- patients with exclusion criteria to the corimuno-19 cohort. - age ≥ 70 years - pregnancy or lactation - history or unresolved neisseria meningiditis infection - ongoing sepsis, presence or suspicion of active and untreated systemic bacterial infection prior study screening and untreated with antibiotics, - hypersensitivity to any ingredient contained in eculizumab, including hypersensitivity to murine proteins.

- patients with exclusion criteria to the corimuno-19 cohort. - age ≥ 70 years - pregnancy or lactation - history or unresolved neisseria meningiditis infection - ongoing sepsis, presence or suspicion of active and untreated systemic bacterial infection prior study screening and untreated with antibiotics, - hypersensitivity to any ingredient contained in eculizumab, including hypersensitivity to murine proteins.