A suggestive set of numbers was published online in April by a medical scientist in the Philippines, Dr Mark Alipio. Of 49 patients with mild symptoms of Covid-19 in three hospitals in southern Asian countries, only two had low levels of vitamin D; of 104 patients with critical or severe symptoms, only four did not have low levels of vitamin D. The more severe the symptoms, the more likely a patient was to be not just low but deficient in the vitamin. Could vitamin D deficiency make the difference between getting very ill or not?

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