The purpose of this study is to evaluate the effect of tozorakimab, as an add-on to SoC in patients with viral lung infection requiring supplemental oxygen, on the prevention of death or progression to IMV/ECMO.

Inclusion Criteria:

• Adult participants ≥ 18 years old at the time of signing the informed consent form.
• Patients hospitalised with viral lung infection.
• Hypoxaemia requiring treatment with supplemental O2.

Hypoxaemia is defined as:

SpO2 ≤ 90% OR

SpO2 ≤ 92% AND one or both of the following:

Radiographic infiltrates by CXR/CT compatible with viral lung infection per investigator judgement.

Use of accessory muscles of respiration or RR (respiratory rate) > 22.

- Patient remains hypoxaemic at randomisation requiring treatment with supplemental oxygen.

Exclusion Criteria:

• Known fungal or parasitic lung infection, aspiration lung infection, lung abscess, or evidence of septic shock. Bacterial co-infection is allowed, unless, in the opinion of the investigator, bacterial infection defines the severity of the participant's condition.
• Hypoxaemia caused primarily by extrapulmonary insult or by lung injury of non-infective aetiology.
• Ongoing IMV/ECMO at randomisation.

Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal.

All request will be evaluated as per the AZ disclosure commitment:

https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure. Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.

AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA Pharma Data Sharing Principles. For details of our timelines, please rerefer to our disclosure commitment at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

When a request has been approved AstraZeneca will provide access to the deidentified individual patient-level data in an approved sponsored tool . Signed Data Sharing Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information. Additionally, all users will need to accept the terms and conditions of the SAS MSE to gain access. For additional details, please review the Disclosure Statements at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.