CD79A and Miyoshi myopathy: However, the anti-spike antibody IgA level varied between different patients, of whom two MM patients (M4 and M6) were persistently negative, other MM patients (M1, M2, M3, M5, M7, M8) had persistent positivity, two severe patients (S2 and S3) were persistently positive, and one severe patient (S1) was persistently negative during hospitalization.