Background
Plasmodium vivax infection is known to be rare in West/Central Africa, the most accepted explanation being the lack of expression of erythroid Duffy antigen in the local human populations. Duffy negativity prevents the parasite to exploit the entry mechanism on the red blood cell surface. However, there are a growing number of reported vivax infections in Duffy-negative individuals. Data on P. vivax circulation in Cameroon are limited. The aim of the study was to evaluate the P. vivax presence, and its association with the Duffy genotype in West Cameroon.ResultsOverall, 484 blood samples were collected consecutively from febrile outpatients attending the Dschang’s Hospital (West Cameroon) during a 3-months period. Plasmodium vivax infection was detected by PCR in 5.6% (n = 27/484) of the cases, representing 38.6% (n = 27/70) of all Plasmodium infections detected. All P. vivax infected individuals showed a Duffy-negative genotype, and the frequency of Duffy-positive individuals in the whole tested population was 1.7%.ConclusionsThe results of this study confirm the circulation of P. vivax in Cameroon, as well as that the lack of expression of Duffy-antigen does not confer full protection against vivax malaria acquisition.
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Identification of inter-individual variability for drug metabolism through cytochrome P450 2B6 (CYP2B6) enzyme is important for understanding the differences in clinical responses to malaria and HIV. This study evaluates the distribution of CYP2B6 alleles, haplotypes and inferred metabolic phenotypes among subjects with different ethnicity in Botswana. A total of 570 subjects were analyzed for CYP2B6 polymorphisms at position 516 G > T (rs3745274), 785 A > G (rs2279343) and 983 T > C (rs28399499). Samples were collected in three districts of Botswana where the population belongs to Bantu (Serowe/Palapye and Chobe) and San-related (Ghanzi) ethnicity. The three districts showed different haplotype composition according to the ethnic background but similar metabolic inferred phenotypes, with 59.12%, 34.56%, 2.10% and 4.21% of the subjects having, respectively, an extensive, intermediate, slow and rapid metabolic profile. The results hint at the possibility of a convergent adaptation of detoxifying metabolic phenotypes despite a different haplotype structure due to the different genetic background. The main implication is that, while there is substantial homogeneity of metabolic inferred phenotypes among the country, the response to drugs metabolized via CYP2B6 could be individually associated to an increased risk of treatment failure and toxicity. These are important facts since Botswana is facing malaria elimination and a very high HIV prevalence.
Awareness is a preventive action to instill in individuals certain concepts to improve their health. It is an essential element in the prevention of sexually transmitted infection (STI)/HIV and early pregnancies among adolescents. In 2012, the prevalence of HIVin Cameroon was estimated at 4.3%. The young population appear to be the most affected (3.2%); very close to that of the Dschang Health District (Cameroon; 3.1%) in the 15-19 years age group. Theaimof this study was to evaluate the contribution of the Mobile Caravan project on the preventive aspect of STI/HIV/AIDS among youths of Dschang in 10 secondary schools within three years. 2029 students joined the project’s activities and 58.55% of them belonged to the age group of 16-21 years. Most students attended private schools. Nearly 3/4 of students (1515/2029) had an acceptable level of knowledge regarding STI/HIV/AIDS, which increased in number each year (from 641 to 716 students between 2012 and 2014). The Level of knowledge was significantly determinedby the study cycle (P=0.0004), the type of school (P=0.0027) and the year ofimplementation of activities (P=0.0026). The caravan project has greatly contributed to improving young peoples’ awareness on STI/HIV/AIDSin Dschang Municipality.
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