Infant Immunization Research Articles

A whole-cell pertussis vaccine engineered to elicit reduced reactogenicity protects baboons against pertussis challenge.

Whole-cell pertussis (wP) vaccines introduced in the 1940s led to a dramatic reduction of pertussis incidence and are still widely used in low- and middle-income countries (LMICs) worldwide. The reactogenicity of wP vaccines resulted in reduced public acceptance, which drove the development and introduction of acellular pertussis (aP) vaccines in high-income countries in the 1990s. Increased incidence of pertussis disease has been observed in high-income countries following the introduction of aP vaccines despite near universal rates of pediatric vaccination. These increases are attributed to the reduced protection against colonization, carriage, and transmission as well as reduced duration of immunity conferred by aP vaccines relative to the wP vaccines they replaced. A reduced reactogenicity whole-cell pertussis (RRwP) vaccine was recently developed with the goal of achieving the same protection as conferred by wP vaccination but with an improved safety profile, which may benefit countries in which wP vaccines are still in routine use. In this study, we tested the RRwP vaccine in a baboon model of pertussis infection. We found that the RRwP vaccine induced comparable cellular and humoral immune responses and comparable protection following challenge relative to the wP vaccine, while significantly reducing injection-site reactogenicity.IMPORTANCEThe World Health Organization (WHO) recommended in 2015 that countries administering wP vaccines in their national vaccine programs should continue to do so, and that switching to aP vaccines for primary infant immunization should only be considered if periodic booster vaccinations and/or maternal immunization could be assured and sustained in their national immunization schedules (WHO, Vaccine 34:1423-1425, 2016, https://doi.org/10.1016/j.vaccine.2015.10.136). Due to the considerably higher cost of aP vaccines and the larger number of doses required, most LMICs continue to use wP vaccines. The development and introduction of a wP vaccine that induces fewer adverse events without sacrificing protection would significantly benefit countries in which wP vaccines are still in routine use. The results of this study indicate this desirable goal may be achievable.

Clinician Staffing and Quality of Care in US Health Centers

Health centers are vital primary care safety nets for underserved populations, but optimal clinician staffing associated with quality care is unclear. Understanding the association of clinician staffing patterns with quality of care may inform care delivery, scope-of-practice policy, and resource allocation. To describe the association of clinician staffing models and ratios with quality-of-care metrics in health centers. This cross-sectional study of US health centers used data from the 2022 Health Resources and Services Administration Uniform Data System (UDS). Clinician staffing ratios, expressed as the fraction of full-time equivalents (FTEs) per 1000 visits of physicians, advanced practice registered nurses (APRNs), and physician associates (PAs) to total clinician FTEs at each health center. Percentage of eligible patients receiving the corresponding service or outcome for 14 individual clinical quality metrics collected by the UDS, including infant immunizations; screening for cancer, depression, tobacco use, hypertension, HIV, and glycated hemoglobin levels; weight and body mass index (BMI) assessment; and appropriate statin, aspirin, and/or antiplatelet therapy. This analysis of 791 health centers serving 16 114 842 patients (56.6% female) identified 5 clinician staffing models: balanced (similar FTEs of physicians, APRNs, and PAs; 152 [19.2%] of health centers), higher FTEs of APRNs than physicians (174 [22.0%]), higher FTEs of physicians than APRNs (160 [20.2%]), approximately equal FTEs of physicians and APRNs (263 [33.2%]), and large scale (42 [5.3%]). Adjusted linear models showed positive associations between physician FTEs per 1000 visits and cervical (β, 14.9; 95% CI, 3.1-26.7), breast (β, 15.7; 95% CI, 3.2-28.1), and colorectal (β, 18.3; 95% CI, 6.0-30.6) cancer screening. Generalized additive models showed nonlinear positive associations beginning at a physician FTE ratio of 0.45 (95% CI, 0.02-6.22) for infant vaccinations, 0.39 (95% CI, 0.05-2.21) for cervical cancer screening, 0.39 (95% CI, 0.02-1.67) for breast cancer screening, 0.47 (95% CI, 0.00-5.76) for HIV testing, and 0.70 (95% CI, 0.18-19.96) for depression in remission; APRN FTE ratio of 0.45 (95% CI, 0.17-7.46) for adult BMI assessment; and PA FTE ratio of 0.16 (95% CI, 0.11-3.88) for infant vaccinations. Staffing models were not associated with 7 of the 14 metrics analyzed. In this cross-sectional study of health centers, physician FTE ratio was associated with higher performance in cancer screening, infant vaccinations, and HIV testing; APRN FTE ratio was associated with higher performance in preventative health assessments; and PA FTE ratio was associated with higher performance in infant vaccination. These findings suggest that targeted staffing strategies may be associated with quality of care in certain domains and that tailored approaches to health center staffing based on community-specific needs are warranted.

The effect of baby touch on premature infants

Objective: Premature infants require special attention during nursing. This study aimed to explore the effects of baby touch on the growth, immunity, sleep and communication in premature infants. Methods: This was a retrospective study. A total of 64 premature infants with a gestational age of 30-36 weeks were selected at Maternity & Child Care Center of Qinhuangdao from June 2022 to May 2023, and randomly divided into experimental group and control group. The control group received routine comprehensive nursing care for newborns, while the experimental group was additionally treated with touch intervention using the international standard touch method. The effects of the three months touch on the growth and development, immunological function, sleep quality, and emotional communication of the premature infants were observed. Results: No statistically significant differences were found in gender, gestational age, birth weight, birth length, or head circumference at birth between the two groups (p> 0.05). In the third month, the increases in body weight, body length and head circumference were significantly more obvious, the immunological function indicators including CD3+, CD4+, CD8+, IgG, IgA and IgM were all significantly higher, the sleep time and sleep quality were both significantly superior, and the interaction time and intimacy with parents were significantly superior in the experimental group compared with the control group, with statistically significant differences (p< 0.05). Conclusion: Baby touch can promote growth and development, strengthen immunological function, improve sleep quality and enhance the emotional communication abilities of premature infants, and help them better adapt to the environment and grow. doi: https://doi.org/10.12669/pjms.40.10.9275 How to cite this: Du Q, Zhu H, Guo M, Yang Q, Yang H, Ma Y. The effect of baby touch on premature infants. Pak J Med Sci. 2024;40(10):2256-2260. doi: https://doi.org/10.12669/pjms.40.10.9275 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

ANALYSIS BETWEEN KNOWLEDGE AND ATTITUDES OF PARENTS REGARDING PROVIDING DOUBLE IMMUNIZATION AT THE MINASA UPA COMMUNITY HEALTH CENTER

Immunization is the act of providing immunity against a disease by introducing specific substances into the body. The completeness of immunization can be influenced by several factors such as knowledge, attitudes, number of children, health worker attitudes, family support, distance from home, education, socio-cultural factors, and community trust. This study aims to determine the relationship between parental knowledge and attitudes toward administering double immunization in infants conducted at the Minasa Upa Community Health Center. The research method used was quantitative research with an observational analytic design with a cross-sectional approach and a non-probability sampling method with a purposive sampling technique, resulting in 85 samples. The study results found that most respondents had good levels of knowledge, with 46 respondents or 54.1%, and exhibited positive attitudes, with 43 respondents or 50.6%. The highest number of respondents who administered double immunization to infants were found to have good knowledge, accounting for 67.4%, with a P-value of 0.003. Meanwhile, the number of respondents who administered double immunization and had positive attitudes was 69.8%, with a P-value of 0.001. Based on this research, it can be concluded that there is a significant relationship between parental knowledge and attitudes towards the administration of double immunization in infants.

Hubungan Persepsi Orang Tua dengan Kelengkapan Imunisasi Dasar pada Bayi Usia 9-12 Bulan

mmunization is a crucial preventive measure to protect children from infectious diseases. However, in Botolinggo, there are still parents who do not complete the basic immunization for their infants. This study aims to analyze the relationship between parental perception and the completeness of basic immunization in infants aged 9-12 months. A cross-sectional study design was employed, involving parents of infants aged 9-12 months in the working area of Botolinggo Health Center, Bondowoso Regency. The sample size of 63 respondents was determined using Power Analysis and selected through total sampling. Data were collected using a questionnaire and a basic immunization completeness assessment form, and subsequently analyzed using chi-square statistical analysis with a significance level of p < 0.05. The statistical test results showed X2 = 16.361 and p < 0.001, indicating a significant relationship between parental perception and the completeness of basic immunization. Parents with a positive perception are more likely to complete their infants' basic immunization. In conclusion, parental perception significantly influences behavior in completing infant immunization.

Characteristics of children with invasive pneumococcal disease eligible for the 1+1 compared with the 2+1 PCV13 infant immunisation schedule in England: a prospective national observational surveillance study

On Jan 1, 2020, the UK transitioned from a 2+1 to a 1+1 national infant immunisation schedule with the 13-valent pneumococcal conjugate vaccine (PCV13). We assessed whether the 1+1 PCV13 schedule had any impact on incidence, disease characteristics, or outcomes after invasive pneumococcal disease (IPD) in eligible children aged 0-3 years. The UK Health Security Agency conducts IPD surveillance and serotyping of invasive pneumococcal isolates via whole-genome sequencing in England. IPD was defined as identification of Streptococcus pneumoniae in a sterile site. We compared IPD incidence, demographics, clinical presentation, comorbidity prevalence, serotype distribution, and case-fatality rates (CFRs) in children from a single birth cohort eligible for the 1+1 schedule (born between Jan 1, 2020, and Dec 31, 2022) who developed IPD in the 2022-23 financial year (April to March) with children from three equivalent historical birth cohorts (born between Jan 1, 2015, and Dec 31, 2019) eligible for the 2+1 schedule who developed IPD during three respective pre-pandemic financial years: 2017-18, 2018-19, and 2019-20. There were a total of 702 IPD episodes in 697 children, including 158 (incidence 8·99 per 100 000 person-years) in the single 1+1 birth cohort and 544 (incidence 9·39 per 100 000 person-years) in the 2+1 birth cohorts, with no significant difference in the incidence of overall IPD (incidence rate ratio 0·96, 95% CI 0·80-1·14, p=0·63), PCV13-type IPD (1·21, 0·71-2·00, p=0·45), or pneumococcal meningitis (0·97, 0·66-1·40, p=0·88). Comorbidity prevalence, clinical presentation, and CFRs were also similar between the two cohorts, as was the percentage of cases in infants too young to be vaccinated (<2 months old) and infants aged 5-11 months who received one or two PCV13 priming doses, in the 1+1 and 2+1 cohorts respectively. After 3 years, the 1+1 schedule continues to provide direct and indirect protection against PCV13-type IPD in children, with no significant change in overall IPD incidence, serotype distribution, clinical presentation, or CFRs in children eligible for the 1+1 compared with the 2+1 schedule. Ongoing surveillance will be important to assess longer-term direct and indirect population protection. None.

June 2024 ACIP Meeting Update: Influenza, COVID-19, RSV, and Other Vaccines.

The Advisory Committee on Immunization Practices (ACIP), a group of medical and public health experts that provides advice to the Centers for Disease Control and Prevention, normally meets 3 times per year to develop US vaccine recommendations. The ACIP met June 26 through 28, 2024. This update summarizes the proceedings of this meeting, with an emphasis on topics that are most relevant to the pediatric population. Major updates for pediatric clinicians include COVID-19 and influenza vaccine recommendations for the 2024 to 2025 season, meningococcal vaccination considerations, information regarding preferred Haemophilus influenzae type B containing vaccines for American Indian and Alaskan Native infants, and updates regarding implementation and effectiveness of RSV immunization in pregnant people and infants.

Association between pregnancy intention and completion of newborn and infant continuum of care in Sub-Saharan Africa: systematic review and meta-analysis

BackgroundThe newborn and infant continuum of care such as essential newborn care, early initiation and exclusive breastfeeding, and immunisation are highly recommended for improving the quality of life and survival of infants. However, newborn and infant mortality remains high across Sub-Saharan African countries. While unintended pregnancies are associated with adverse newborn and infant health outcomes, there is inconclusive evidence on whether pregnancy intention influences newborn and infant continuum of care completion. Therefore, this review aimed to pool findings reported in the literature on the association between pregnancy intention and newborn and infant health care across the continuum of care in Sub-Saharan Africa.MethodsWe searched MEDLINE Complete, EMBASE, CINAHL Complete, and Global Health databases for studies potentially eligible for this systematic review and meta-analysis. Two researchers independently screened the identified articles by abstract and title, and then full-text using Covidence. We used the Newcastle–Ottawa Scale to assess the quality of the included studies. The Cochran’s Q test and I2 were executed to detect and quantify the presence of statistical heterogeneity in the studies. Meta-analysis was done for each outcome when more than one original study reported relevant data, using Stata statistical software version 18.ResultsEleven studies were included from a total of 235 articles identified by the search. The odds of completing essential newborn care (pooled odds ratio: 3.04, 95% CI: 1.56, 5.90), early initiation of breastfeeding (pooled odds ratio: 1.30, 95% CI: 1.13, 1.52), exclusive breastfeeding (pooled odds ratio: 2.21, 95% CI: 1.68, 2.89), and being fully immunised (pooled odds ratio: 2.73, 95% CI: 1.16, 6.40) were higher among infants born to women with intended pregnancies as compared to women with unintended pregnancies.ConclusionIntended pregnancy was positively associated with essential newborn care completion, early initiation and exclusive breastfeeding, and full immunisation of infants in SSA countries. Thus, policy-makers and stakeholders should strengthen the provision of quality family planning services to prevent unintended pregnancy. Furthermore, follow-up of women with unintended pregnancies is needed to increase women’s opportunity to access essential newborn health care services that further reduce the risk of newborn and infant morbidity and mortality.Systematic review registrationPROSPERO registration number CRD42023409148.

Gestational Diabetes Mellitus-Induced Milk Fat Globule Membrane Protein Changes of Human Mature Milk Based on TMT Proteomic Analysis

Breastfeeding by mothers with gestational diabetes mellitus (GDM) has been shown to reduce maternal insulin demands and diminish the risks of diabetes in infants, leading to improved long-term health outcomes. Milk fat globule membrane (MFGM) proteins play a crucial role in influencing the immunity and cognitive development of infants. Understanding the alterations in MFGM proteins in breastmilk from mothers with GDM is essential for enhancing their self-efficacy and increase breastfeeding rates. The objective of this study is to investigate and compare MFGM proteins in milk from mothers with GDM and without based on tandem mass tag (TMT) labeling and liquid chromatography tandem mass spectrometry (LC-MS) techniques. A total of 5402 proteins were identified, including 4 upregulated proteins and 24 downregulated proteins. These significantly altered proteins were found to be associated with human diseases, cellular processes, and metabolism pathways. Additionally, the oxidative phosphorylation pathway emerged as the predominant pathway through Gene Set Enrichment Analysis (GSEA) involving all genes.

Assessment of Complete Immunization Coverage in Infants Aged 0-12 Months

Achievement of Complete Basic Immunization (IDL) in eleven Indonesian provinces in 2022 is still below the national target of 90%. The eleven provinces in question are West Sulawesi, Southeast Sulawesi, Maluku, East Nusa Tenggara, North Kalimantan, Riau, West Kalimantan, West Papua, West Sumatra, Papua and Aceh.The type of research used in this research is descriptive observational research. The data used in this study is secondary data, namely monthly reports on the results of routine immunizations for babies. It was found that the majority of basic immunization coverage for babies born in January 2022 was higher than for babies born in January 2023. Coverage for basic immunization types for babies was highest in 2022. (73.3%) was obtained from Hepatitis B, BCG, and Polio 1 immunization. The highest coverage of basic types of infant immunization in 2023 was obtained from Hepatitis B immunization (73.3%). Hepatitis B immunization received a high score for babies born in January 2022. Coverage of basic immunization types for babies born in January 2022 for types DPT-HB-Hib 1, 2, 3, Polio 2, 3, 4, received 36.7% -73, 3%, and Measles-Rubella got 33.3%. The frequency of immunization against PVC-1 (23.3%), RV-1 (6.7%), and IPV-1 (13.3%) is still low due to not visiting posyandu and giving immunizations past the immunization deadline. The average value of basic immunization coverage for babies born in January 2023 (10%) is lower than babies born in January 2022 (43.3%) with a difference of 33.3%.

Exploring distraction techniques and parental satisfaction during infant immunization: a pilot study in aspirational district Darrang and non-aspirational districts Karimganj of Assam

Background: In India, the percentage of children aged 12-23 months who have had full immunization coverage (FIC) has increased dramatically from 62% to 76%. UNICEF, 2022. As stated in the WHO report for 2022. Global coverage decreased to 81% in 2021 from 86% in 2019. Methods: The study’s methodology involved studying how the 4 S’s technique, oral sucrose, and each of them affect parents’ satisfaction and infants’ perception of pain after vaccination in Darrang aspirational and Karimganj non-aspirational districts. Eighty infants were involved in the pilot project, split into four groups of ten infants each. Results: In the study at Civil Hospital Mangaldoi, group C reported the highest parental satisfaction (mean=3.2) with no dissatisfaction and the lowest mean pain intensity (1.3, SD=0.48). Group A had 100% satisfaction (mean=3.1, SD=0.31), group B had 90% satisfaction (mean=3.0, SD=0.47), and the control group had the lowest satisfaction (30%, mean=2.3, SD=0.67) with 70% dissatisfaction. Group C’s outcomes demonstrate both the highest satisfaction and the least intense, most consistent pain perception among participants. Conclusions: This study’s conclusion emphasizes how critical it is to overcome vaccine reluctance and enhance immunization experiences by employing efficient pain control strategies. The findings support the implementation of interventions such as sucrose administration and other pharmacological and non-pharmacological approaches to reduce pain associated with vaccinations, particularly in paediatric populations.

Gut Mucosal Immunity in HIV-Exposed Infants: A Review

Gut mucosal immunity in infants exposed to Human Immunodeficiency Virus (HIV) presents a complex interplay of developmental processes, viral dynamics, and therapeutic interventions that significantly impact clinical outcomes. This review synthesizes current knowledge on the mechanisms, clinical implications, and therapeutic strategies concerning gut mucosal immunity in HIV-exposed infants. The gut mucosa serves as a critical site for immune maturation and defense against pathogens, but HIV infection disrupts this delicate balance, leading to compromised immune function and increased susceptibility to infections. Infants born to HIV-positive mothers experience unique challenges in gut mucosal immunity due to vertical transmission of the virus and exposure to antiretroviral therapy (ART). HIV infection disrupts gut-associated lymphoid tissue (GALT), resulting in early depletion of CD4+ T cells and compromised mucosal barrier function. These alterations contribute to microbial translocation, chronic inflammation, and immune dysregulation, impacting overall immune competence and increasing susceptibility to opportunistic infections. Despite advances in ART, persistent immune activation and residual gut mucosal damage pose ongoing challenges in achieving optimal immune reconstitution and preventing long-term complications in HIV-exposed infants. Clinical implications of compromised gut mucosal immunity in HIV-exposed infants extend beyond gastrointestinal health to encompass systemic immune dysfunction and increased risks of non-AIDS comorbidities. Impaired gut barrier function exacerbates microbial translocation, leading to systemic inflammation that may contribute to neurodevelopmental abnormalities and metabolic disorders. Keywords: Gut, Immunity, HIV, Infants

Knowledge, attitude, and practice of Chinese parents with infants (aged 0-3 years) toward immunity, gut microbiota and biotics: a comprehensive study.

In the wake of the COVID-19 pandemic, there has been an increasing focus towards infant immunity. The development and maintenance of the immune system are significantly influenced from birth, and is shaped by early-life infant feeding behavior. Hence, the knowledge, attitude, and practice (KAP) of parents play a crucial role in shaping the immune system of infants. A total of 2369 parents across 19 cities in China were surveyed using a self-designed online questionnaire. The KAP questionnaire assessed three domains: immunity, gut microbiota, and biotics (prebiotics, probiotics, and synbiotics). The questionnaire also included questions on infant health. An overwhelming majority of parents (97.90%) placed high value on their children's immunity, and 40.40% of them reported an increased level of concern following the COVID-19 pandemic. Diarrhea (78.80%), colds (75.70%), nighttime crying (73.80%), regurgitation (71.70%) and food retention (66.50%) were the major health issues reported. Knowledge scores toward immunity and gut microbiota were positively correlated to attitude and practice scores, respectively. Attitude scores toward immunity, gut microbiota and biotics were positively correlated to their respective practice scores. Parental knowledge score on immunity was negatively correlated with diarrhea, colds, regurgitation and food retention. On the other hand, parental practice scores toward immunity were negatively correlated with food retention. In regards to gut microbiota, parental knowledge score was negatively correlated with diarrhea, regurgitation and food retention; parental attitude score was negatively correlated with nighttime crying whereas practice score was negatively correlated with diarrhea, regurgitation, food retention and nighttime crying. Attitude score toward biotics was negatively correlated with nighttime crying and practice scores toward biotics was negatively correlated with colds, food retention and nighttime crying. This study demonstrated that significant gaps and misunderstandings exist among parents regarding immunity, gut microbiota health, and biotics. Both public education and interventions are crucial to enhance parental knowledge and practices, thereby improving infant immunity.

Microbiota and gut immunity in infants and young children

The human gut microbiome plays a critical role in maintaining human health, particularly in the intricate relationship between stable microbial communities in the gastrointestinal tract and the early development of host immunity. After birth, the maturation of immune cells and the gut microbiome occur simultaneously, adapting to the complexities of the gut environment. The close link between the gut microbiome and the immune system has far-reaching implications, influencing the onset of several diseases in infants and young children, such as food allergies, necrotizing colitis, obesity, and inflammatory bowel disease. Consequently, the composition of the infant gut microbiome serves as a predictive factor for disease risk and progression. The establishment of a symbiosis between the immune system and the gut microbiome has significant implications for susceptibility or resistance to disease later in life. Maternal factors, including mode of delivery and feeding practices, exert a significant influence on the infant gut microbiota.

Progress in research and development of preventive vaccines for children in China.

The infant and child stage is an important stage for the continuation and development of human society. The initial years of life have a lasting impact on a child's future. Children under the age of 5 have an immature immune system, especially infants and young children under 6 months of age. At this stage, the population has a low immunity to pathogen infections, making them vulnerable to bacteria and viruses. Vaccination can enhance the immunity of infants and children to specific diseases, reduce the transmission rate of infectious diseases, and promote the development of global public health. This article summarizes the current application status of Rotavirus (RV) vaccine, Hand-foot -mouth disease (HFMD) vaccine, and Pneumococcal Conjugate Vaccine (PCV) in China, as well as the research progress of clinical trial vaccine, laying a foundation for subsequent vaccine development.

Addressing a missed opportunity for contraceptive use during the extended postpartum period by integrating it with infant immunization services in Sidama Region, Ethiopia: A quasi-experimental study.

Globally, unmet need for postpartum family planning is high. However, immunization services are among the most widely utilized health services. Establishing systematic screening, counseling, and referral systems from different contact points, particularly from EPI units may improve postpartum family planning uptake. Hence, this study aimed to assess the effect of counseling for family planning at EPI units on contraceptive uptake during the extended post-partum period. A before-and-after type of quasi-experimental study was conducted in 8 purposively selected primary health care units in Sidama region, Ethiopia. All mothers visiting the selected health facilities for infant immunization services from February 06 to August 30, 2020, were screened, counseled, and referred for family planning. A structured interviewer-administered questionnaire was used to collect data from 1421 randomly selected mothers (717 for pre-intervention and 704 post-intervention phases). EpiData version 3.1 and SPSS version 22 were used for data entry and analysis. The effect of the intervention was assessed using multivariable logistic regression analysis adjusting for the effects of potential confounders. P value < 0.05 was considered statistically significant. The contraceptive utilization rate before intervention was 72.7% with 95% CI (69.5, 75.9). It was 91.9%, 95% CI (89.8%, 93.9%) after the intervention. Utilization of contraceptive pills increased from 4.3% to 6.9%, injectables from 52.4% to 57.5%, implants from 12.8% to 22.9%, and IUCD from 3.2% to 5.0% after the intervention. After adjusting for the effect of possible confounding variables, screening, counseling, and referring mothers for family planning at infant immunization units significantly increases the contraceptive utilization rate among mothers presented for infant immunization services(AOR = 5.83, 95% CI: 4.02, 8.46). Screening, counseling, and referring mothers for family planning services at infant immunization units significantly increases postpartum contraceptive uptake. Integrating family planning messages with infant immunization services is recommended. Trial registration: ClinicalTrials.gov Identifier: NCT04767139 (Registered on 23/02/2021).

Australian vaccine preventable disease epidemiological review series: Hepatitis B, 2000-2019.

Hepatitis B vaccination was nationally funded for adolescents in 1996, with inclusion of universal infant immunisation under the National Immunisation Program (NIP) in May 2000. This study describes hepatitis B epidemiology in Australia in the two decades since 2000. This article analyses newly-acquired (within the prior 24 months) and unspecified (all other) hepatitis B notifications (2000-2019) from the National Notifiable Diseases Surveillance System; acute hepatitis B hospitalisations (2001-2019) from the National Hospital Morbidity Database; and acute (2000-2019) and chronic (2006-2019) hepatitis B deaths from the Australian Bureau of Statistics and Australian Coordinating Registry. Rates over the reporting period were described overall, and by age group, sex, and Aboriginal and Torres Strait Islander status (Aboriginal and/or Torres Strait Islander versus other [neither Aboriginal nor Torres Strait Islander, unknown or not stated]). Trend analyses were performed using Poisson or negative binomial regression. Additional analyses were performed for the cohort born after May 2000. The annual all-age notification rate per 100,000 per year declined (p < 0.001) from 2.13 in 2000 to 0.65 in 2019 for newly-acquired hepatitis B and from 38.3 to 22.3 for unspecified hepatitis B (likely to predominantly represent chronic hepatitis B). Newly-acquired and unspecified hepatitis B notification rates were lowest among children aged < 15 years. The most substantial reductions in notification rates of newly-acquired hepatitis B were among adolescents aged 15-19 years and young adults aged 20-24 and 25-29 years (respectively 17-, 11-, and 7-fold); these age groups also recorded the most substantial reductions in unspecified hepatitis B notifications (respectively 5-, 3.5-, and 2-fold). Newly-acquired hepatitis B notification and acute hepatitis B mortality rates were two- to threefold higher in males than females. The all-age newly-acquired hepatitis B notification rate in Aboriginal and Torres Strait Islander people decreased twofold between 2000 and 2019, but remained threefold higher than in other people. Acute hepatitis B hospitalisations also declined over the study period (p < 0.001) and followed similar patterns. There were no acute or chronic hepatitis B deaths among people born after May 2000; this cohort featured 52 newly-acquired and 887 unspecified hepatitis B notifications. Due to lack of data on country of birth (and hence eligibility for infant vaccination under the NIP or overseas programs), vaccination status and likely transmission routes, we were unable to assess factors contributing to these potentially preventable infections. Adolescent and infant immunisation under the NIP has led to significant reductions in notification rates of newly-acquired hepatitis B, and in acute hepatitis B hospitalisation rates, both overall and in Aboriginal and Torres Strait Islander people. Unspecified hepatitis B notification rates have also greatly decreased in children and young adults, likely largely due to the impact of overseas infant immunisation programs on prevalence in child and adolescent migrants. Work to improve completeness of variables within national datasets is crucial, along with enhanced surveillance of both newly-acquired and unspecified hepatitis B cases to investigate transmission routes, vaccination status and factors contributing to acquisition of hepatitis B, in order to optimise the impact of immunisation programs and ensure linkage with care.

Effect of maternal postnatal balanced energy protein supplementation and infant azithromycin on infant growth outcomes: an open-label randomized controlled trial

BackgroundMaternal undernutrition is a direct risk factor for infant growth faltering. ObjectivesWe evaluated the effect of postnatal balanced energy protein (BEP) supplementation in lactating women and azithromycin (AZ) in infants on infant growth outcomes. MethodsA randomized controlled superiority trial of lactating mother–newborn dyads was conducted in Karachi, Pakistan. Mothers intending to breastfeed their newborns with mid-upper arm circumference of <23 cm and live infants between 0 and 6 d of life were randomly assigned to 1 of 3 arms in a 1:1:1 ratio. Lactating mothers in the control arm received standard-of-care counseling on exclusive breastfeeding, nutrition, infant immunization, and health promotion plus iron-folate supplementation until the infant was 6 mo old. In intervention arm 1, mothers additionally received two 75-g sachets of BEP per day. In intervention arm 2, along with the standard-of-care and BEP to the mother, the infant also received 1 dose of azithromycin (20 mg/kg) at the age of 42 d . The primary outcome was infant length velocity at 6 mo. The total sample size was 957 (319 in each arm). ResultsFrom 1 August, 2018 to 19 May, 2020, 319 lactating mother–newborn dyads were randomly assigned in each arm, and the last follow-up was completed on 20 November, 2020. The mean difference in length velocity (cm/mo) between BEP alone and control was 0.01 (95% confidence interval [CI]: −0.03, 0.06), BEP plus AZ and control was 0.08 (95% CI: 0.03, 0.13), and between BEP + AZ and BEP alone was 0.06 (95% CI: 0.01, 0.11). There were 1.46% (14/957) infant deaths in the trial, and 17.9% (171/957) nonfatal events (injectable treatment and/or hospitalizations) were recorded. ConclusionsPostnatal maternal BEP supplementation and infant AZ administration could modestly improve infant growth outcomes at 6 mo, suggesting potential benefits in simultaneously addressing maternal and infant undernutrition.This trial was registered at clinicaltrials.gov as NCT03564652.

Inconsistent Increase in Age at Respiratory Syncytial Virus Hospitalization of Children Aged

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic disrupted respiratory syncytial virus (RSV) seasonality. To optimize the use and evaluation of RSV infant immunization strategies, monitoring changes in RSV epidemiology is essential. Hospitalizations for acute respiratory infections (ARIs) and RSV-coded ARI in children <2 years were extracted in 4 European hospitals, according to predefined case definitions (International Classification of Diseases, Tenth Revision codes). Prepandemic RSV seasons (2017-2018 to 2019-2020) were compared to 2021-2022 and 2022-2023. In 2021-2022 and 2022-2023, the peak number of RSV hospitalizations was higher than prepandemic peaks after short periods of RSV circulation, and lower than prepandemic peaks after long periods of RSV circulation. A greater proportion of RSV hospitalizations occurred in children 1 to <2 years in 2021-2022 in the Netherlands (18% vs 9%, P = .04). No increase in age was observed elsewhere. High-risk children represented a greater proportion of RSV hospitalizations during the pandemic. The proportion of pediatric intensive care unit admissions did not increase. A decrease in population immunity has been linked to older age at RSV hospitalization. We did not observe an increase in age in 3 of the 4 participating countries. Broad age categories may have prevented detecting an age shift. Monitoring RSV epidemiology is essential as Europe implements RSV immunization.

Parental knowledge and attitudes to infant immunization in the context of RSV: All about confidence?

BackgroundRecently, the first RSV vaccines have been approved, but vaccine hesitancy still poses great challenges to immunization programs. ObjectiveTo investigate this phenomenon in the context of the new RSV vaccines and an increased virus activity in 2022/23, we assessed parental knowledge and attitudes towards general childhood and RSV vaccines. MethodsParents of infants from 0-36 months completed an online questionnaire on demographics, socio-economic status, mental well-being, knowledge on RSV and perceptions of disease, attitudes to general childhood and RSV vaccines. The survey was conducted from February-June 2023 in the region of Regensburg, Germany. We compared continuous or categorical data with two-sided t-tests or Chi-square tests, respectively. Linear and logistic regression models were used to adjust for confounders. ResultsFrom 191 survey participants, 84 % had never refused any recommended vaccination and 91 % trusted their paediatrician’s information. 11 % felt that children should have fewer vaccinations or rather get over the illness. Parents who were supportive or undecided about RSV vaccination were less likely to be vaccine hesitant in general (OR 0.03, p < 0.001; OR 0.13, p = 0.003). 58 % reported to have basic or good knowledge on RSV, correlating with a higher socioeconomic index (p = 0.049). 24 % were undecided about RSV immunization, while all parents rated its benefit high in the child’s first year of life. Parents who refused RSV vaccination were less concerned about the infection compared to vaccine supporters (OR 0.44, p < 0.001). Parents with previously hospitalized (OR 3.88, p = 0.017) or preterm born children (OR 5.12, p = 0.026) were generally more concerned. ConclusionMany factors influence parental decision-making leading to three main groups of attitudes: vaccine acceptors, refusers and hesitant but accessible parents. They (24%) represent the “target group” to increase vaccine uptake. Information on the vaccine-preventable disease reduces vaccine hesitancy, underlining the importance of healthcare professionals who remain an important source of trust.