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.