Development of severe respiratory disease; defined as a respiratory rate of 30 breaths per minute or more; an oxygen saturation of less than 93% while the patient was breathing ambient air; or both; measured for up to 60 days from baseline.

Development of severe respiratory disease; defined as a respiratory rate of 30 breaths per minute or more; an oxygen saturation of less than 93% while the patient was breathing ambient air; or both; measured for up to 60 days from baseline.