Chest radiography
Among the selected studies, the prevalence of CT abnormalities is reported in 5 articles comprising 272 patients and ranged from 83–100%. By combining the results of these 3 studies, the frequency of CT abnormalities in co-infected patients is (66.8% [95% CI 29.4–90.7, p < 0.001]). As there is heterogeneity between the results for CT abnormalities, the random-effects model was used for assessment. Figure 5 (F).
Figure 1: Flowchart of review process for the included studies
Table 1: Estimation of the influenza prevalence among patients infected with COVID-19