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Chinese COVID-19 study – 80 pct of severe cases had low Vitamin D, all asymptomatic cases had OK Vit D – Oct 13, 2020

Does Serum Vitamin D Level Affect COVID-19 Infection and Its Severity?-A Case-Control Study

Journal of the American College of Nutrition https://doi.org/10.1080/07315724.2020.1826005
Kun Ye,Fen Tang,Xin Liao,Benjamin A. Shaw,Meiqiu Deng,Guangyi Huang, show all

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Reported by Grassroots Health Nov 4, 2020


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As effective medication to treat COVID-19 is currently unavailable, preventive remedies may be particularly important.

To examine the relationship between serum 25-hydroxy vitamin D (25(OH)D) level and COVID-19 infection, its severity, and its clinical case characteristics.

This case-control study compared serum 25(OH)D levels and rates of vitamin D deficiency (VDD) between 80 healthy controls and 62 patients diagnosed with COVID-19 and admitted to Guangxi People’s Hospital, China, 2/16/2020–3/16/2020. Cases were categorized into asymptomatic, mild/moderate, and severe/critical disease. Logistic regression analysis was conducted to examine the associations between 25(OH)D level, or VDD, and case status/severity of COVID-19 while controlling for demographics and comorbidities. A threshold level of vitamin D for conveying COVID-19 risk was estimated.

Severe/critical COVID-19 cases were significantly older and had higher percentages of comorbidity (renal failure) compared to mild cases. The serum 25(OH)D concentration in COVID-19 patient was much lower than that in healthy control. And 25(OH)D level was the lowest in severe/critical cases, compared with mild cases. In further, significantly higher rates of VDD were found in COVID-19 cases (41.9%) compared to healthy controls (11.1%). And VDD was the greatest in severe/critical cases (80%), compared with mild cases (36%). These statistically significant associations remained even after controlling for demographics and comorbidities. A potential threshold of 25(OH)D (41.19 nmol/L) to protect against COVID-19 was identified.

Elderly and people with comorbidities were susceptible to severe COVID-19 infection. VDD was a risk factor for COVID-19, especially for severe/critical cases. While further confirmation is needed, vitamin D supplementation may have prevention or treatment potential for COVID-19 disease.

Created by admin. Last Modification: Thursday November 5, 2020 09:26:26 GMT-0000 by admin. (Version 4)

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