| Title |
Genotype-independent association between profound vitamin D deficiency and delayed sputum smear conversion in pulmonary tuberculosis
|
|---|---|
| Published in |
BMC Infectious Diseases, July 2015
|
| DOI | 10.1186/s12879-015-1018-5 |
| Pubmed ID | |
| Authors |
Kashaf Junaid, Abdul Rehman, Tahir Saeed, David A. Jolliffe, Kristie Wood, Adrian R. Martineau |
| Abstract |
Both vitamin D deficiency and genetic variants in the vitamin D receptor (VDR) have been reported to associate with delayed response to intensive-phase therapy for pulmonary tuberculosis. Studies investigating the influence of genetic variants in vitamin D binding protein (DBP) and vitamin D 25-hydroxylase (CYP2R1) on vitamin D status and response to antituberculous therapy are lacking. We conducted a longitudinal study in 260 patients initiating treatment for smear-positive pulmonary tuberculosis in Lahore, Pakistan. Vitamin D status and genotypes for polymorphisms in VDR (rs2228570, rs731236, rs1544410), DBP (rs7041, rs4588) and CYP2R1 (rs2060793, rs10500804, rs10766197) were determined at baseline. Sputum smear microscopy was performed at 2, 4, 6 and 8 weeks, and time to sputum smear conversion was estimated for each participant. Analyses were conducted to determine demographic, clinical and genetic determinants of baseline vitamin D status and time to sputum smear conversion. Profound vitamin D deficiency (serum 25[OH]D < 25 nmol/L) was highly prevalent at TB diagnosis (present in 54 % of patients), and was independently associated with female vs. male sex (adjusted OR 2.60, 95 % CI 1.50 to 4.52, P = 0.001), recruitment in October to March inclusive (adjusted OR 1.75, 95 % CI 1.00 to 3.04, P = 0.047) and bilateral vs. unilateral disease (adjusted OR 1.89, 95 % CI 1.49 to 4.52 P = 0.025). Profound vitamin D deficiency was also independently associated with impaired response to antituberculous therapy (median time to sputum smear conversion 22.5 vs. 7.5 days for patients with serum 25[OH]D <25 nmol/L vs. ≥ 25 nmol/L, respectively; aHR 4.36, 95 % CI 3.25 to 6.65, P < 0.001). No polymorphisms in VDR, CYP2R1 and DBP studied associated with either baseline vitamin D status or time to sputum smear conversion. Profound vitamin D deficiency is very common among TB patients in Lahore, Pakistan, and is independently associated with significantly delayed sputum smear conversion. Polymorphisms in VDR, CYP2R1 and DBP did not associate with baseline vitamin D status or response to intensive-phase treatment in this patient group. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 84 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| India | 1 | 1% |
| South Africa | 1 | 1% |
| Unknown | 82 | 98% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 15 | 18% |
| Lecturer | 11 | 13% |
| Researcher | 9 | 11% |
| Student > Bachelor | 7 | 8% |
| Student > Ph. D. Student | 5 | 6% |
| Other | 15 | 18% |
| Unknown | 22 | 26% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 34 | 40% |
| Nursing and Health Professions | 7 | 8% |
| Biochemistry, Genetics and Molecular Biology | 6 | 7% |
| Agricultural and Biological Sciences | 5 | 6% |
| Business, Management and Accounting | 2 | 2% |
| Other | 8 | 10% |
| Unknown | 22 | 26% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 21 July 2015.
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#18,418,919
of 22,817,213 outputs
Outputs from BMC Infectious Diseases
#5,599
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Outputs of similar age from BMC Infectious Diseases
#122
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