Reducing missed opportunities to vaccinate adults against influenza: what is realistic?

Anticipation of COVID-19 vaccines reduces willingness to socially distance

We investigate how the anticipation of COVID-19 vaccines affects voluntary social distancing. In a large-scale preregistered survey experiment with a representative sample, we study whether providing information about the safety, effectiveness, and availability of COVID-19 vaccines affects the willingness to comply with public health guidelines. We find that vaccine information reduces peoples' voluntary social distancing, adherence to hygiene guidelines, and their willingness to stay at home. Getting positive information on COVID-19 vaccines induces people to believe in a swifter return to normal life. The results indicate an important behavioral drawback of successful vaccine development: An increased focus on vaccines can lower compliance with public health guidelines and accelerate the spread of infectious disease. The results imply that, as vaccinations roll out and the end of a pandemic feels closer, policies aimed at increasing social distancing will be less effective, and stricter policies might be required.

Patterns of recommended vaccine receipt among women ages 24-45 years: a cross-sectional analysis

Background

Vaccine receipt among mid-adults remains low, with only one quarter of adults being up to date for all recommended vaccines. It is important to understand the myriad factors that influence vaccine receipt among mid-adult women to address these low rates.

Methods

We conducted a cross-sectional analysis of data from women ages 24–45 years collected as part of an ongoing case-control study of the effectiveness of HPV vaccine. We examined associations between demographic characteristics and healthcare utilization and receipt of individual vaccines and combinations of multiple vaccines using logistic regression analyses for three routinely recommended vaccines: tetanus, influenza and HPV.

Results

Among the 309 women enrolled in the study, only 19 (6.2%) were up to date for all three recommended vaccines and 41 (13.3%) had not received any of the recommended vaccines. A greater number of health care visits in the past year was associated with receipt of influenza (aOR = 6.37, 95% CI = 2.53, 16.1) and tetanus (aOR = 2.17, 95% CI = 1.14, 4.12) vaccines. White women were more likely to have received HPV vaccine (aOR = 2.39, 95% CI = 1.07, 5.36).

Conclusions

Uptake of recommended vaccines is low among young and mid-adult women. There is a need for greater understanding of the underlying factors influencing vaccine receipt in this population.

RCT of Centralized Vaccine Reminder/Recall for Adults

INTRODUCTION

A proven, but underutilized, method to increase current low vaccination rates is reminder/recall. Centralized reminder/recall using an Immunization Information System reduces the burden of an individual practice conducting reminder/recall. The objectives were to assess the effectiveness of centralized vaccine reminder/recall on improving adult vaccination rates using Colorado's Immunization Information System.

STUDY DESIGN

This study is a pragmatic RCT.

SETTING/PARTICIPANTS

Denver Health patients were divided into three strata: 25,039 individuals aged 19-64 years without a high-risk condition for pneumococcal disease, 16,897 individuals aged 19-64 years with a high-risk condition, and 5,332 individuals aged ≥65 years. Data were collected from October 2015 to April 2016 and analyzed between September 2016 and June 2017.

INTERVENTION

Adults aged 19-64 years without a high-risk condition who needed influenza or tetanus, diphtheria, acellular pertussis vaccine or both, and adults with a high-risk condition and adults aged ≥65 years who needed influenza, or tetanus, diphtheria, acellular pertussis, or pneumococcal vaccine, or all three vaccines were randomized to receive up to three reminder/recalls or usual care.

MAIN OUTCOME MEASURES

Documentation of receipt of any needed vaccine in Immunization Information System ≤6 months after the reminder/recall was the primary outcome. A secondary outcome included implementation costs of the reminder/recall effort. A mixed effects model assessed the association between the intervention and receipt of any needed vaccine while controlling for gender, age, race, ethnicity, insurance type, and history of vaccine refusal.

RESULTS

The intervention was associated with receipt of any needed vaccine in the adults aged ≥65 years population (AOR=1.15, 95% CI=1.02, 1.30), but not the other two populations. Influenza vaccine was the source of this difference, with 32.0% receiving a vaccine in intervention versus 28.6% in usual-care groups (p≤0.01). Start-up and implementation costs per person were $0.86. In the population aged ≥65 years, 29.4 patients would need to be contacted to gain one additional vaccination.

CONCLUSIONS

Centralized reminder/recall was effective at increasing influenza vaccination rates in adults aged ≥65 years over a short time period, without burdening the practices, and at a reasonable cost.

TRIAL REGISTRATION

This study is registered at www.clinicaltrials.gov NCT02133391.

Missed opportunities for improving practice performance in adult immunizations: a meta-narrative review of the literature

BACKGROUND

We sought to characterize how the term "missed opportunities" is reported in the literature in the context of immunization rates and to assess how missed opportunities can be operationalized.

METHODS

Peer-reviewed literature searches were conducted in April - May, 2015, to answer: "What methods research studies used to operationalize missed opportunities to vaccinate?" A meta-narrative review methodology was used.

RESULTS

Seven studies met inclusion criteria. The methodologies for quantifying missed opportunities fell into two general categories based on: 1. the number of healthcare encounters per patient without appropriate vaccination services, defined as a number of visits per patient with no vaccination related services (Missed opportunities per patient); 2. vaccination status as "non-vaccinated" among a group of patients who had a healthcare encounter where the vaccination should/could have had happened (Missed opportunities per population).

CONCLUSIONS

Our study provided an initial overview of the methods reported in the literature, and concluded that the quantifiable missed opportunity holds promise as a measurable outcome (variable) for research and quality improvement projects aimed to increase adult immunization recommendation and uptake in primary care.

Missed Opportunities for Influenza Vaccination Among Hospitalized Children With Influenza at a Tertiary Care Facility

OBJECTIVES

To identify the extent and characteristics of missed opportunities for influenza vaccination among children hospitalized with influenza at a tertiary children's hospital.

METHODS

We conducted a retrospective cohort study of hospitalized patients with polymerase chain reaction-confirmed influenza admitted to Children's Hospital Colorado from 2010 to 2014. We reviewed medical records for vaccination status and previous visits. The primary outcome was the proportion of underimmunized patients hospitalized with influenza with at least 1 missed opportunity visit (visit before influenza diagnosis in which an eligible patient did not receive the influenza vaccine). The relationship between sociodemographic characteristics and the primary outcome were examined using χ(2) tests and nonparametric tests, and variables with P < .2 were entered into a multivariate logistic regression model.

RESULTS

Among 322 patients hospitalized with influenza, 199 (61%) were undervaccinated; 83 of 199 (42%) had at least 1 missed opportunity for influenza vaccination. Multivariate analysis demonstrated that high-risk status (adjusted odds ratio 6.9, 95% confidence interval 3.8-12.4) was associated with increased odds of having a missed opportunity visit. Most missed opportunity visits were to subspecialty clinics (42%), and most visits (71%) occurred from September to November.

CONCLUSIONS

More than 40% of hospitalizations for influenza in children are associated with at least 1 missed opportunity visit at a tertiary center. Our findings highlight the potential role of tertiary care institutions in increasing influenza vaccination rates among children.

Inspecting the Mechanism: A Longitudinal Analysis of Socioeconomic Status Differences in Perceived Influenza Risks, Vaccination Intentions, and Vaccination Behaviors during the 2009-2010 Influenza Pandemic

BACKGROUND

Influenza vaccination is strongly associated with socioeconomic status, but there is only limited evidence on the respective roles of socioeconomic differences in vaccination intentions versus corresponding differences in follow-through on initial vaccination plans for subsequent socioeconomic differences in vaccine uptake.

METHODS

Nonparametric mean smoothing, linear regression, and probit models were used to analyze longitudinal survey data on perceived influenza risks, behavioral vaccination intentions, and vaccination behavior of adults during the 2009-2010 influenza A/H1N1 ("swine flu") pandemic in the United States. Perceived influenza risks and behavioral vaccination intentions were elicited prior to the availability of H1N1 vaccine using a probability scale question format. H1N1 vaccine uptake was assessed at the end of the pandemic.

RESULTS

Education, income, and health insurance coverage displayed positive associations with behavioral intentions to get vaccinated for pandemic influenza while employment was negatively associated with stated H1N1 vaccination intentions. Education and health insurance coverage also displayed significant positive associations with pandemic vaccine uptake. Moreover, behavioral vaccination intentions showed a strong and statistically significant positive partial association with later H1N1 vaccination. Incorporating vaccination intentions in a statistical model for H1N1 vaccine uptake further highlighted higher levels of follow-through on initial vaccination plans among persons with higher education levels and health insurance.

LIMITATIONS

Sampling bias, misreporting in self-reported data, and limited generalizability to nonpandemic influenza are potential limitations of the analysis.

CONCLUSIONS

Closing the socioeconomic gap in influenza vaccination requires multipronged strategies that not only increase vaccination intentions by improving knowledge, attitudes, and beliefs but also facilitate follow-through on initial vaccination plans by improving behavioral control and access to vaccination for individuals with low education, employed persons, and the uninsured.

Can routine offering of influenza vaccination in office-based settings reduce racial and ethnic disparities in adult influenza vaccination?

BACKGROUND

Influenza vaccination remains below the federally targeted levels outlined in Healthy People 2020. Compared to non-Hispanic whites, racial and ethnic minorities are less likely to be vaccinated for influenza, despite being at increased risk for influenza-related complications and death. Also, vaccinated minorities are more likely to receive influenza vaccinations in office-based settings and less likely to use non-medical vaccination locations compared to non-Hispanic white vaccine users.

OBJECTIVE

To assess the number of "missed opportunities" for influenza vaccination in office-based settings by race and ethnicity and the magnitude of potential vaccine uptake and reductions in racial and ethnic disparities in influenza vaccination if these "missed opportunities" were eliminated.

DESIGN

National cross-sectional Internet survey administered between March 4 and March 14, 2010 in the United States.

PARTICIPANTS

Non-Hispanic black, Hispanic and non-Hispanic white adults living in the United States (N = 3,418).

MAIN MEASURES

We collected data on influenza vaccination, frequency and timing of healthcare visits, and self-reported compliance with a potential provider recommendation for vaccination during the 2009-2010 influenza season. "Missed opportunities" for seasonal influenza vaccination in office-based settings were defined as the number of unvaccinated respondents who reported at least one healthcare visit in the Fall and Winter of 2009-2010 and indicated their willingness to get vaccinated if a healthcare provider strongly recommended it. "Potential vaccine uptake" was defined as the sum of actual vaccine uptake and "missed opportunities."

KEY RESULTS

The frequency of "missed opportunities" for influenza vaccination in office-based settings was significantly higher among racial and ethnic minorities than non-Hispanic whites. Eliminating these "missed opportunities" could have cut racial and ethnic disparities in influenza vaccination by roughly one half.

CONCLUSIONS

Improved office-based practices regarding influenza vaccination could significantly impact Healthy People 2020 goals by increasing influenza vaccine uptake and reducing corresponding racial and ethnic disparities.

Who knew? Awareness of being recommended for influenza vaccination among U.S. adults

BACKGROUND

Starting with the 2010-2011 influenza season, the Advisory Committee on Immunization Practices at the U.S. Centers for Disease Control and Prevention recommends annual influenza vaccination to all people aged 6 months and older unless contraindicated.

OBJECTIVES

To measure perceived influenza vaccination recommendation status among US adults (n = 2122) and its association with socio-demographic characteristics and recommendation status during the 2009-2010 pandemic influenza season.

METHODS

We analyze nationally representative data from longitudinal Internet surveys of U.S. adults conducted in November-December 2009 and September-October 2010.

RESULTS

During the 2010-2011 vaccination season, 46.2 percent (95%--CI: 43.3-49.1%) of U.S. adults correctly reported to be covered by a government recommendation for influenza vaccination. Awareness of being covered by a government influenza vaccination recommendation was statistically significantly higher among non-working adults and adults who had been recommended for seasonal vaccination or both seasonal and H1N1 vaccination during the 2009-2010 pandemic influenza vaccination season.

CONCLUSION

Our results highlight that a majority of U.S. adults do not know that they are recommended for annual influenza vaccination by the government. The fraction of adults who are unaware of their recommendation status is especially large among newly recommended healthy young adults. The universal vaccination recommendations will only be successful if they reach both patients and physicians and lead to changing vaccination practices. The universal nature of the new recommendation simplifies vaccination-related outreach and compliance with government vaccination guidelines considerably, as it does not require any identification of specific recommendation groups based on complex personal or health risk factors.

The growth of retail clinics in vaccination delivery in the U.S

BACKGROUND

Retail clinics are a promising venue in which to promote and administer vaccinations; however, little is known about who receives vaccinations at a retail clinic.

PURPOSE

The aim of this paper was to describe the use of retail clinics in the delivery of recommended vaccinations.

METHODS

The three largest retail clinic operators in the U.S.--MinuteClinic, TakeCare, and LittleClinic--provided de-identified clinic data for 2007-2009. Descriptive statistics were generated in 2011 on visit type, type of vaccination, patient age, and payment method.

RESULTS

From 2007 to 2009, there were 8.9 million retail clinic visits across the three largest clinic operators. In 2009, vaccinations were administered at 1,952,610 visits, up from 469,330 visits in 2007. Visits in which vaccinations were administered accounted for 39.9%, 36.4%, and 42.0% of total visits in 2007, 2008, and 2009, respectively. In 2009, 1.8 million influenza vaccinations (including seasonal and H1N1 vaccinations) were administered by the two largest retail clinic operators (94% of all vaccination visits). Pneumococcal vaccination was administered at 59,849 visits (3% of all vaccination visits). In 2009, vaccinations were also administered in 0.8% of acute care visits (n=18,807); 0.8% of chronic care visits (n=261); and 1.3% of general medical exams (n=2497).

CONCLUSIONS

Results suggest that retail clinics play a growing role in vaccination delivery, and vaccinations constitute a substantial share of the business conducted by retail clinics. As such, retail clinics have the potential to play an important role in vaccination delivery in the U.S. Retail clinics potentially could deliver more vaccinations if they reviewed vaccination histories and counseled patients regarding the benefits of vaccination during acute care visits.

Improving adult immunization practices using a team approach in the primary care setting

OBJECTIVES

The objective of this study was to improve the immunization rates of primary care practices using a team approach.

METHODS

Practices performed 35 random chart abstractions at 2 time points and completed a survey about immunizations at baseline and 12 months after intervention. Data were collected for the following immunizations: influenza, pneumococcal, tetanus diphtheria (Td)/tetanus diphtheria pertussis (Tdap), hepatitis A, hepatitis B, meningococcal, varicella, herpes zoster, and human papilloma virus. Between baseline and after intervention, practice teams were given feedback reports and access to an online educational tool, and attended quality improvement coaching conference calls.

RESULTS

Statistically significant improvements were seen for Td/Tdap (45.6% pre-intervention, 55.0% post-intervention; P  ≤ .01), herpes zoster (12.3% pre-intervention, 19.3% post-intervention; P ≤ .01), and pneumococcal (52.2% pre-intervention, 74.5% post-intervention; P ≤ .01) immunizations. Data also revealed an increase in the number of physicians who discussed herpes zoster and pneumococcal vaccinations with their patients (23.2% pre-intervention, 43.3% post-intervention; P ≤ .01 and 19.9% pre-intervention, 43.0% post-intervention; P ≤ .01, respectively) as well as an increase in physicians using the Centers for Disease Control and Prevention immunization schedule (52.9% pre-intervention, 88.2% post-intervention; P ≤ .02).

CONCLUSIONS

The immunization rates of the primary care practices involved in this study improved.

Contact and communication with healthcare providers regarding influenza vaccination during the 2009-2010 H1N1 pandemic

OBJECTIVE

The existence of two vaccines-seasonal and pandemic-created the potential for confusion and misinformation among consumers during the 2009-2010 vaccination season. We measured the frequency and nature of influenza vaccination communication between healthcare providers and adults for both seasonal and 2009 influenza A(H1N1) vaccination and quantified its association with uptake of the two vaccines.

METHODS

We analyzed data from 4040 U.S. adult members of a nationally representative online panel surveyed between March 4th and March 24th, 2010. We estimated prevalence rates and adjusted associations between vaccine uptake and vaccination-related communication between patients and healthcare providers using bivariate probit models.

RESULTS

64.1% (95%-CI: 61.5%-66.6%) of adults did not receive any provider-issued influenza vaccination recommendation. Adults who received a provider-issued vaccination recommendation were 14.1 (95%-CI: -2.4 to 30.6) to 32.1 (95%-CI: 24.3-39.8) percentage points more likely to be vaccinated for influenza than adults without a provider recommendation, after adjusting for other characteristics associated with vaccination.

CONCLUSIONS

Influenza vaccination communication between healthcare providers and adults was relatively uncommon during the 2009-2010 pandemic. Increased communication could significantly enhance influenza vaccination rates.