Drugs) trial, conducted at seven centers in West Africa, found that artemether-lumefantrine, artesunate-amodiaquine, pyronaridine-artesunate, and dihydroartemisinin-piperaquine all displayed good efficacy. However, artemether-lumefantrine was associated with a shorter interval between clinical episodes than the other regimens.