Table 1.
Demographics, risk factors, clinical features and influenza A subtype of patients including those assessable for co‐infection
| Assessable for both bacterial and viral co‐infection (Group 1, n = 93) | Assessable for any co‐infection (Group 2, n = 176)* | All patients (n = 198) | |
|---|---|---|---|
| Demographics | |||
| Median age (IQ range) | 48 (34–57 years) | 41·5 (27–55 years) | 38·0 (24–55 years) |
| Age < 18 years (%) | 5 (5·4) | 28 (15·9) | 41 (20·7) |
| Female sex (%) | 47 (50·5) | 98 (55·7) | 110 (55·6) |
| Risk factors (%) | |||
| Any co‐morbidity** | 53/93 (57·0) | 99/176 (53·2) | 111/198 (56·1) |
| Pregnancy | 9/92 (9·8) | 14/170 (8·2) | 17/192 (8·9) |
| Chronic lung disease | 34/92 (37·0) | 67/175 (38·3) | 72/197 (36·5) |
| Chronic heart disease | 12/92 (13·0) | 22/174 (12·6) | 25/196 (12·8) |
| Diabetes | 12/91 (13·2) | 28/173 (16·2) | 31/195 (15·9) |
| BMI ≥ 35 | 24/87 (27·6) | 38/153 (24·8) | 39/169 (23·1) |
| Influenza syndrome (as decided by clinician, %) | |||
| Viral pneumonitis | 41/90 (45·5) | 75/169 (44·4) | 82/191 (42·9) |
| Secondary bacterial pneumonia | 14/90 (15·6) | 19/169 (11·2) | 20/191 (10·5) |
| Exacerbation of airways disease | 13/90 (14·4) | 28/169 (16·6) | 31/191 (16·2) |
| Other respiratory syndrome | 9/90 (10·0) | 20/169 (11·8) | 24/191 (12·6) |
| Intercurrent illness with influenza A infection | 13/90 (14·4) | 27/169 (16·0) | 34/191 (17·8) |
| Influenza subtype (%) | |||
| Pandemic A/H1N109 | 79 (84·9) | 152 (86·4) | 174 (87·9) |
| Seasonal A/H3N2 | 10 (10·8) | 19 (10·8) | 19 (9·6) |
| Seasonal A/H1N1 | 1 (1·1) | 1 (0·6) | 1 (0·5) |
| Untyped | 3 (3·2) | 4 (2·3) | 4 (2·0) |
BMI, body mass index (calculated as weight in kilograms divided by height in metres squared).
*Includes 93 subjects assessable for both bacterial and viral co‐infection, 38 subjects assessable for viral infection only and 45 subjects assessable for bacterial infection only.
**Any co‐morbidity: Pregnancy, Chronic lung disease, Chronic heart disease, Diabetes or Obesity (BMI > 35).