Diversity of tsetse flies and trypanosome species circulating in the highly infested cattle rearing area of the Faro and Deo subdivision, Adamawa region, Cameroon.

Animal African Trypanosomiasis (AAT) remains an animal health problem in sub-Saharan Africa and in Cameroon in particular. Despite more than 40 years of fighting against AAT in some tsetse infested areas, the disease prevalence is still a concern. Improving the control strategies in different settings requires to understand the current epidemiological situation of AAT. The aim of the present study was to update our knowledge on the diversity of tsetse fauna and trypanosome species in the tsetse infested area of Faro and Deo division, Adamawa region, Cameroon. Tsetse flies were caught using Vavoua trap in two villages and the apparent density per trap (ADP) were estimated. After morphological identification of tsetse fly species, flies were dissected and their midguts recovered. The presence of blood meal residues was recorded. Trypanosomes species were checked in the flies' midguts by microscopy followed by PCR method. The vertebrate taxa on which tsetse flies have taken blood meal were determined using the heteroduplex-PCR method. A total of 338 tsetse flies including 11 teneral flies (10 Glossina palpalis palpalis and 01 G. morsitans submorsitans) and 327 non-teneral were trapped in Mayo Lainde and Tchabal Mbabo. Amongst the caught tsetse flies, of the 327 non-teneral flies, 315 (96.3%) were G. p. palpalis, 8 (2.4%) were G. morsitans submorsitans and 4 (1.2%) G. fuscipes fuscipes. Trypanosome infections including Trypanosoma congolense forest (19.88%) and savanah (2.53%) "types", T. brucei s.l. (7.30%) and T. vivax (2.85%) were identified in 45.08% of non-teneral flies (32.38% for single infection and 12.70% for mixed infection). Amongst the 54 blood meals identified in tsetse midguts, 41% were from humans, 33% from cattle and 26% from other vertebrate hosts. About 51.9% of blood meals were found with various trypanosome species including 42.6% with T. congolense and 24% with T. brucei s.l. This study revealed the presence of three tsetse taxa and the circulation of four trypanosome taxa in villages of the Faro and Deo division. About 45% of captured tsetse fly are infected with trypanosome species causing AAT. Tsetse flies feed on humans, cattle and many other vertebrates. Strategies to eliminate the vectors must be improved to reduce the pathological impacts of trypanosome infections in this area.

G6PD variant distribution in sub-Saharan Africa and potential risks ofusing chloroquine/hydroxychloroquine based treatments forCOVID-19

Chloroquine/hydroxychloroquine have been proposed as potential treatments for COVID-19. These drugs have warning labels for use in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency. Analysis of whole-genome sequence data of 458 individuals from sub-Saharan Africa showed significant G6PD variation across the continent. We identified nine variants, of which four are potentially deleterious to G6PD function, and one (rs1050828) that is known to cause G6PD deficiency. We supplemented data for the rs1050828 variant with genotype array data from over 11,000 Africans. Although this variant is common in Africans overall, large allele frequency differences exist between sub-populations. African sub-populations in the same country can show significant differences in allele frequency (e.g. 16.0% in Tsonga vs 0.8% in Xhosa, both in South Africa, p = 2.4 x 10-3). The high prevalence of variants in the G6PD gene found in this analysis suggests that it may be a significant interaction factor in clinical trials of chloroquine and hydrochloroquine for treatment of COVID-19 in Africans.

Association between highly active antiretroviral therapy (HAART) and hypertension in persons living with HIV/AIDS at the Bamenda regional hospital, Cameroon.

INTRODUCTION: The introduction of highly active antiretroviral therapy (HAART) in the treatment of HIV infection has provided different good results: like long-term viral suppression, the decrease of opportunistic infections, and repair of the immune system. METHODS: We carried out a hospital-based cross-sectional analytic study involving 315 participants 228 were on HAART (group 1) and 87 were HAART-naïve (group 2) at the HIV treatment centre of the Bamenda regional hospital with our study population being all people living with HIV (PLWHIV) in the North West region of Cameroon. The sampling was performed from the 15th of March to the 30th of June 2017. The questionnaire was administered face to face with participants and their vital signs taken. Blood pressure was measured using an automated electronic blood pressure monitor and hypertension (HTN) was considered as systolic blood pressure (BP) ≥ 140 mmHg and/or diastolic BP ≥ 90mmHg. RESULTS: The prevalence of hypertension in the HAART group was 36.44% (n=82, CI: 30.15%-43.10%) compared to that of the HAART-naïve group which was 13.33% (n=12, CI: 7.08%-22.13%, P=0.01). HAART was associated with HTN after controlling for gender, family history of hypertension, body mass index (BMI), smoking and alcohol consumption. The odds ratio of the HAART-treated versus the HAART-naïve was 3.86 (95% CI: 1.98-7.50). We also found an association between TDF/3TC/EFV (OR=2.83), AZT/3TC/NVP (OR=2.82), AZT/3TC+EFV (OR=3.48) and TDF/3TC+NVP (OR=2.36) and HTN whereas those on AZT+3TC+ATV/r (OR=0.84) and TDF+3TC+ATV/r (OR=0.45) were not associated to hypertension. CONCLUSION: Our result suggests that blood pressure should be periodically measured and treated when necessary in PLWHIV on HAART.