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  • Title: Association between tuberculosis, diabetes and 25 hydroxyvitamin D in Tanzania: a longitudinal case control study.
    Author: Boillat-Blanco N, Bovet P, Ramaiya KL, Mganga M, Minja LT, Saleh L, Imboden M, Schindler C, Gagneux S, Daubenberger C, Reither K, Probst-Hensch N.
    Journal: BMC Infect Dis; 2016 Nov 03; 16(1):626. PubMed ID: 27809789.
    Abstract:
    BACKGROUND: Vitamin D level is inversely associated with tuberculosis (TB) and diabetes (DM). Vitamin D could be a mediator in the association between TB and DM. We examined the associations between vitamin D, TB and DM. METHODS: Consecutive adults with TB and sex- and age-matched volunteers were included in a case-control study in Dar es Salaam, Tanzania. Glycemia and total vitamin D (25(OH)D) were measured at enrolment and after TB treatment in cases. The association between low 25(OH)D (<75 nmol/l) and TB was evaluated by logistic regression adjusted for age, sex, body mass index, socioeconomic status, sunshine hours, HIV and an interaction between low 25(OH)D and hyperglycemia. RESULTS: The prevalence of low 25(OH)D was similar in TB patients and controls (25.8 % versus 31.0 %; p = 0.22). In the subgroup of patients with persistent hyperglycemia (i.e. likely true diabetic patients), the proportion of patients with low 25(OH)D tended to be greater in TB patients (50 % versus 29.7 %; p = 0.20). The effect modification by persistent hyperglycemia persisted in the multivariate analysis (pinteraction = 0.01). CONCLUSIONS: Low 25(OH)D may increase TB risk in patients with underlying DM. Trials should examine if this association is causal and whether adjunct vitamin D therapy is beneficial in this population.
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