Table 1.
Average annual incidence, average annual percent change in incidence, and case-fatality ratios for invasive H. influenzae serotype a disease, by age group—United States and Alaska, 2008–2017
| Age (years) | United States |
Alaska |
||||
|---|---|---|---|---|---|---|
| Estimated incidence (95% CI) | Average annual percent change in incidence (95% CI) | CFR, % | Incidence (95% CI) | Average annual percent change in incidence (95% CI) | CFR, % | |
| <1 | 1.60 (1.46-1.75) | 14.6 (11.4-17.8) | 6.2 | 24.73 (16.30-36.00) | 1.2 (−11.2-15.3) | 7.4 |
| 1-4 | 0.41 (0.36-0.45) | 5.6 (2.8-8.5) | 1.1 | 4.14 (2.45-6.54) | 17.7 (−0.8-39.5) | 11.1 |
| 5-17 | 0.03 (0.03-0.03) | 7.8 (2.0-14.0) | 5.0 | 0.07 (0.00-0.41) | −1.0 (−29.8-39.5)a | 0.0 |
| 18-34 | 0.02 (0.01-0.02) | 16.4 (8.3-25.1) | 14.3 | 0.00 (0.00-0.00) | 0.0 | |
| 35-49 | 0.05 (0.04-0.05) | 4.0 (−0.1-8.3) | 11.1 | 0.07 (0.00-0.41) | 0.0 | |
| 50-64 | 0.10 (0.10-0.11) | 23.4 (19.5-27.3) | 7.9 | 0.07 (0.00-0.41) | 0.0 | |
| ≥65 | 0.14 (0.14-0.15) | 7.9 (5.0-10.9) | 15.1 | 0.15 (0.00-0.85) | 100.0 | |
| Total | 0.10 (0.10-0.10) | 11.1 (9.7-12.6) | 7.8 | 0.68 (0.50-0.89) | 4.9 (−5.0-15.8) | 10.2 |
Abbreviations: CFR, case-fatality ratio; CI, confidence interval.
Note: Incidence presented in cases per 100,000 persons per year.
a
Due to small numbers, age groups were combined. This average annual percent change in incidence is for persons aged ≥5 years in Alaska.