Trial Outcomes & Findings for A Six-Month Follow-Up Study of Participants With Coronavirus Disease 2019 (COVID-19) Previously Enrolled in a RO7496998 (AT-527) Study (NCT NCT05059080)

Participants diagnosed with COVID-19, who previously enrolled in a RO7496998 (AT-527) study (i.e. parent study NCT04889040 \[CV43043\]), were enrolled in this study after the end of the parent study.

For the study-specific baseline characteristic the number of participants indicates participants with data available for analysis at baseline.

COVID-19 symptoms were evaluated using the COVID-19 Symptom Diary. The COVID-19 Symptom Diary included the following 14 items: nasal congestion or runny nose, sore throat, cough, shortness of breath, muscle or body aches, fatigue, headache, chills/sweats, feeling hot or feverish, nausea, vomiting, diarrhea, sense of smell over the past 7 days and sense of taste over the past 7 days. The severity of items 1-12 were recorded on a 4-point Likert scale (i.e none/mild/moderate/severe). Items 13-14 were recorded on a 3-point Likert scale (i.e. same as usual/less than usual/no sense). Reported here is the percentage of participants with COVID-19 symptoms (mild/moderate/severe or less than usual/no sense) recorded during week 4 of each month following the baseline assessment.

The PROMIS-SF-Dyspnea Questionnaire is a 10-item questionnaire to evaluate the impact of dyspnea on specific activities. Participants self-assessed the severity of shortness of breath and difficulty of breathing in response to specific activities with a recall of the past 7 days. The PROMIS SF-Dyspnea Severity instrument is scored on a 4-point Likert scale, with an option to indicate that an activity had not been performed. Total score range is 0-30, where a higher score indicates a higher symptom severity of dyspnea.

The SGRQ is a 50-item respiratory-specific health-related quality of life instrument that measures health impairment. The questionnaire contains 3 domains: symptoms, activity, and impacts. Items were assessed on various response scales, including a 5-point Likert scale and True/False scale. Each scale is scored from 0 to 100, and the total score represents the weighted average of these three subscores. Higher scores correspond to worse quality of life. The SGRQ had a recall specification of 4 weeks.

COVID-19-related medically-attended visits were defined as hospitalization, ER visit, urgent care visit, physician's office visit, or telemedicine visit with the primary reason for the visit being COVID-19 or COVID-19-related symptoms.

Reinfection was defined as any nasopharyngeal (NP) swab that was positive for SARS-CoV-2 infection via reverse-transcriptase polymerase chain reaction (RT-PCR), taken when clinically indicated based on symptoms.

Post-treatment infections were defined as any adverse event with a primary system organ class of infections and infestations.

COVID-19 related complications included pneumonia, acute respiratory failure, sepsis, coagulopathy, pericarditis and/or myocarditis, and cardiac failure.

An AE is any untoward medical occurrence in a clinical investigation subject administered a pharmaceutical product, regardless of causal attribution. An AE can therefore be any of the following: any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the medicinal product, any new disease or exacerbation of an existing disease, recurrence of an intermittent medical condition not present at baseline or related to a protocol-mandated intervention.