Number of studies (n; % of total studies) by pathological and anatomical classifications
| Upper | General | Total | References | |
| All studies | 40 (83.3%) | 8 (16.7%) | 48 | |
| All general (undiagnosed) ARill | 16 (33.3%) | 1 (2.1%) | 17 (35.5%) | |
| Self-reported symptoms only | 6 (12.5.6%) | 1 (2.1%) | 7 (14.6%) | 32 52 87–91 |
| Self-reported symptoms with an algorithm | 7 (14.6%) | – | 7 (14.6%) | 28 31 68 92–95 |
| Symptoms reviewed by a physician, but without clinical or laboratory evaluation | 1 (2.1%) | – | 1 (2.1%) | 82 |
| Clinical diagnosis by a physician, based on history and examination | 2 (4.2%) | – | 2 (4.2%) | 38 39 |
| All infective (ARinf) | 24 (50.0%) | 7 (14.5%) | 31 (64.5%) | |
| Suspected infective | 19 (39.5%) | 7 (14.5%) | 26 (54%) | |
| Self-reported symptoms with an algorithm | 12 (25%) | 1 (2.1%) | 13 (27.1%) | 9 27 47 51 56 84 96–102 |
| Symptoms reviewed by a physician, but without clinical or laboratory evaluation | 1 (2.1%) | – | 1 (2.1%) | 103 |
| Clinical diagnosis by a physician, based on history and examination | 6 (12.5%) | 6 (12.5%) | 12 (25%) | 13 33 57 66 67 69 83 104–108 |
| Confirmed infective | ||||
| Diagnosis by a physician and confirmed by laboratory investigation to identify a specific pathogen | 5 (10.4%) | – | 5 (10.4%) | 10 40 43 46 109 |
The numbers and percentages in bold represent the total number and percentages for all studies, undiagnosed ARill and infective ARill, respectively.
ARill, acute respiratory illness; ARinf, acute respiratory infections.