Could long Covid’s signs of immune dysregulation in the blood lead to a diagnostic test?
New research has identified proteins in the blood of people with long Covid that could point the way to a much-needed diagnostic test.
Long Covid has long eluded scientists looking for its cause. Not knowing what triggers its persistent and distressing symptoms makes the condition challenging to treat; it’s hard to even say definitively who has it. New research published Thursday in Science has identified proteins present in the blood of people with long Covid that could point the way to a much-needed diagnostic test and possibly to future therapeutic targets.
Scientists at the University of Zurich discovered high levels of proteins involved in the complement system — an important part of the immune system bridging innate and adaptive responses — that were disrupted in people with long Covid symptoms, but not in those who got better after the initial Covid-19 infection or in those who had recovered from long Covid symptoms after six months. The team also found damaged red blood cells and platelets as well as signs of harm to the endothelial cells that line blood vessels.
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