Alaska Invasive Bacterial Disease Surveillance Report Haemophilus influenzae – 2015
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Background
AIP has conducted statewide surveillance of invasive Haemophilus influenzae since 1980. Invasive H. influenzae is a reportable condition to the State of Alaska Division of Public Health (DPH). Reports of cases of disease caused by this organism are shared between AIP and DPH.
Population
The population of the State of Alaska in 2015 was 737,625; 144,274 (19%) were Alaska Native people. Source: AK Dept. of Labor & Workforce Development population estimates.
Case Definition
An isolate of Haemophilus influenzae from a normally sterile site that has been taken from a resident of Alaska.
Methods
Participating laboratories send isolates recovered from sterile sites to the AIP laboratory in Anchorage; materials and forms for isolate shipment and data collection are provided to each laboratory by AIP. Demographic and clinical information on the cases are collected from a review of medical records. Annually, AIP asks that each laboratory review their records and provide information on any cases that may have been overlooked.
| Race | Cases n (%) |
Age Adjusted Rate* | % Male | Deaths n (%) |
|---|---|---|---|---|
| Alaska Native | 10 (45) | 6.2 | 70% | 0 (0) |
| Non-Native | 12 (55) | 1.7 | 25% | 0 (0) |
| Total | 22 | 45% | 0 (0) |
*Cases per 100,000 per percent distribution of Alaska 2010 population
| Alaska Native | Non-Native | |||
|---|---|---|---|---|
| Age (years) | No. Cases | Rate* | No. Cases | Rate* |
| <2 | 4 | 71.9 | 0 | 0 |
| 2-4 | 3 | 32.6 | 0 | 0 |
| 5-18 | 0 | 0 | 1 | 0.9 |
| 19-54 | 2 | 3 | 3 | 1 |
| 55-64 | 1 | 7.3 | 2 | 2.4 |
| 65+ | 0 | 0 | 6 | 9.3 |
| Total | 10 | 6.9 | 12 | 2 |
*Cases per 100,000 population
| No. | %* | |
|---|---|---|
| Pneumonia with bacteremia | 12 | 55 |
| Bacteremia | 2 | 9 |
| Meningitis | 2 | 9 |
| Septic arthritis | 2 | 9 |
| Other | 4 | 20 |
*Percent of cases
| Race | Age (yrs) | a | b | f | NT* |
|---|---|---|---|---|---|
| AK Native | <2 | 3 | 0 | 0 | 1 |
| 2-18 | 2 | 1 | 0 | 0 | |
| 19-64 | 1 | 0 | 0 | 2 | |
| 65+ | 0 | 0 | 0 | 0 | |
| Non-Native | <2 | 0 | 0 | 0 | 0 |
| 2-18 | 0 | 0 | 0 | 1 | |
| 19-64 | 0 | 0 | 0 | 4 | |
| 65+ | 0 | 0 | 0 | 5 |
*Non-typeable
Vaccine Preventable Disease
In recent years, the prevalence of H. influenzae type b (Hib) has declined due to use of a childhood vaccine against this serotype. There was one case of Hib in a child less than 5 years old in 2015; the child was fully vaccinated.