High levels of circulating osteopontin in inflammatory lung disease regardless of Sars‐CoV‐2 infection

This study independently confirms increased levels of osteopontin in COVID‐19 patients but also suggests that osteopontin cannot be used as a biomarker of SARS‐CoV‐2 infection, as elevated levels of circulating osteopontin are found in inflammatory lung disease regardless of SARS‐CoV‐2 infection.