Exploring Safety & Clinical Benefit of Anti-Influenza Immunoglobulin Intravenous in Hospitalized Adults With Influenza A

Inclusion criteria

• Provision of voluntary informed consent in writing by patient, or legally authorized representative.
• Age ≥ 18 years of age.
• Locally determined positive influenza A infection (Rapid Antigen (Ag) Test or PCR) from a specimen obtained within 2 days prior to randomization.
• Onset of symptoms ≤ 6 days before randomization, defined as when the patient first experienced at least one respiratory symptom or fever.
• Hospitalized (or in observation unit) with influenza, with anticipated hospitalization for more than 24 hours and will be/already are receiving antiviral SOC.
• Experiencing ≥ 1 respiratory symptom (ex. cough, sore throat, nasal congestion) and ≥ 1 constitutional symptom (ex. headache, myalgia, feverishness or fatigue).
• For women of child-bearing potential: willingness to abstain from sexual intercourse or use at least 1 form of hormonal or barrier contraception through Day 60 of the study.
• Willingness to have blood and respiratory samples obtained and stored.
• National Early Warning Score (NEW score) ≥ 3 at screening.

Exclusion criteria

• Use of any investigational product within the past 30 days prior to screening.
• History of hypersensitivity to blood or plasma products (as judged by the site investigator).
• History of allergy to latex or rubber.
• Known medical history of IgA deficiency.
• Pregnancy or lactation.
• Medical conditions for which receipt of a 500 mL volume of intravenous fluid may be dangerous to the patient (e.g. decompensated congestive heart failure), based on investigator's medical opinion with careful consideration of lab results.
• Liver function: liver function test (LFT) > 2.5 times upper limit of normal (ULN).
• Renal Function: glomerular filtration rate (GFR) < 60 mL/min/1.73 m2 (age and sex adjusted).
• A pre-existing condition or use of a medication that, in the opinion of the site investigator, may place the individual at a substantially increased risk of thrombosis (e.g. cryoglobulinemia, severe refractory hypertriglyceridemia, or clinically significant monoclonal gammopathy).
• An opinion of the investigator that it would be unwise to allow participation of the patient in the study (the reason for exclusion of the patient must be documented).
• Receiving extracorporeal membrane oxygenation (ECMO).
• Anticipated life expectancy of < 90 days.
• Confirmed bacterial pneumonia or any concurrent respiratory viral infection that is not influenza A (ex. respiratory syncytial virus (RSV) infection).