Table 2.
Incidence Rates of Norovirus Genogroup I and II Detection Among 199 Children, by Age Group and Site
| Age Group and Site | Total Episodes With a GI Sample Associated | Total Episodes With a GII Sample Associated | GI/GII Coinfections | GI Incidence (95% CI) | GII Incidence (95% CI) |
|---|---|---|---|---|---|
| Age group | |||||
| 0–5 mo | 41 | 98 | 6 | 3.86 (2.77–5.11) | 8.99 (7.38–10.96) |
| 6–11 mo | 57 | 153 | 10 | 5.01 (3.86–6.49) | 13.43 (11.47–15.74) |
| 12–17 mo | 39 | 61 | 6 | 4.88 (3.57–6.68) | 7.64 (5.94–9.82) |
| 18–24 mo | 20 | 34 | 1 | 2.02 (1.30–3.13) | 3.43 (2.45–4.80) |
| Country | |||||
| Asia | |||||
| Bangladesh | 34 | 49 | 7 | 6.96 (4.97–9.74) | 10.03 (7.58–13.27) |
| India | 31 | 54 | 1 | 5.84 (4.11–8.30) | 10.17 (7.79–13.28) |
| Nepal | 1 | 16 | 1 | 1.87 (.03–1.33) | 2.99 (2.83–4.88) |
| Pakistan | 18 | 52 | 1 | 3.14 (1.98–4.98) | 9.06 (6.90–11.89) |
| Africa | |||||
| South Africa | 23 | 43 | 5 | 5.09 (3.38–7.66) | 9.52 (7.06–12.83) |
| Tanzania | 6 | 40 | 0 | 1.14 (.51–2.55) | 7.63 (5.60–10.40) |
| South America | |||||
| Brazil | 14 | 21 | 1 | 3.87 (2.29–6.54) | 5.81 (3.79–8.91) |
| Peru | 30 | 71 | 7 | 5.44 (3.81–7.78) | 12.88 (10.21–16.25) |
Incidence expressed as number of detections per 100 child-months. All detections, whether asymptomatic or diarrheal, were considered episodes for the calculation of incidence rates. Incidence rates for GI and GII groups were inclusive of coinfection.
Abbreviations: CI, confidence interval; GI, norovirus genogroup I; GII, norovirus genogroup II.