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Michels SY, Daley MF, Newcomer SR. Completion of multidose vaccine series in early childhood: current challenges and opportunities. Curr Opin Infect Dis 2024; 37:176-184. [PMID: 38427536 PMCID: PMC11210715 DOI: 10.1097/qco.0000000000001007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2024]
Abstract
PURPOSE OF REVIEW Completion of all doses in multidose vaccine series provides optimal protection against preventable infectious diseases. In this review, we describe clinical and public health implications of multidose vaccine series noncompletion, including current challenges to ensuring children receive all recommended vaccinations. We then highlight actionable steps toward achieving early childhood immunization goals. RECENT FINDINGS Although coverage levels are high for most early childhood vaccinations, rates of completion are lower for vaccinations that require multiple doses. Recent research has shown that lower family socioeconomic status, a lack of health insurance coverage, having multiple children in the household, and moving across state lines are associated with children failing to complete multidose vaccine series. These findings provide contextual evidence to support that practical challenges to accessing immunization services are impediments to completion of multidose series. Strategies, including reminder/recall, use of centralized immunization information systems, and clinician prompts, have been shown to increase immunization rates. Re-investing in these effective interventions and modernizing the public health infrastructure can facilitate multidose vaccine series completion. SUMMARY Completion of multidose vaccine series is a challenge for immunization service delivery. Increased efforts are needed to address remaining barriers and improve vaccination coverage in the United States.
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Affiliation(s)
- Sarah Y. Michels
- Center for Population Health Research, University of Montana, Missoula, Montana
| | - Matthew F. Daley
- Institute for Health Research, Kaiser Permanente Aurora, Colorado
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
| | - Sophia R. Newcomer
- Center for Population Health Research, University of Montana, Missoula, Montana
- School of Public and Community Health Sciences, University of Montana, Missoula, Montana, USA
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Newcomer SR, Michels SY, Albers AN, Freeman RE, Graham JM, Clarke CL, Glanz JM, Daley MF. Vaccination Timeliness Among US Children Aged 0-19 Months, National Immunization Survey-Child 2011-2021. JAMA Netw Open 2024; 7:e246440. [PMID: 38607623 PMCID: PMC11015353 DOI: 10.1001/jamanetworkopen.2024.6440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 02/15/2024] [Indexed: 04/13/2024] Open
Abstract
Importance Delays in receiving vaccinations lead to greater vaccine-preventable disease risk. Timeliness of receipt of recommended vaccinations is not routinely tracked in the US, either overall or for populations that have known barriers to accessing routine health care, including lower-income families and children. Objective To measure vaccination timeliness among US children aged 0 to 19 months, overall and by socioeconomic indicators. Design, Setting, and Participants This serial, cross-sectional study analyzed nationally representative data from the 2011 to 2021 National Immunization Survey-Child (NIS-Child), an annual survey of parents, with immunization histories collected from clinicians administering vaccines. The 2020 and 2021 surveys largely reflected vaccinations in the US before the COVID-19 pandemic. Study participants included US children surveyed at ages 19 to 35 months. Data were analyzed from January to August 2023. Exposure Survey year. Main Outcomes and Measures The primary outcomes were average days undervaccinated (ADU) and percentage of children who received all vaccine doses on time (ie, 0 days undervaccinated) for the combined 7-vaccine series up to age 19 months. The mean adjusted annual change in on-time vaccination by socioeconomic indicators was calculated by use of multivariable log-linked binomial regression models. Results The surveys included 179 154 children (92 248 boys [51.2%]); 74 479 (31.4%, weighted) lived above the federal poverty level with more than $75 000 in annual family income, 58 961 (32.4%) lived at or above the poverty level with $75 000 or less in annual family income, and 39 564 (30.2%) lived below the poverty level. Overall, the median (IQR) ADU for the combined 7-vaccine series in the US decreased from 22.3 (0.4-71.5) days in the 2011 survey to 11.9 (0.0-55.5) days in the 2021 survey. The prevalence of on-time receipt of the combined 7-vaccine series increased from 22.5% (95% CI, 21.4%-23.6%) to 35.6% (95% CI, 34.2%-37.0%). Although children with more than $75 000 in annual family income had a 4.6% (95% CI, 4.0%-5.2%) mean annual increase in on-time vaccination, the mean annual increase was 2.8% (95% CI, 2.0%-3.6%) for children living at or above the poverty level with $75 000 or less in annual family income and 2.0% (95% CI, 1.0%-3.0%) for children living below the poverty level. Conclusions and Relevance In this cross-sectional study of NIS-Child data, improvements in vaccination timeliness were observed from the 2011 to the 2021 survey. However, widening disparities by socioeconomic indicators signal that increased efforts to facilitate timely vaccination among children in lower-income families are needed.
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Affiliation(s)
- Sophia R. Newcomer
- Center for Population Health Research, University of Montana, Missoula
- School of Public and Community Health Sciences, University of Montana, Missoula
| | - Sarah Y. Michels
- Center for Population Health Research, University of Montana, Missoula
| | - Alexandria N. Albers
- Center for Population Health Research, University of Montana, Missoula
- School of Public and Community Health Sciences, University of Montana, Missoula
| | - Rain E. Freeman
- Center for Population Health Research, University of Montana, Missoula
- College of Public Health, University of South Florida, Tampa
| | - Jon M. Graham
- Center for Population Health Research, University of Montana, Missoula
- Department of Mathematics, University of Montana, Missoula
| | | | - Jason M. Glanz
- Institute for Health Research, Kaiser Permanente Colorado, Aurora
- Department of Epidemiology, University of Colorado School of Public Health, Aurora
| | - Matthew F. Daley
- Institute for Health Research, Kaiser Permanente Colorado, Aurora
- Department of Pediatrics, University of Colorado School of Medicine, Aurora
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Tessier E, Newport D, Tran A, Nash SG, Mensah AA, Yun Wang T, Shantikumar S, Campbell H, Amirthalingam G, Todkill D. Pertussis immunisation strategies to optimise infant pertussis control: A narrative systematic review. Vaccine 2023; 41:5957-5964. [PMID: 37658001 DOI: 10.1016/j.vaccine.2023.08.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/20/2023] [Accepted: 08/25/2023] [Indexed: 09/03/2023]
Abstract
OBJECTIVE Countries routinely offering acellular pertussis vaccine, where long-term protection is not sustained, have the challenge of selecting an optimal schedule to minimise disease among young infants. We conducted a narrative systematic review and synthesis of information to evaluate different pertussis immunisation strategies at controlling pertussis disease, hospitalisation, deaths, and vaccine effectiveness among young infants. METHODS We conducted a review of the literature on studies about the primary, booster, and/or maternal vaccination series and synthesised findings narratively. Countries offering the first three doses of vaccine within six-months of life and a booster on or before the second year or life were defined as accelerated primary and booster schedules, respectively. Countries offering primary and booster doses later were defined as extended primary and booster schedules. All search results were screened, and articles reviewed and reconciled, by two authors. The Risk of Bias in Non-randomised Studies of Intervention tool was used to evaluate the risk of bias. FINDINGS A total of 98 studies were included in the analyses and the following recurring themes were described: timing of vaccination, vaccine coverage, waning immunity/vaccine effectiveness, direct and indirect effectiveness, switching from an accelerated to extended schedule, impact of changes in testing. The risk of bias was generally low to moderate for most studies. CONCLUSION Comparing schedules is challenging and there was insufficient evidence to that one schedule was superior to another. Countries must select a schedule that maintains high vaccine coverage and reduced the risk of delaying the delivery vaccines to protect infants.
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Affiliation(s)
| | - Daniel Newport
- Warwick Medical School, University of Warwick, Coventry, UK; University Hospitals of Birmingham NHS Trust, Birmingham, UK
| | - Anh Tran
- UK Health Security Agency, London, UK
| | | | | | | | | | | | | | - Daniel Todkill
- UK Health Security Agency, London, UK; Warwick Medical School, University of Warwick, Coventry, UK
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Machado-Alba JE, Machado-Duque ME, Vargas-Zambrano JC. High coverage and timeliness of vaccination of children under 6 years of age in Risaralda, Colombia. Hum Vaccin Immunother 2023; 19:2257424. [PMID: 37722884 PMCID: PMC10512904 DOI: 10.1080/21645515.2023.2257424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/07/2023] [Indexed: 09/20/2023] Open
Abstract
This study determined the coverage and timeliness of immunization in children <6 y from Risaralda, Colombia. A retrospective cross-sectional study evaluated data from a vaccination coverage and timeliness verification survey conducted in 2019, including 2457 children <6 y from Risaralda, Colombia. Variables included demographics, a record of vaccinations included in the Colombian Vaccination Plan, and date of immunization. Vaccination was defined as timely until 29 d after the day established by the plan. Coverage was over 95% for all vaccinations, except the boosters of diphtheria/pertussis/tetanus (DTP) and oral polio at 18 months (91.0%), influenza (85.6%), and yellow fever (49.2%). Most surveyed children demonstrated very high timeliness of vaccination, with values close to, or over, 90%, although there were exceptions for pentavalent (DTP+Haemophilus influenzae type B+hepatitis B) and polio vaccines at 6 months (79.4%), influenza (85.6%), and yellow fever (49.2%). Before the COVID-19 pandemic, Colombian Vaccination Plan demonstrated high coverage and timeliness of vaccination of children <6 y of age; however, timeliness for the third dose of DTP-Hib-HBV and polio showed opportunities for improvement.
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Affiliation(s)
- Jorge Enrique Machado-Alba
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira-Audifarma SA, Pereira, Colombia
| | - Manuel Enrique Machado-Duque
- Grupo de Investigación en Farmacoepidemiología y Farmacovigilancia, Universidad Tecnológica de Pereira-Audifarma SA, Pereira, Colombia
- Grupo de Investigación Biomedicina, Facultad de Medicina, Fundación Universitaria Autónoma de las Américas, Pereira, Colombia
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Michels SY, Niccolai LM, Hadler JL, Freeman RE, Albers AN, Glanz JM, Daley MF, Newcomer SR. Failure to Complete Multidose Vaccine Series in Early Childhood. Pediatrics 2023; 152:e2022059844. [PMID: 37489285 PMCID: PMC10389773 DOI: 10.1542/peds.2022-059844] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/09/2023] [Indexed: 07/26/2023] Open
Abstract
BACKGROUND Most early childhood immunizations require 3 to 4 doses to achieve optimal protection. Our objective was to identify factors associated with starting but not completing multidose vaccine series. METHODS Using 2019 National Immunization Survey-Child data, US children ages 19 to 35 months were classified in 1 of 3 vaccination patterns: (1) completed the combined 7-vaccine series, (2) did not initiate ≥1 of the 7 vaccine series, or (3) initiated all series, but did not complete ≥1 multidose series. Associations between sociodemographic factors and vaccination pattern were evaluated using multivariable log-linked binomial regression. Analyses accounted for the survey's stratified design and complex weighting. RESULTS Among 16 365 children, 72.9% completed the combined 7-vaccine series, 9.9% did not initiate ≥1 series, and 17.2% initiated, but did not complete ≥1 multidose series. Approximately 8.4% of children needed only 1 additional vaccine dose from 1 of the 5 multidose series to complete the combined 7-vaccine series. The strongest associations with starting but not completing multidose vaccine series were moving across state lines (adjusted prevalence ratio [aPR] = 1.45, 95% confidence interval [CI]: 1.18-1.79), number of children in the household (2 to 3: aPR = 1.29, 95% CI: 1.05-1.58; 4 or more: aPR = 1.68, 95% CI: 1.30-2.18), and lack of insurance coverage (aPR = 2.03, 95% CI: 1.42-2.91). CONCLUSIONS More than 1 in 6 US children initiated but did not complete all doses in multidose vaccine series, suggesting children experienced structural barriers to vaccination. Increased focus on strategies to encourage multidose series completion is needed to optimize protection from preventable diseases and achieve vaccination coverage goals.
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Affiliation(s)
- Sarah Y. Michels
- Yale School of Public Health, New Haven, Connecticut
- Center for Population Health Research, University of Montana, Missoula, Montana
| | | | | | - Rain E. Freeman
- Center for Population Health Research, University of Montana, Missoula, Montana
| | - Alexandria N. Albers
- Center for Population Health Research, University of Montana, Missoula, Montana
- School of Public and Community Health Sciences, University of Montana, Missoula, Montana
| | - Jason M. Glanz
- Institute for Health Research, Kaiser Permanente Colorado, Aurora, Colorado
- Department of Epidemiology, University of Colorado School of Public Health, Aurora, Colorado
| | - Matthew F. Daley
- Institute for Health Research, Kaiser Permanente Colorado, Aurora, Colorado
- Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
| | - Sophia R. Newcomer
- Center for Population Health Research, University of Montana, Missoula, Montana
- School of Public and Community Health Sciences, University of Montana, Missoula, Montana
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Wang Y, Shi N, Wang Q, Yang L, Cui T, Jin H. The association between vaccine hesitancy and pertussis: a systematic review and meta-analysis. Ital J Pediatr 2023; 49:81. [PMID: 37443026 DOI: 10.1186/s13052-023-01495-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 07/10/2023] [Indexed: 07/15/2023] Open
Abstract
BACKGROUND Robust routine immunization schedules for pertussis-containing vaccines have been applied for years, but pertussis outbreaks remain a worldwide problem. This study aimed to investigate the association between vaccine hesitancy and pertussis in infants and children. METHODS We searched PubMed, Cochrane, Web of Science, Embase, and China National Knowledge Internet for studies published between January 2012 and June 2022. This study included case-control and cohort studies that assessed the association between childhood/maternal vaccine hesitancy and odds ratios (ORs), risk ratios (RRs), and vaccine effectiveness (VE) related to pertussis in infants and children [Formula: see text] 9 years old. ORs/VEs with a 95% confidence interval (CI) were calculated. Random-effects meta-analysis models were used for appropriate pooled estimates, and heterogeneity was assessed using [Formula: see text]. Cumulative meta-analysis and subgroup analyses stratified by study characteristics were performed. RESULTS Twenty-two studies were included, with a mean quality score of 7.0 (range 6.0-9.0). Infants and children with pertussis were associated with higher vaccine hesitancy to all doses (OR = 4.12 [95% CI: 3.09-5.50]). The highest OR was between children who were unvaccinated over four doses and children who were fully vaccinated (OR = 14.26 [95%CI: 7.62-26.70]); childhood vaccine delay was not statistically significantly associated with pertussis risk (OR = 1.18 [95% CI: 0.74-1.89]). Maternal vaccine hesitancy was associated with significantly higher pertussis risk in infants aged 2 and 3 months old, with higher pertussis ORs in infants [Formula: see text] 2 months old (OR = 6.02 [95%CI: 4.31-8.50], OR = 5.14 [95%CI: 1.95-13.52] for infants [Formula: see text] 2 and [Formula: see text] 3 months old, respectively). Maternal and childhood VEs were high in reducing pertussis infection in infants and children. The administration time of maternal vaccination had little effect on VE. CONCLUSION Vaccine hesitancy increased pertussis risks in infants and children. Ensuring that children receive up-to-date pertussis vaccines is essential; short delays in receiving childhood vaccinations may be unimportant. Maternal vaccinations for pertussis should be encouraged.
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Affiliation(s)
- Yuning Wang
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China
| | - Naiyang Shi
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China
| | - Qiang Wang
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China
| | - Liuqing Yang
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China
| | - Tingting Cui
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China
| | - Hui Jin
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, 210009, China.
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, China.
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Boghani S, Shah HD, Fancy M, Parmar T, Bansal S, Wanjari MB, Saxena D. A Study on the Characteristics and Outcomes of Reported Diphtheria Patients in a Western State in India. Cureus 2023; 15:e35769. [PMID: 37025722 PMCID: PMC10072171 DOI: 10.7759/cureus.35769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 03/04/2023] [Indexed: 03/07/2023] Open
Abstract
Background The incidence of diphtheria cases has declined significantly from 1,00,000 cases in 1980 to 2500 in 2015 globally. India contributed to half of the diphtheria cases reported globally from 2001 to 2015. The disease has higher case mortality and morbidity rate due to various geographic-specific factors. The current study aims to outline the characteristics and outcomes of the diphtheria-reported patients of Gujarat, a western state of India. Method A record-based, descriptive retrospective study was undertaken in the western state of India by analyzing district-wise reported diphtheria cases in diphtheria, tetanus, and pertussis (DPT) surveillance program format during 2020-2021. Result Out of 446, most patients were reported from selected geographies of Gujarat state in 2020-2021. The 424 (95%) reported cases were from 0-14 years of age. Only 9 (2%) subjects had a travel history, and 369 (82.7%) patients were reported from rural areas. The time trend analysis showed that 339 (76%) patients were reported from September to December. The case-fatality ratio was 5.4%, and 300 (67.2%) cases didn't take the DPT (DPT3)/pentavalent 3rd dose vaccine and subsequent doses during their lifetime, emphasizing the role of the vaccine in preventing diphtheria disease. Conclusion Increased vaccination coverage and completing all doses of the DPT vaccine are crucial to avert deaths due to diphtheria. An effective surveillance system will aid in early disease detection and provide more information on the factors that lead to disease occurrence for prompt action by the authority.
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Affiliation(s)
- Sadab Boghani
- Department of Public Health Science, Indian Institute of Public Health Gandhinagar, Gandhinagar, IND
| | - Harsh D Shah
- Department of Public Health Science, Indian Institute of Public Health Gandhinagar, Gandhinagar, IND
| | - Manish Fancy
- Department of Public Health, Health and Family Welfare, Government of Gujarat, Gujarat, IND
| | - Trushar Parmar
- Department of Public Health, Management Sciences for Health, New Delhi, IND
| | - Shikha Bansal
- Department of Public Health, World Health Organization, New Delhi, IND
| | - Mayur B Wanjari
- Department of Research and Development, Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences, Wardha, IND
| | - Deepak Saxena
- Department of Public Health Science, Indian Institute of Public Health Gandhinagar, Gandhinagar, IND
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Yin Z, Zheng C, Fang Q, Wen T, Wang S, Li J, Gong X, Xiang Z. Comparing the pertussis antibody levels of healthy children immunized with four doses of DTap-IPV/Hib (Pentaxim) combination vaccine and DTaP vaccine in Quzhou, China. Front Immunol 2023; 13:1055677. [PMID: 36685526 PMCID: PMC9852981 DOI: 10.3389/fimmu.2022.1055677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 12/16/2022] [Indexed: 01/09/2023] Open
Abstract
Despite the high coverage of pertussis vaccines in high-income countries, pertussis resurgence has been reported in recent years, and has stimulated interest in the effects of vaccines and vaccination strategies. Immunoglobulin G (IgG) antibodies against pertussis toxoid (PT), filamentous hemagglutinin (FHA), and pertactin (PRN) after immunization with four doses of co-purified or component vaccines were determined by enzyme-linked immunosorbent assay (ELISA). Serological data of PT-IgG geometric mean concentrations (GMCs) over time since vaccination were used to fit the mathematical models. A total of 953 children were included in this study; 590 participants received four doses of the component acellular vaccine and 363 participants received four doses of the co-purified acellular vaccine. The GMCs and the seropositivity rate of pertussis IgG were significantly influenced by the production methods, and the immunogenicity of the component acellular vaccine was superior to that of the co-purified acellular vaccine. The fitted mathematical models for the component acellular vaccine and the co-purified acellular vaccine were Y=91.20e-0.039x and Y=37.71x-0.493, respectively. The initial GMCs of the component acellular vaccine was higher than that of the co-purified acellular vaccine, but both were similar at 72 months after immunization. Pertussis IgG levels waned over time after four doses of acellular pertussis vaccine, regardless of whether component or co-purified vaccine was used. The development and promotion of component acellular pertussis vaccines should be accelerated in China, and booster doses of pertussis vaccine in adolescents, adults, and pregnant women should be employed.
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Affiliation(s)
- Zhiying Yin
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China,School of Public Health, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China,*Correspondence: Zhiying Yin, ; Ziling Xiang,
| | - Canjie Zheng
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China
| | - Quanjun Fang
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China
| | - Tingcui Wen
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Shuangqing Wang
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China
| | - Junji Li
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China
| | - Xiaoying Gong
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China
| | - Ziling Xiang
- Department of Immunity, Quzhou Center for Disease Control and Prevention, Quzhou, Zhejiang, China,*Correspondence: Zhiying Yin, ; Ziling Xiang,
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Michels SY, Freeman RE, Williams E, Albers AN, Wehner BK, Rechlin A, Newcomer SR. Evaluating vaccination coverage and timeliness in American Indian/Alaska Native and non-Hispanic White children using state immunization information system data, 2015-2017. Prev Med Rep 2022; 27:101817. [PMID: 35656223 PMCID: PMC9152883 DOI: 10.1016/j.pmedr.2022.101817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 04/22/2022] [Accepted: 04/30/2022] [Indexed: 11/29/2022] Open
Abstract
Comprehensive estimates of vaccination coverage and timeliness of vaccine receipt among American Indian/Alaska Native (AI/AN) children in the United States are lacking. This study’s objectives were to quantify vaccination coverage and timeliness, as well as the proportion of children with specific undervaccination patterns, among AI/AN and non-Hispanic White (NHW) children ages 0–24 months in Montana, a large and primarily rural U.S. state. Data from Montana’s immunization information system (IIS) for children born 2015–2017 were used to calculate days undervaccinated for all doses of seven recommended vaccine series. After stratifying by race/ethnicity, up-to-date coverage at key milestone ages and the proportion of children demonstrating specific patterns of undervaccination were reported. Among n = 3,630 AI/AN children, only 23.1% received all recommended vaccine doses on-time (i.e., zero days undervaccinated), compared to 40.4% of n = 18,022 NHW children (chi-square p < 0.001). A greater proportion of AI/AN children were delayed at each milestone age, resulting in lower overall combined 7-vaccine series completion, by age 24 months (AI/AN: 56.6%, NHW: 64.3%, chi-square p < 0.001). As compared with NHW children, a higher proportion of AI/AN children had undervaccination patterns suggestive of structural barriers to accessing immunization services and delayed starts to vaccination. More than three out of four AI/AN children experienced delays in vaccination or were missing doses needed to complete recommended vaccine series. Interventions to ensure on-time initiation of vaccine series at age 2 months, as well initiatives to encourage completion of multi-dose vaccine series, are needed to reduce immunization disparities and increase vaccination coverage among AI/AN children in Montana.
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Affiliation(s)
- Sarah Y. Michels
- Yale School of Public Health, New Haven, CT, United States
- University of Montana, Center for Population Health Research, Missoula, MT, United States
- Corresponding author at: University of Montana, Center for Population Health Research, 32 Campus Drive, Skaggs 173, Missoula, MT 59804, United States.
| | - Rain E. Freeman
- University of Montana, Center for Population Health Research, Missoula, MT, United States
- University of Montana, School of Public and Community Health Sciences, Missoula, MT, United States
| | - Elizabeth Williams
- University of Montana, Center for Population Health Research, Missoula, MT, United States
- University of Montana, School of Public and Community Health Sciences, Missoula, MT, United States
- All Nations Health Center, Missoula, MT, United States
| | - Alexandria N. Albers
- University of Montana, Center for Population Health Research, Missoula, MT, United States
- University of Montana, School of Public and Community Health Sciences, Missoula, MT, United States
| | - Bekki K. Wehner
- Montana Department of Public Health and Human Services, Immunization Section, Helena, MT, United States
| | - Annie Rechlin
- Montana Department of Public Health and Human Services, Immunization Section, Helena, MT, United States
| | - Sophia R. Newcomer
- University of Montana, Center for Population Health Research, Missoula, MT, United States
- University of Montana, School of Public and Community Health Sciences, Missoula, MT, United States
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