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Even without an established signature of the disease, a few companies have already begun work on their own long COVID tests. QMC Health, for example, said last month it was developing a blood-based assay using biomarkers discovered at Lawson Health Research Institute in Ontario . Lawson officials separately announced in October that machine learning had identified elevated concentrations of the vascular transformation proteins ANG-1 and P-SEL as useful to classify long COVID with 96 percent accuracy.

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