© 2006 American Public Health Association DOI: 10.2105/AJPH.2004.049882
The authors are with the Whiteriver Service Unit, Indian Health Service, Whiteriver, Ariz. Correspondence: Requests for reprints should be sent to Marc Traeger, MD, Whiteriver Service Unit, Indian Health Service, PO Box 860, Whiteriver, AZ 85941 (e-mail: marc.traeger{at}mail.ihs.gov).
Objectives. The Whiteriver Service Unit (WRSU) used proven effective methods to conduct an influenza vaccination campaign during the 20022003 influenza season to bridge the vaccination gap between American Indians and Alaska Natives and the US population as a whole. Methods. In our vaccination program, we used a multidisciplinary approach that included staff and community education, standing orders, vaccination of hospitalized patients, and employee, outpatient, community, and home vaccinations without financial barriers. Results. WRSU influenza vaccination coverage rates among persons aged 65 years and older, those aged 50 to 64 years, and those with diabetes were 71.8%, 49.6%, and 70.2%, respectively, during the 20022003 influenza season. We administered most vaccinations to persons aged 65 years and older through the outpatient clinics (63.6%) and public health nurses (30.0%). The WRSU employee influenza vaccination rate was 72.8%. Conclusions. We achieved influenza vaccination rates in targeted groups of an American Indian population that are comparable to or higher than rates in other US populations. Our system may be a useful model for other facilities attempting to bridge disparity for influenza vaccination.
Influenza accounted for approximately 36 000 deaths annually in the United States during 19901999.1 Only Streptococcus pneumoniae resulted in more vaccine-preventable deaths.2 Death rates for pneumonia and influenza in American Indians/Alaskan Natives of all ages were 70% greater than the overall US rate of 12.9 per 100 000 population during 1997,3 and American Indians/Alaskan Natives aged 65 years and older were 20% more likely to die of pneumonia and influenza than the US population as a whole during 19921994.4 Diabetes has a substantial impact on deaths associated with pneumonia and influenza,5 and American Indian/Alaskan Native (AIAN) adults have an age-specific prevalence of diabetes 2 to 3 times higher than that for US adults as a whole.6 American Indians/Alaskan Natives have lower education and income levels than the US population as a whole,7 characteristics associated with lower rates of influenza vaccination.8,9 Other disparities of health indicators between American Indians/Alaskan Natives and other racial/ethnic groups have been documented in recent years.7,10 The Healthy People 2000 goal for influenza vaccination coverage among noninstitutionalized persons aged 65 years and older was 60%,11(p287) and the goal was increased to 90% in Healthy People 2010.12 Influenza vaccination coverage among American Indians/Alaskan Natives aged 65 years and older was 51.2% during the 20022003 influenza season according to a nationwide Indian Health Service (IHS) performance evaluation assessment.13 In comparison, the median percentage of adults reporting receipt of influenza vaccine in 2002 was 68.4% (range 32.2% to 76.6%) among persons aged 65 years and older in 50 states, the District of Columbia, and 3 US territories14 determined through Behavioral Risk Factor Surveillance System analysis. Other target groups of persons who are at increased risk for complications from influenza have been identified,15(pp78) but vaccination rates among American Indians/Alaskan Natives in most target groups have not been well established. Behavioral Risk Factor Surveillance System analyses indicate a median influenza vaccination rate among persons aged 50 to 64 years in US states/areas of 38.4% (range 15.9% to 49.0%). Vaccination rates among persons with diabetes were reported at 51.5% and 72.6% in persons aged 50 to 64 years and aged 65 years and older, respectively.14 Eliminating racial and ethnic health disparities, including disparities in vaccination coverage, is an overarching goal of Healthy People 2010.12 The Whiteriver Service Unit (WRSU) has met this goal for influenza vaccination coverage for adults older than 50 years and in persons with diabetes. We describe the influenza vaccination program used to eliminate this disparity in this American Indian community.
Health Facility and Service Population The Whiteriver Service Unit (WRSU) is a rural, 25-bed IHS hospital and outpatient facilities complex on the White Mountain Apache Tribe reservation in eastern Arizona, with a user population of more than 15000 persons. Health services are provided to American Indians/Alaskan Natives through IHS at no charge. The hospital provides adult and pediatric inpatient care, a birthing center and obstetric services, ambulatory surgery, and multiple support services. Outpatient services include a hospital-based clinic and urgent care facility, an emergency department, a satellite clinic, and dental, optometry, physical therapy, pharmacy, and other support services. The primary care staff at WRSU includes 18 physicians and 5 nurse practitioners, representing 20 full-time-equivalent providers. Ten public health nurses provide public health support and services in the community. There are approximately 1700 WRSU hospital admissions, 950 transfers to other facilities, and 140000 ambulatory visits at WRSU annually. More than 96% of ambulatory visits are from Apache, Navajo, or Hopi tribal members.
Analysis, Data, and Definitions The data are assembled through a query of WRSU provider visits using the Resource and Patient Management System. This is an noncommercially available IHS software package (Office of Information Technology, Indian Health Service, Albuquerque, NM) used to compile the WRSU patient registry and electronically record information from patients medical records after every patient encounter. The Resource and Patient Management System also produces an updated individualized health summary for medical records with provider prompts to immunize persons who lack influenza or other recommended vaccinations. GPRA analyses used Resource and Patient Management System queries for all indicators. Influenza vaccination indicator analysis used 3 population definitions. For WRSU, these were as follows: GPRA user population, defined as American Indians/Alaskan Natives alive throughout the evaluation period residing in a community within the WRSU "catchment area" (which includes the 2500square mile reservation and nonreservation communities up to 75 miles from the hospital) who had a WRSU visit during the period from the 3 years before to the end of the report period. GPRA active clinical population, defined as persons who met the criteria for the GPRA user population and had 2 visits to medical clinics in the 3 years before the end of the report period. GPRA active diabetic population, defined as persons among the active clinical population who had a diabetes diagnosis confirmed at least 1 year before the report period and had at least 2 WRSU visits in the past year and 2 diabetes-related visits ever. Groups analyzed by the GPRA influenza vaccination indicator included persons within the GPRA active diabetic population and persons aged 65 years and older and 50 to 64 years within the GPRA user and active clinical populations. Those with a documented influenza vaccination during the year before the end of the report period were identified as vaccinated against influenza, and because GPRA was tracking persons offered vaccine, refusals were categorized as vaccinated. All others were considered unvaccinated. Persons with egg allergy (a contraindication to influenza vaccination) were excluded from immunization to influenza analysis. GPRA analyses of health indicators were performed using data from up to 594 health care facilities throughout the Indian health delivery network, although not all facilities participated in each health indicator analysis. We used the report period July 1, 2002, through June 30, 2003. We used GPRA user population groups to characterize the WRSU vaccination delivery method and to compare WRSU rates to those of US states and territories because the user population may reflect the actual residential population more closely than the active clinical population. Because the national IHS coverage rates are reported among active clinical population groups, we used the WRSU active clinical population groups to compare WRSU rates to IHS aggregate rates. We performed GPRA population electronic queries and manual chart reviews to determine the vaccine delivery mechanism (administration through outpatient clinics and emergency departments, inpatient vaccinations, public health nursing community sites, employee health services, or outside facilities) and the number of refusals. Manual chart reviews were also used to adjust for inaccurate or incomplete electronic information. The WRSU employee vaccination rate, provided by the infection control officer, included all employees and was not limited to American Indians/Alaskan Natives.
Vaccination Campaign
Health Staff and Public Information We provided public information through radio broadcasts and brochures. When the vaccine arrived, we broadcast information on the tribal radio station about vaccine availability, groups at increased risk for influenza complications, and recommendations and mechanisms for acquiring vaccination. The information was translated and announced in the Apache language during the broadcast. A vaccine information statement16 was provided to all persons interested in vaccination, and translation or further explanation was available on request. Public health nurses provided the same information to school administrators and to community members during home visits and community health classes (e.g., childbirth and parenting classes), a tribal elder conference, and health screening clinics. Outpatient clinical staff and public health nurses also provided information during individual visits or telephone calls.
Vaccination Public health nurses provided influenza vaccinations in the community. Before the vaccination campaign, public health nurses queried the WRSU registry to identify patients in target groups within public health nurse coverage areas. Public health nurses provided home visits and vaccinations, and vaccination information and instructions were left for targeted individuals if they were not home. When time and workload constraints precluded contact with all targeted persons during home and community vaccinations, priority was given to persons aged 65 years and older and those with diabetes. Public health nurses provided influenza vaccinations at 1 communitys elder conference, at 3 locations during a November White Mountain Apache Tribe employee health fair, and in community clinics at 14 other reservation locations including group homes, day care centers, an elderly meal site, tribal businesses, and the jail. Public health nurses coordinated efforts with other departments by documenting vaccination or referral for vaccination in patients medical record and through direct communication with departments when patients were admitted to outpatient or inpatient departments. Vaccinations were documented electronically, and this automatically updated health summaries so that a patients vaccination status was subsequently available throughout the service unit.
Recent Changes in the Influenza Vaccination Campaign
GPRA User Population and Persons With Diabetes The WRSU influenza vaccination coverage rate was 71.8% among persons aged 65 years and older in the GPRA user population during the 20022003 influenza season (Table 1
Indian Health Service Vaccination Rate Comparison WRSU GPRA active clinical population analysis revealed that 355 of 484 (73.3%) persons aged 65 years and older were vaccinated against influenza, compared with 21578 of 42110 (51.2%) vaccinated among IHS facilities nationwide (risk ratio for WRSU vaccination = 2.18; 95% confidence interval [CI] = 2.06, 2.30, P < .0001). Vaccination coverage rates for aggregate national IHS rates were not available for the GPRA user population.
Health Care Workers
We achieved influenza vaccination rates in targeted groups of an American Indian population and among WRSU health care workers that are comparable to or higher than rates in other US populations. We attribute these accomplishments to the multidisciplinary approach used in our vaccination program that includes staff and community education, standing orders, vaccination of employees and hospitalized patients, and community and home vaccinations without financial barriers. We exceeded the Healthy People 2000 goal of a 60% influenza vaccination rate among those aged 65 years and older in our community and met the overarching Healthy People 2010 goal of eliminating the health disparity for influenza vaccination in this American Indian population.
Public Health Nursing
Standing Orders
Health Care Worker Vaccination
Vaccination Rates Among American Indians/Alaskan Natives
Limitations
Refusals
Conclusions
This work was presented at The Commissioned Officers Association Public Health Professional Conference, May 18, 2004, Anchorage, Alaska. We thank Linza Bethea, Theresa Cullen, and Tammy Kuusisto for their analysis and data abstraction support, and the WRSU staff for their substantial contributions to this study.
Human Participant Protection
Peer Reviewed Note. The opinions expressed in this paper are those of the authors and do not necessarily reflect the views of the Indian Health Service.
Contributors Accepted for publication March 3, 2005.
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