FIGURE 3.

Meta‐analysis of respiratory viral co‐infection prevalence among COVID‐19 subgroups (Figure S2–S6). Abbreviations: CI, confidence interval; SARS‐CoV‐2, Severe acute respiratory syndrome‐related coronavirus. ^aPatients under the age of 18 years. ^bSize of SARS‐CoV‐2 positive patients tested for co‐infection. ^cContinents Africa and Oceania are not demonstrated, since only one study was identified for each of them ²⁷ , ²⁸ . ^dSummer is not showed, since studies that screened COVID‐19 patients for co‐infections during the summer months overlap with the Spring or Autumn season. Studies from tropical geographic regions (N = 2 ²⁹ , ³⁰ ) have been left out because they only experience a dry and a wet season.