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Summary: Antibody titres in 462 patients with haematological malignancies after the second (D2) and third (D3) SARS‐CoV‐2 vaccine were compared with those of healthy controls (HCs). Significant decay of antibody titre was observed pre D3, but titre surged post D3. The number of seronegative patients decreased from 79 (17.1%) to 44 (9.5%) from post D2 to post D3, and patients with adequate antibody titre increased from 204 (44.2%) to 358 (77.5%). Of the patients who received B‐cell‐targeted therapy, 80% were seronegative and 71% remained seronegative after D3. CD19+, CD4+, CD8+ cell counts, and immunoglobulin G (IgG) levels were identified as independent predictors for adequate serologic response. [ABSTRACT FROM AUTHOR]

• The patient developed leg pain and livedo reticularis after mRNA-1273 vaccination. • His blood creatine kinase level was markedly elevated and MRI showed myositis. • He developed rhabdomyolysis and died of multiorgan failure. • Histopathology of autopsy specimens revealed systemic arteriole thrombosis. • Vaccine-induced complement activation syndrome may have caused the lesions. We report a case of a Japanese man with severe rhabdomyolysis and multiple thrombosis of arterioles after the first dose of mRNA-1273 vaccine. He developed rapidly progressive rhabdomyolysis and infarctions of multiple organs. Antiplatelet factor 4 antibody test was negative. Despite the intensive supportive care, including aggressive fluid administration, hemodialysis, administration of anticoagulants, high-dose steroid, and eculizumab, the patient ultimately died of multiple organ failure. Autopsy revealed multiple thrombosis in the arterioles and organ necrosis. Low serum complements and C3 deposition in the renal glomeruli detected by immunofluorescence suggested a possible immune-mediated mechanism. To our knowledge, this is the first case report of rhabdomyolysis and multiple thrombosis of the arterioles as an adverse event following COVID-19 vaccination. [ABSTRACT FROM AUTHOR]