Helen Ding

Influenza Vaccination Coverage Among Pregnant Women--United States, 2014-15 Influenza Season.

Pregnant women and their infants are at increased risk for severe influenza-associated illness (1), and since 2004, the Advisory Committee on Immunization Practices (ACIP) has recommended influenza vaccination for all women who are or might be pregnant during the influenza season, regardless of the trimester of the pregnancy (2). To assess influenza vaccination coverage among pregnant women during the 2016-17 influenza season, CDC analyzed data from an Internet panel survey conducted during March 28-April 7, 2017. Among 1,893 survey respondents pregnant at any time during October 2016-January 2017, 53.6% reported having received influenza vaccination before (16.2%) or during (37.4%) pregnancy, similar to coverage during the preceding four influenza seasons. Also similar to the preceding influenza season, 67.3% of women reported receiving a provider offer for influenza vaccination, 11.9% reported receiving a recommendation but no offer, and 20.7% reported receiving no recommendation; among these women, reported influenza vaccination coverage was 70.5%, 43.7%, and 14.8%, respectively. Among women who received a provider offer for vaccination, vaccination coverage differed by race/ethnicity, education, insurance type, and other sociodemographic factors. Use of evidence-based practices such as provider reminders and standing orders could reduce missed opportunities for vaccination and increase vaccination coverage among pregnant women.

Adverse events following administration to pregnant women of influenza A (H1N1) 2009 monovalent vaccine reported to the Vaccine Adverse Event Reporting System

OBJECTIVE The objective of the study was to evaluate and summarize reports to the Vaccine Adverse Event Reporting System (VAERS), a spontaneous reporting system, in pregnant women who received influenza A (H1N1) 2009 monovalent vaccine to assess for potential vaccine safety problems. STUDY DESIGN We reviewed reports of adverse events (AEs) in pregnant women who received 2009-H1N1 vaccines from Oct. 1, 2009, through Feb. 28, 2010. RESULTS VAERS received 294 reports of AEs in pregnant women who received 2009-H1N1 vaccine: 288 after inactivated and 6 after the live attenuated vaccines. Two maternal deaths were reported. Fifty-nine women (20.1%) were hospitalized. We verified 131 pregnancy-specific outcomes: 95 spontaneous abortions (<20 weeks); 18 stillbirths (≥20 weeks); 7 preterm deliveries (<37 weeks); 3 threatened abortions; 2 preterm labor; 2 preeclampsia; and 1 each of fetal hydronephrosis, fetal tachycardia, intrauterine growth retardation, and cleft lip. CONCLUSION Review of reports to VAERS following H1N1 vaccination in pregnant women did not identify any concerning patterns of maternal or fetal outcomes.

Influenza vaccination coverage among pregnant women–National 2009 H1N1 Flu Survey (NHFS)

We sought to describe vaccination with influenza A (H1N1) 2009 monovalent (2009 H1N1) and trivalent seasonal (seasonal) vaccines among pregnant women during the 2009 through 2010 influenza season. A national H1N1 flu survey was conducted April through June 2010. The 2009 H1N1 and seasonal vaccination coverage estimates were 45.7% and 32.1%, respectively, among pregnant women aged 18-49 years. Receipt of a health care providers recommendation for vaccination, perceived effectiveness of influenza vaccinations, and perceived high chance of influenza infection were independently associated with higher 2009 H1N1 and seasonal vaccination coverage. Pregnancy during October 2009 through January 2010 was independently associated with higher 2009 H1N1 vaccination coverage. The 2009 H1N1 vaccination level among pregnant women was higher than the seasonal vaccination level during the 2009 through 2010 season; it was also higher than vaccination among nonpregnant women with and without high-risk conditions. Health care providers and public health messaging played important roles in influencing vaccination behavior.

Monitoring seasonal influenza vaccination coverage among pregnant women in the United States.

This report describes surveillance systems used for assessing influenza vaccination coverage among pregnant women in the United States. Coverage estimates and factors associated with maternal vaccination are reviewed for internet panel surveys of pregnant women and the Pregnancy Risk Assessment Monitoring System (PRAMS); new estimates are reported from the Behavioral Risk Factor Surveillance System (BRFSS) and Internet panel surveys. Influenza vaccination coverage among pregnant women improved from 11% during the 2001-2002 influenza season to approximately 38% measured by BRFSS and 50% measured by Internet panel surveys during the 2010-2011 influenza season. Coverage varied by state, ranging from 26% to 68% among the states participating in PRAMS in 2009-2010. Provider recommendation increased a womans likelihood of vaccination nearly 6-fold. Despite increases in influenza vaccination coverage among pregnant women, approximately half remain unvaccinated. Continued efforts are needed to ensure pregnant women receive recommendations and offers of vaccination from their health care providers.

Trends in racial/ethnic disparities in influenza vaccination coverage among adults during the 2007-08 through 2011-12 seasons.

BACKGROUND Annual influenza vaccination is recommended for all persons aged ≥6 months. The objective of this study was to assess trends in racial/ethnic disparities in influenza vaccination coverage among adults in the United States. METHODS We analyzed data from the 2007-2012 National Health Interview Survey (NHIS) and Behavioral Risk Factor Surveillance System (BRFSS) using Kaplan-Meier survival analysis to assess influenza vaccination coverage by age, presence of medical conditions, and racial/ethnic groups during the 2007-08 through 2011-12 seasons. RESULTS During the 2011-12 season, influenza vaccination coverage was significantly lower among non-Hispanic blacks and Hispanics compared with non-Hispanic whites among most of the adult subgroups, with smaller disparities observed for adults age 18-49 years compared with other age groups. Vaccination coverage for non-Hispanic white, non-Hispanic black, and Hispanic adults increased significantly from the 2007-08 through the 2011-12 season for most of the adult subgroups based on the NHIS (test for trend, P < .05). Coverage gaps between racial/ethnic minorities and non-Hispanic whites persisted at similar levels from the 2007-08 through the 2011-12 seasons, with similar results from the NHIS and BRFSS. CONCLUSIONS Influenza vaccination coverage among most racial/ethnic groups increased from the 2007-08 through the 2011-12 seasons, but substantial racial and ethnic disparities remained in most age groups. Targeted efforts are needed to improve coverage and reduce these disparities.

National and state-specific estimates of place of influenza vaccination among adult populations – United States, 2011–12 influenza season

BACKGROUND Annual influenza vaccination has been recommended for all persons ≥6 months since the 2010-11 season. New partnerships between public health agencies and medical and nonmedical vaccination providers have increased the number of vaccination providers and locations where vaccination services are delivered. METHODS Data from the 2011-12 Behavioral Risk Factor Surveillance System (BRFSS) were analyzed. Point estimates of place of vaccination and 95% confidence intervals were calculated. Multivariable logistic regression and predictive marginal modeling were conducted to identify factors associated with vaccination settings. RESULTS Among adults vaccinated during the 2011-12 influenza season, a doctors office was the most common place (38.4%) for receipt of influenza vaccination, with stores (e.g., supermarkets or drug stores) (20.1%) the next common, and workplaces (17.6%) the third common. Overall, reported vaccination in nonmedical settings by state ranged from 32.2% in California to 60.4% in Nevada, with a median of 45.8%. Characteristics significantly associated with an increased likelihood of receipt of vaccination in nonmedical settings were higher education, not having certain identified high-risk conditions, not having had a routine checkup in the previous 12 months, and not having a primary doctor for health care. Being a member of a racial/ethnic minority group, unemployed or not in the work force were significantly associated with a decreased likelihood of receipt of vaccination in nonmedical settings. CONCLUSION Doctors offices were the most common medical setting for adult influenza vaccination; workplaces and stores were important nonmedical settings. Increasing access to vaccination services in medical and nonmedical settings should be considered as important strategies for improving vaccination coverage. These results also can help guide development of strategies for achieving Healthy People 2020 objectives for influenza vaccination of adult populations.

Uptake of Influenza Vaccination and Missed Opportunities Among Adults with High-Risk Conditions, United States, 2013

BACKGROUND Since 1960, the Advisory Committee on Immunization Practices has recommended influenza vaccination for adults with certain high-risk conditions because of increased risk for complications from influenza infection. We assessed national influenza vaccination among persons ages 18-64 years with high-risk conditions. METHODS We analyzed data from the 2012 and 2013 National Health Interview Survey. The Kaplan-Meier survival analysis procedure was used to estimate the cumulative proportion of influenza vaccination among adults ages 18-64 years with high-risk conditions. Potential missed opportunities for influenza vaccination were also evaluated. Multivariable logistic regression and predictive marginal analyses were conducted to identify factors independently associated with vaccination. RESULTS Overall, 39.9 million adults ages 18-64 years (18.9%) had at least one high-risk condition. For adults ages 18-64 years with high-risk conditions, overall influenza vaccination coverage was 49.5%. Coverage among adults 50-64 years of age was significantly higher compared with those ages 18-49 years (59.3% vs 39.0%; P <.05). Among adults ages 18-64 years, coverage was 46.2% for those with chronic lung diseases, 50.5% for those with heart disease, 58.0% for those with diabetes, 62.5% for those with renal disease, and 56.4% for those with cancer. Overall, 90.1% reported at least one visit to a health care setting where vaccination could have been provided. Among adults ages 18-64 years with high-risk conditions, older age, being female, Hispanic ethnicity or Asian race, having one or more physician visits, a regular physician for health care, health insurance, and having ever received pneumococcal vaccination were independently associated with a higher likelihood of influenza vaccination. Being widowed/divorced/separated or never married and not being employed were independently associated with a lower likelihood of influenza vaccination. CONCLUSIONS Influenza vaccination coverage varies substantially by age and high-risk conditions but remains low. Approximately 50% of those with high-risk conditions remain unvaccinated. Health care providers should ensure they routinely assess influenza vaccination status, and recommend and offer vaccines to those with high-risk conditions.

H1N1 and seasonal influenza vaccination of U.S. healthcare personnel, 2010.

Background Seasonal influenza vaccination routinely has been recommended for healthcare personnel (HCP) since 1984. The influenza A (H1N1) 2009 monovalent vaccine (H1N1 vaccine) became available in the U.S. in October 2009. Purpose To assess 2009 H1N1 and seasonal influenza vaccination coverage and identify factors independently associated with vaccination among HCP in the U.S. Methods Data from the 2009–2010 Behavioral Risk Factor Surveillance System (BRFSS) influenza supplemental survey were analyzed in 2011. Multivariable logistic regression and predictive marginal models were performed to identify factors independently associated with vaccination among HCP. The Kaplan-Meier survival analysis procedure was used to estimate the cumulative proportion of people vaccinated. Results Among 16,975 HCP surveyed, 2009 H1N1, seasonal, and any-dose vaccination coverage were 34.1% (95% CI=32.7%, 35.5%); 52.4% (95% CI=50.9%, 53.9%); and 58.0% (95% CI=56.5%, 59.5%), respectively, all of which were significantly higher than those for non-HCP (19.1%, 34.9%, and 40.3%, respectively). The H1N1 vaccination coverage among HCP ranged from 18.4% in Mississippi to 56.1% in Massachusetts and seasonal influenza vaccination coverage ranged from 40.4% in Florida to 73.1% in Nebraska. Characteristics independently associated with an increased likelihood of 2009 H1N1, seasonal, and any-dose vaccinations among HCP were as follows: non-Hispanic white, higher income, having a high-risk condition, having health insurance, the ability to see a doctor if needed, and having had a routine checkup in the previous year. Conclusions Vaccination coverage was higher among HCP than non-HCP but still below the national health objective of 90%. Knowledge of national and state-specific H1N1 and seasonal vaccination coverage among HCP is useful for evaluating the vaccination campaign and implementing strategies for increasing yearly seasonal vaccination coverage and improving vaccination coverage among HCP in possible future pandemics.

Influenza A (H1N1) 2009 Monovalent Vaccination Among Adults with Asthma, U.S., 2010

BACKGROUND The 2009 pandemic influenza A (H1N1) virus (2009 H1N1) was first identified in April 2009 and quickly spread around the world. The first doses of influenza A (H1N1) 2009 monovalent vaccine (2009 H1N1 vaccine) became available in the U.S. in early October 2009. Because people with asthma are at increased risk of complications from influenza, people with asthma were included among the initial prioritized groups. PURPOSE To evaluate 2009 H1N1 vaccination coverage and identify factors independently associated with vaccination among adults with asthma in the U.S. METHODS Data from the 2009-2010 BRFSS (Behavioral Risk Factor Surveillance System) influenza supplemental survey were used; responses from March through June 2010 were analyzed to estimate vaccination levels of 2009 H1N1 vaccine among respondents aged 25-64 years with asthma. Multivariable logistic regression and predictive marginal models were performed to identify factors independently associated with vaccination. RESULTS Among adults aged 25-64 years with asthma, 25.5% (95% CI=23.9%, 27.2%) received the 2009 H1N1 vaccination. Vaccination coverage ranged from 9.9% (95% CI=6.4%, 15.1%) in Mississippi to 46.1% (95% CI=33.3%, 61.2%) in Maine. Characteristics independently associated with an increased likelihood of vaccination among adults with asthma were as follows: had a primary doctor, had other high-risk conditions, and received seasonal influenza vaccination in the 2009-2010 season. CONCLUSIONS Vaccination coverage among adults aged 25-64 years with asthma was only 25.5% and varied widely by state and demographic characteristics. National and state-specific 2009 H1N1 vaccination coverage data for adults with asthma are useful for evaluating the vaccination campaign and for planning and implementing strategies for increasing vaccination coverage in possible future pandemics.

National and State-Specific Td and Tdap Vaccination of Adult Populations.

INTRODUCTION The Advisory Committee on Immunization Practices recommends a single dose of tetanus, diphtheria, and acellular pertussis vaccine (Tdap) for adults followed by tetanus and diphtheria toxoids (Td) booster doses every 10 years thereafter. This study assessed recent Td and Tdap vaccination among adult populations. METHODS The 2013 Behavioral Risk Factor Surveillance System data were analyzed in 2015 to assess Td and Tdap vaccination coverage among adults at national and state levels. Multivariable logistic regression and predictive marginal models were performed to identify factors independently associated with vaccination. RESULTS Overall, national vaccination coverage among adults aged ≥18 years for Td was 57.5% and for Tdap was 28.9%. Among states, Td vaccination coverage ranged from 47.8% in Nevada to 73.1% in Minnesota, and Tdap coverage ranged from 17.7% in Mississippi to 47.6% in Minnesota. Characteristics independently associated with an increased likelihood of Tdap vaccination among adults aged ≥18 years were younger age; being female; American Indian/Alaska Native race; being never married; higher education; not being in the workforce; reporting a household income ≥