The Association between Vitamin D and Zinc Status and the Progression of Clinical Symptoms among Outpatients Infected with SARS-CoV-2 and Potentially Non-Infected Participants: A Cross-Sectional Study.

Although our results showed a trend for a lower serum concentration of 25(OH)D among moderate than asymptomatic or mild illness patients, these findings conflict with those of some previous studies showing strong protective effects of vitamin D.

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Finally, all clinical symptoms except constipation and hypothermia showed a decreasing trend from days 1 to 28 of the disease.

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We observed a marginally significant difference in terms of 25(OH)D concentration between patients with moderate illness (19 ± 12 ng/mL) compared to patients with asymptomatic and mild illness (29 ± 18 ng/mL) ( p = 0.054).

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