The missing test: Vitamin D, recurrent respiratory infection, and an overlooked workplace equity issue

Abstract

This editorial argues that Vitamin D deficiency—more common in people with darker skin and in low-sunlight climates—contributes to weakened immunity and worse outcomes from upper respiratory tract infections (URTIs), which already cause substantial morbidity, absenteeism, and productivity loss. Despite this link, current guidelines advise against routinely testing vitamin D levels even in high-risk groups presenting with URTIs.