There are about 249 clinical studies being (or have been) conducted in Ghana. The country of the clinical trial is determined by the location of where the clinical research is being studied. Most studies are often held in multiple locations & countries.
The Ghana study will hypothesize that both the multiple dose and single dose of mebendazole will achieve effective cure rates against hookworm among children and adolescents. This study is intended to be a pilot study for a planned Phase 3 registration trial of a new drug for hookworm, tribendimidine.
The availability of data on plasma 25-Hydroxyvitamin D (25(OH)D) concentrations in the last two rounds of the National Health and Nutrition Examination Survey (NHANES) has generated a high level of interest in the consequences of 25(OH)D deficiency and in particular its potential impact on black Americans. Fundamental new questions about the biology of vitamin D have now come to the fore. Are low 25(OH)D-intact parathyroid hormone (iPTH) levels a physiologic "abnormality" in African Americans or does the 25(OH)D-iPTH system have sufficient plasticity to adapt to low sunlight exposure? Could the low 25(OH)D levels which result from the "gene- environment discordance" observed in dark skinned populations in the US be a risk factor for metabolic disorders? Ultimately, the public health community and regulatory bodies must offer recommendations for optimal levels and supplementation. The investigators propose to utilize cohorts from an ongoing NIH-funded study designed to identify determinants of weight change and cardiovascular disease risk in five Afro-origin populations [Modeling the Epidemiologic Transition Study (METS)] to examine these questions. The five METS countries include Ghana, Seychelles, South Africa, Jamaica and the US; the five populations differ greatly in terms of sun exposure and dietary intakes. In addition to the extensive energy expenditure, dietary intake and obesity-related metabolic markers being measured in METS, the investigators propose to assess plasma 25(OH)D, iPTH, serum and urinary calcium, plasma markers of bone resorption and formation, and quantitative ultrasound of the calcaneus. The associations of adiposity, weight change, cardiovascular disease (CVD) risk factors such as blood pressure and insulin, and bone strength with 25(OH)D and iPTH will be assessed. The proposed study will provide a comprehensive assessment of the distribution and determinants of 25(OH)D-iPTH and related physiologic measures across a wide range of latitude and lifestyles. These data should contribute substantially to the understanding of the "normal" range within which these hormones function and their significance in Afro- origin populations.
The purpose of this study is to evaluate the safety, tolerability, and effectiveness of 2 doses of a malaria vaccine (DNA) followed by a dose of another type of malaria vaccine (MVA) given as a "booster." Forty-eight adults in Ghana, ages 18-50 years, will participate for 17 months. They will be randomly assigned to 1 of 4 treatment groups. Group 1 will receive the DNA malaria vaccine at months 0 and 1, and the booster at month 7. Group 2 will receive a rabies vaccine at months 0 and 1, and an injection containing no vaccine at month 7. Group 3 will receive the DNA malaria vaccine at months 5 and 6, and the booster at month 7. Group 4 will receive the rabies vaccine at months 5 and 6, and an injection containing no vaccine at month 7. Blood samples and information regarding health problems that may occur after vaccination will be collected.