HealthDay
For the new study, Meltzer's team tracked coronavirus infections among 489 patients whose vitamin D levels were measured within a year before they were tested for the new coronavirus. While the study couldn't determine cause and effect, patients with an untreated vitamin D deficiency (blood levels of less than 20 ng/mL) were nearly two times more likely to test positive for the coronavirus than patients with sufficient vitamin D levels, the researchers said.