| Aetiological agent | |||||||
| Rhinovirus(n = 31) | Influenza A(n = 23) | Influenza B(n = 6) | RSV(n = 12) | Adenovirus(n = 11) | Parainfluenza virus(n = 6) | Coronavirus(n = 6) | |
| Male | 15 (48) | 15 (65) | 2 (33) | 8 (67) | 6 (55) | 3 (50) | 4 (67) |
| Age (years) (median (IQR)) | 66 (42–78) | 66 (55–76) | 72 (68–83) | 79 (70–81) | 51 (30–71) | 81 (73–86) | 71 (55–78) |
| Duration symptoms (days) (median (IQR)) | 7 (3–7) | 7 (3–21) | 6 (4–14) | 6 (4–18) | 3 (2–7) | 6 (4–7) | 6 (4–14) |
| Symptoms | |||||||
| Cough | 29/31 (94) | 21/22 (96) | 5/6 (83) | 12/12 (100) | 9/11 (82) | 6/6 (100) | 6/6/(100) |
| Sputum | 23/31 (74) | 16/22 (73) | 4/6 (67) | 10/12 (83) | 8/11 (73) | 2/5 (40) | 4/6 (67) |
| Pleuritic pain | 18/31 (58) | 8/23 (35) | 3/6 (50) | 4/12 (33) | 6/10 (60) | 2/5 (40) | 4/6 (67) |
| Rigors | 14/29 (48) | 5/11 (46) | 1/3 (33) | 2/8 (25) | 1/4 (25) | 2/3 (67) | 2/2 (100) |
| Lethargy | 26/30 (87) | 15/15 (100) | 4/4 (100) | 7/9 (78) | 5/6 (83) | 2/2 (100) | 3/3 (100) |
| Anorexia | 23/30 (77) | 13/14 (93) | 3/3 (100) | 6/9 (67) | 6/6 (100) | 0/2 (0) | 2/2 (100) |
| Diarrhoea | 5/30 (17) | 5/12 (42) | 3/4 (75) | 4/8 (50) | 2/6 (33) | 0/2 (0) | – |
| Headache | 12/29 (41) | 5/9 (56) | 1/2 (50) | 1/7 (14) | 1/4 (25) | 0/2 (0) | – |
| Myalgia | 7/27 (26) | 5/10 (50) | 2/2 (100) | 2/7 (29) | 2/5 (40) | 0/2 (0) | – |
| Any comorbidity | 18/31 (58) | 13/23 (57) | 3/6 (50) | 10/12 (83) | 7/11 (64) | 3/6 (50) | 4/6 (67) |
| COPD | 6/31 (19) | 8/23 (35) | 1/6 (17) | 4/12 (33) | 3/11 (27) | 2/6 (33) | 3/6 (50) |
| Asthma | 8/31 (26) | 3/23 (13) | 0/6 (0) | 1/12 (8) | 3/11 (27) | 0/6 (0) | 1/6 (17) |
| Cardiac failure | 2/31 (7) | 3/23 (13) | 1/6 (17) | 5/12 (42) | 3/11 (27) | 2/6 (33) | 0/6 (0) |
| Diabetes | 3/31 (10) | 3/23 (13) | 1/6 (17) | 6/12 (50) | 1/11 (9) | 0/6 (0) | 1/6 (17) |
| Cerebrovascular disease | 4/31 (13) | 3/23 (13) | 0/6 (0) | 5/12 (42) | 1/11 (9) | 2/6 (33) | 0/6 (0) |
| Renal disease | 1/31 (3) | 1/23 (4) | 1/6 (17) | 1/12 (8) | 1/11 (9) | 0/6 (0) | 0/6 (0) |
| Current smoker | 7/31 (23) | 7/23 (30) | 1/6 (17) | 1/12 (8) | 4/11 (36) | 1/6 (17) | 0/6 (0) |
| Influenza vaccine within 1 year | 16/31 (52) | 7/23 (30) | 2/5 (40) | 8/12 (67) | 5/11 (46) | 5/6 (83) | 2/6 (33) |
| CURBage >2 | 7/31 (23) | 2/23 (9) | 1/6 (17) | 4/12 (33) | 3/11 (27) | 3/6 (50) | 2/6 (33) |
| PSI class IV and V | 12/31 (39) | 15/23 (65) | 3/6 (50) | 9/12 (75) | 4/11 (36) | 5/6 (83) | 3/6 (50) |
| Multilobe disease | 13/31 (42) | 13/23 (57) | 4/6 (67) | 2/12 (17) | 3/11 (27) | 4/6 (67) | 2/6 (33) |
| Neutrophils >8×106/l | 29/31 (94) | 17/23 (74) | 5/6 (83) | 8/12 (67) | 10/11 (91) | 6/6 (100) | 5/6 (83) |
| Died during admission | 3/31 (10) | 2/23 (9) | 0/6 (0) | 0/12 (0) | 0/11 (0) | 1/6 (17) | 0/6 (0) |
| Died by 6 weeks | 3/31 (10) | 2/23 (9) | 0/6 (0) | 1/12 (8) | 0/11 (0) | 1/6 (17) | 0/6 (0) |
| ICU admission | 1/31 (3) | 2/23 (9) | 0/6 (0) | 0/12 (0) | 1/11 (9) | 0/6 (0) | 0/6 (0) |
Data are shown as number (%) unless otherwise specified.
COPD, chronic obstructive pulmonary disease; PSI, Pneumonia Severity Index.