A study of outcome in COVID-19 patients receiving casirivimab-imdevimab

In December 2019, coronavirus disease 2019 (COVID-19) was first identified in Wuhan, China, as a respiratory tract infection causing symptoms, such as fever, chills, dry cough, fatigue, and shortness of breath. Despite the low mortality rate of COVID-19, patients with comorbidities such as hypertension, cardiovascular disease, and diabetes mellitus seem to be prone to more severe symptoms and to a higher mortality rate than others. Such patients are shown to benefit from usage of monoclonal antibodies. Casirivimab-imdevimab is a cocktail made up of two non-competing, neutralizing human immunoglobulin G1 antibodies that target the receptor binding domain of the severe acute respiratory syndrome coronavirus 2 spike protein and block viral entry into human cells. We assessed the clinical profile and outcome of 42 patients who received the antibody cocktail. Casirivimab-imdevimab was administered to COVID-positive patients with mild severity. Forty-two patients who satisfied the inclusion criteria received casirivimab-imdevimab and were included in the study. Demographic and clinical data were tabulated in Microsoft Excel and statistics were run in OpenEpi software. No adverse reactions were seen in any of the patients. Among the 42 patients, there were no deaths. Twenty-two (52.3%) patients improved, while 20 (47.6%) worsened after receiving the antibody cocktail. Out of 21 (50%) patients who did not have any comorbidity, 13 (30.9%) worsened after receiving the drug and 8 (19%) improved, while among those with comorbidities, 7 (16.6%) worsened and 14 (33.3%) improved (P < 0.05). Thirteen (30.9%) unvaccinated patients improved, while 14 (33.3%) worsened, whereas 6 (14.2%) fully vaccinated patients improved while only 2 (4.7%) worsened. Among the patients who were administered the cocktail within 5 days of onset of symptoms, 12 (28.5%) improved and 10 (23.8%) worsened, whereas among those who received the drug between 6 and 10 days of symptom onset, ten improved, and ten worsened. There was no statistically significant association between vaccination status and outcome, and infusion interval and outcome in these patients. None of the 42 patients developed any reaction to casirivimab-imdevimab. There were no deaths in the study population. About 52.3% of the patients improved and 47.6% worsened after receiving the cocktail. About 33.3% of the comorbid patients improved. There was no statistically significant association between vaccination status and outcome, and infusion interval and outcome in these patients.