NORMAL HUMAN IMMUNOGLOBULINS (IVIG) IN PATIENTS AGED 75 YEARS AND OVER, COVID-19 WITH SEVERE ACUTE RESPIRATORY FAILURE

Inclusion Criteria: * Man or woman aged 75 and over * SARS-coV2 infection confirmed by RT-PCR or thoraco-pulmonary CT * Hospitalized in the acute general geriatrics unit of the Versailles Hospital Center * Patient rejected from resuscitation * Saturation ≤ 95% under oxygen therapy\> 5 L / min (i.e. PaO2 / FiO2≤200mmHg according to the Berlin definition of ARDS) by means of a nasal cannula, a high concentration facial mask or another device similar oxygen distribution Exclusion Criteria: * Patient under palliative care * Patient with contraindication to IV polyvalent Ig 1. . Hypersensitivity to the active substance or to any of the excipients (L-proline) 2. . Hypersensitivity to human immunoglobulins, especially when the patient has anti-IgA antibodies, 3. . Patients with type I or II hyperprolinemia * Patient under guardianship or curatorship * Patient receiving another experimental treatment as part of an interventional study * Moderate to severe dementia known: it must have been diagnosed before hospitalization and is defined by an MMSE \<20/30 or a neuropsychological assessment with a diagnosis made. * Patient not affiliated with a social security system in France * ADL patients \<4/6 and / or IADL \<6/8