Inclusion/exclusion criteria
All articles with sufficient quality scores were included in meta-analysis following inclusion criteria: 1) All English studies. 2) Patients with confirmed diagnosis of COVID-19. 3) Studies based on prevalence of influenza among COVID -19 patients. 4) Reported prevalence of clinical characterization among co-infected patients. 5) Result of abnormalities inĀ chestĀ among co-infected patients.
The excluded studies were as follows: 1) Articles with no access to the full-text. 2) Case reports or case series studies. 3) Duplicated studies. 4) Studies published in languages other than English. 5) Abstracts, cases, and review studies. 6) Studies that did not report data on co-infection.