Data extraction
The following variables were extracted from the appropriate articles: first author, publication date, type of study, geographical regions, study language, number of SARS-CoV-2 confirmed patients, total influenza, influenza A, influenza B, co-infected patients with clinical characterization (fever, cough, fatigue, diarrhea, difficult breathing), radiological data (Chest CT). The information preparation was done in Microsoft excel spreadsheet and all statistical analyses were carried out via Comprehensive Meta Analysis V.2 software.