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The representative patient information of the three groups, as well as the detection time and results of PPHM COVID−19. (A) A total of 14 patients of group 1 obtained an earlier diagnosis because of a situation in which two or more anti-ECSP IgGs entered the sero-positive period earlier than the anti-RBD IgG; (B) 17 patients were categorized into Group 2; (C) 9 patients were categorized into Group 3.
