Real-world effectiveness of azvudine for patients infected with the SARS-CoV-2 omicron subvariant BA.5 in an intensive care unit.

Background: Azvudine (FNC) has been shown to be effective against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), but data regarding the Omicron BA.5.1.3 subvariant are lacking. This retrospective analysis investigated the effectiveness and safety of FNC against the SARS-CoV-2 Omicron BA.5.1.3 subvariant in a real-world setting, utilizing data from a patient cohort at our institution. Methods: Data were retrospectively collected from patients admitted to the intensive care unit (ICU) of Sanya Central Hospital during the Sanya outbreak (August 13 to September 7, 2022). The patients, all infected with the Omicron BA.5.1.3 subvariant, were selected based on predefined inclusion and exclusion criteria. The patients were classified as the FNC (azvudine 5 mg, qd + standard supportive treatment) and non-FNC (standard supportive treatment only) groups. Results: The study comprised 13 patients, with 6 and 7 in the FNC and non-FNC groups, respectively. Baseline data, clinical features, and imaging manifestations were generally similar between the two groups. However, patients administered FNC demonstrated significantly lower levels of inflammatory indicators at baseline. Although there was no significant difference in the duration of ICU stay between the FNC and non-FNC groups, overall ICU stay appeared to be reduced in the FNC group. Conclusions: FNC emerges as a feasible treatment against the Omicron BA.5.1.3 subvariant. It may reduce ICU stay and demonstrate a promising safety profile without major side effects or disruption to normal physiological parameters.