Table 3 Secondary infection risks (SIR) of influenza A (H1N1-2009) in relation to the timing of prophylaxis, containment measures and other factors
Authors | SIR % (95% CI) with prophylaxis | Time to start prophylaxis | Containment measures other than contact tracing and chemoprophylaxis | Report of H275Y mutant | No. of cases with pneumonia | No. of deaths |
|---|---|---|---|---|---|---|
Baz et al. [18] | 25.0 (0, 67.4) | 0–2 days | N/A | Yes | N/A | N/A |
Calatayud et al. [19] | 0 | 0–10 days | School closure | No | N/A | N/A |
CDC [20] | 0 | 0–4 days | Movement to care unit | No | 0 | 0 |
CDC [20] | 2.1 (0.4, 3.8) | N/A | Movement restriction, Facility closure to new admission and visitors | No | N/A | N/A |
CDC [20] | 17.9 (15.5, 20.3) | within 24 hours | Restriction of visiting | No | N/A | N/A |
Fallo et al. [21] | 10.9 (7.2, 14.7) | N/A | N/A | No | N/A | N/A |
France et al. [22] | 4.0 (0, 9.4) | N/A | N/A | No | N/A | N/A |
Iioka et al. [23] | 12.2 (3.1, 21.4) | immediately after illness onset in index case | Refusal of new admission, Entry restriction | Yes | 3 (50%) | 3 (50%) |
Jackson et al. [24] | 37.1 (6.7, 67.5) | N/A | N/A | No | N/A | N/A |
Komiya et al. [6] | 0.6 (0, 1.4) | median 2 days (quartiles: 0–7) | Staying at home | Yes | N/A | N/A |
Kute et al. [25] | 0 | N/A | N/A | No | 0 | 0 |
Leung et al. [26] | 0 | N/A | School closure | No | 0 | 0 |
Lisena et al. [27] | 0 | 1–2 days | N/A | No | 0 | 0 |
Maltezou et al. [28] | 0 | N/A | N/A | No | 0 | 0 |
Morgan et al. [29] | 19.6 (11.5, 27.7) | N/A | N/A | No | N/A | N/A |
Pannaraj et al. [30] | 0 | N/A | N/A | No | 0 | 0 |
Tsagris et al. [31] | 5.0 (0, 14.5) | N/A | N/A | No | 1 (100%) | 0 (0%) |
van Gemert et al. [32] | 1.8 (0, 5.2) | median 6 days | Separation and restriction of movement in their homes | No | N/A | N/A |
Weston et al. [33] | 2.4 (0, 5.7) | 1–2 days | Quarantine | No | N/A | N/A |