Results
A total of 1031 articles were obtained using the electronic strategy search. After removing of 78 duplicate articles, 1453 study were remained for screening. Then, the full‐text of the articles was evaluated and 1289 irrelevant articles were excluded. At the eligibility check stage, 164 articles were examined and 155 of them were omitted. Finally, 9 articles were included in this meta-analysis review, according to PRISMA (Preferred reporting items for systematic review and meta‐analysis) guideline. Figure 1 shows the review process for the included studies.
Accordingly, this Meta-analysis shows the estimation of the influenza prevalence among patients infected with COVID-19 (Table 1). In nine cross sectional studies, the influenza prevalence among patients infected with COVID-19 varied from 0.08 in Nowak study to 49.46% in Simin Ma study. In the present study the clinical characterization among patients infected with COVID-19 and influenza is shown in Table 2.