Haemophilus influenzae type b vaccination and anthropometric, cognitive, and schooling outcomes among Indian children

Analysis of anthropometric outcomes in Indian children during the COVID-19 pandemic using National Family Health Survey data

BACKGROUND

Disruptions in food, health, and economic systems during the COVID-19 pandemic may have adversely affected child health. There is currently limited research on the potential effects of the COVID-19 pandemic on stunting, wasting, and underweight status of young children.

METHODS

We examine the short-term associations between the pandemic and anthropometric outcomes of under-5 children (n = 232,920) in India, using data from the National Family Health Survey (2019-2021). Children surveyed after March 2020 are considered as the post-COVID group, while those surveyed earlier are considered as pre-COVID. Potential biases arising from differences in socioeconomic characteristics of the two groups are mitigated using propensity score matching methods.

RESULTS

Post-COVID children surveyed in 2020 and 2021 have 1.2% higher underweight rates, 1.2% lower wasting rates, 0.1 lower height-for-age z-scores (HAZ), and 0.04 lower weight-for-height z-scores as compared with matched pre-COVID children. Post-COVID children surveyed in 2020 have 1.6%, 4.6%, and 2.4% higher stunting, underweight, and wasting rates, respectively, and 0.07 lower HAZ, as compared with matched pre-COVID children. Reductions in nutritional status are largest among children from households in the poorest wealth quintiles.

CONCLUSIONS

These findings indicate a trend towards a recovery in child anthropometric outcomes in 2021 after the initial post-pandemic reductions. The resilience of health and food systems to shocks such as COVID-19 should be strengthened while immediate investments are required to decrease child malnutrition and improve broader child health outcomes.

Investing in school systems: conceptualising returns on investment across the health, education and social protection sectors

Public policies often aim to improve welfare, economic injustice and reduce inequality, particularly in the social protection, labour, health and education sectors. While these policies frequently operate in silos, the education sphere can operate as a cross-sectoral link. Schools represent a unique locus, with globally hundreds of millions of children attending class every day. A high-profile policy example is school feeding, with over 400 million students worldwide receiving meals in schools. The benefits of harmonising interventions across sectors with a common delivery platform include economies of scale. Moreover, economic evaluation frameworks commonly used to assess policies rarely account for impact across sectors besides their primary intent. For example, school meals are often evaluated for their impact on nutrition, but they also have educational benefits, including increasing attendance and learning and incorporating smallholder farmers into corporate value chains. To address these gaps, we propose the introduction of a comprehensive value-for-money framework for investments toward school systems that acknowledges the return to a common delivery platform-schools-and the multisectoral returns (eg, education, health and nutrition, labour, social protection) emerging from the rollout of school-based programmes. Directly building on benefit-cost analysis methods, this framework could help identify interventions that yield the highest gains in human capital per budget expenditure, with direct implications for finance ministries. Given the detrimental impact of COVID-19 on schoolchildren and human capital, it is urgent to build back stronger and more sustainable welfare systems.

Caregiver perceptions of the broader societal benefits of vaccination: A path toward sustainable vaccine advocacy in India

Over the last decade growing public health evidence suggests that, in addition to health-related benefits, there are also social and economic benefits of vaccination. Research to understand how caregivers in low-and-middle-income countries perceive these social and economic benefits, or if these benefits factor into their vaccination decisions for their children, has been limited. Leveraging qualitative strategies to gain more nuanced insights into caregiver perceptions of vaccination benefits has also been significantly underexplored. We conducted in-depth interviews with 13 caregivers of children, at which point we reached saturation, in Mewat District, Haryana, an area in India with low vaccination coverage. Interview results suggest that caregivers of children associate positive health outcomes with vaccination programs, and some additional social and economic benefits beyond improved health outcomes. Caregivers also shared how local advocacy and gaps in vaccination programs can affect their perceptions of vaccination benefits. Qualitatively exploring the perceived benefits provides a unique understanding of the value that caregivers assign to vaccination and complements existing knowledge on factors that dissuade caregivers from vaccination. These insights will allow researchers to better identify and design context-specific advocacy strategies to strengthen vaccination programs in communities with low vaccine uptake and acceptance.

Community perceptions of vaccination among influential stakeholders: qualitative research in rural India

Background

In India and other low- and middle-income countries, multiple family and community members are influential in caregivers’ perceptions of vaccination. Existing literature indicates the primary caregiver, typically the mother, is instrumental in vaccine decision-making, but this may vary in contexts. We investigated the role of stakeholders in India who influence caregivers’ vaccination perceptions, as this is essential to developing strategies to promote vaccine acceptance and improve uptake.

Methods

This research was conducted in 2019 in Mewat District in Haryana, an area in India with extremely low vaccination coverage. We conducted six focus group discussions with 60 participants in the following categories: fathers of children under-5 years old, expectant mothers, mothers-in-law, community health workers, and community influencers such as locally elected officials and religious leaders.

Results

Our results highlighted four themes that influence vaccine uptake. First, while caregivers associated vaccination with reductions in specific diseases, they also noted that vaccination services brought broad health gains, including improved nutrition, antenatal guidance, and social support. Second, community health workers critically influenced, positively or negatively, caregivers’ vaccination perceptions. Third, community health workers faced gaps in their education such as limited training on vaccine side-effects, placing them at a disadvantage when dealing with families. Finally, we found that mothers-in-law, fathers, and religious leaders influence caregivers’ perceptions of vaccination.

Conclusions

Communication of broader benefits of vaccines and vaccination services by community health workers could be impactful in increasing vaccine acceptance. Vaccine uptake could potentially be improved by facilitating community health workers’ ownership over vaccine acceptance and uptake by involving them in the design and implementation of interventions to target mothers and mothers-in-law. A ‘bottom-up’ approach, leveraging community health workers’ knowledge to design interventions, and giving a voice to key members of the household and society beyond mothers alone, may sustain health improvement in low vaccine coverage areas.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12889-021-12188-4.

Does support to Private Health Practitioners increase childhood vaccination coverage? Findings from a comparative study in Afghanistan

INTRODUCTION

In Afghanistan coverage of childhood vaccinations is very low, especially in remote and insecure areas with a weak public health structure. Private health providers (PHPs) in these areas play an important role in health care provision, some of whom have received (para)medical training. In 2009 HealthNet TPO initiated a Public-Private Partnership program in Uruzgan province, training and equipping 34 PHPs in remote and conflict-affected locations to provide quality childhood vaccination services. We aimed to assess the impact of this program on child vaccination coverage.

METHODS

A cross-sectional household survey was performed in three districts of Uruzgan Province from January through April 2013. A stratified cluster sampling approach was used to select villages; in each of the villages 15 households were randomly selected. Vaccination information, based on vaccination cards and mother's recall, was obtained about all children aged 12-23 months in these households.

RESULTS

In total 113 children from 8 PHP villages and 286 children from 18 non-PHP villages were included. A clustered analysis showed that coverage of polio-3, diphtheria-tetanus-pertussis (DTP)-3 and of measles-1 were significantly higher in PHP villages (73.5%, 66.4% and 69.9% respectively) than in non-PHP villages (36.0%, 5.2% and 26.2% respectively; P < 0.0001 for all comparisons). The proportion of children being fully vaccinated (excluding BCG) was 54.9% in the PHP villages and 4.9% in the non-PHP villages (P < 0.0001). Vaccinated children in non-PHP villages were mainly vaccinated during mass vaccination campaigns (92.5%), while in PHP villages this was done by PHPs (47.2%) or a combination of PHPs and mass vaccination campaigns (39.2%).

CONCLUSION

Our study shows that PHPs in remote and conflict affected locations in Afghanistan can play an important role to increase childhood vaccination coverage. Expanding this program to comparable provinces in Afghanistan and to other countries struggling with insecurity and weak public health systems may save much childhood morbidity and mortality.

Improving vaccination coverage and timeliness through periodic intensification of routine immunization: evidence from Mission Indradhanush

Only an estimated 62% of Indian children under the age of 2 years are fully immunized. We examined the association between India's Mission Indradhanush (MI)-a periodic intensification of the routine immunization program-which was implemented in phases across districts between March 2015 and July 2017, and routine vaccination coverage and timeliness among children. We used data from a 2015 to 2016 national survey of children (n = 29,532) and employed difference-in-difference regressions to examine binary indicators of receipt of 11 vaccines and whether vaccines were received at recommended ages. The full immunization rate was 27% higher among children under 2 years old residing in MI phase 1 and 2 districts (intervention group) as compared with those residing elsewhere (control group). The rate of receiving all vaccines at recommended ages was 8% higher in the intervention group. Receiving doses of oral polio vaccine (OPV) birth dose, OPV dose 1 (OPV1), OPV2, OPV3, bacillus Calmette-Guérin, and hepatitis B birth dose vaccines were 9%, 9%, 11%, 16%, 5%, and 19% higher in the intervention group than the control group, respectively. More research is required on the cost-effectiveness of investing in MI-type programs as compared with routine immunization.

Monetary Valuation of Children's Cognitive Outcomes in Economic Evaluations from a Societal Perspective: A Review

Cognitive ability in childhood is positively associated with economic productivity in adulthood. Expected gains in economic output from interventions that protect cognitive function can be incorporated in benefit-cost and cost-effectiveness analyses conducted from a societal perspective. This review summarizes estimates from high-income countries of the association of general cognitive ability, standardized as intelligence quotient (IQ), with annual and lifetime earnings among adults. Estimates of the association of adult earnings with cognitive ability assessed in childhood or adolescence vary from 0.5% to 2.5% per IQ point. That range reflects differences in data sources and analytic methods. We take a conservative published estimate of a 1.4% difference in market productivity per IQ point in the United States from a recent study that controlled for confounding by family background and behavioral attributes. Using that estimate and the present value of lifetime earnings calculated using a 3% discount rate, the implied lifetime monetary valuation of an IQ point in the United States is USD 10,600-13,100. Despite uncertainty and the exclusion of non-market productivity, incorporation of such estimates could lead to a fuller assessment of the benefits of public health and clinical interventions that protect the developing brains of fetuses, infants, and young children.

Associations between private vaccine and antimicrobial consumption across Indian states, 2009-2017

Vaccines can reduce antibiotic use and, consequently, antimicrobial resistance by averting vaccine-preventable and secondary infections. We estimated the associations between private vaccine and antibiotic consumption across Indian states during 2009-2017 using monthly and annual consumption data from IQVIA and employed fixed-effects regression and the Arellano-Bond Generalized Method of Moments (GMM) model for panel data regression, which controlled for income and public sector vaccine use indicators obtained from other sources. In the annual data fixed-effects model, a 1% increase in private vaccine consumption per 1000 under-5 children was associated with a 0.22% increase in antibiotic consumption per 1000 people (P < 0.001). In the annual data GMM model, a 1% increase in private vaccine consumption per 1000 under-5 children was associated with a 0.2% increase in private antibiotic consumption (P < 0.001). In the monthly data GMM model, private vaccine consumption was negatively associated with antibiotic consumption when 32, 34, 35, and 44-47 months had elapsed after vaccine consumption, with a positive association with lags of fewer than 18 months. These results indicate vaccine-induced longer-term reductions in antibiotic use in India, similar to findings of studies from other low- and middle-income countries.

Association of basic vaccination with cognitive and learning ability among children: insights from the India Human Development Survey, 2004-05 and 2011-12

Basic vaccination is important to protect children from infectious diseases and illnesses. Adequate levels of vaccination coverage reduce the morbidity and mortality burden among children and promote their physical and mental development. This study aimed to assess the association between basic childhood vaccination and the cognitive and learning ability of school children in India. Nationally representative follow-up data on 6183 children from the Indian Human Development Surveys conducted in 2004-05 and 2011-12 (IHDS I & II) were analysed. Children aged 8-10 years who had received all basic vaccines by the age 12 months performed better in a maths test than partially vaccinated or unvaccinated children (OR: 1.87, 95% CI: 1.48, 2.35). Similarly, fully vaccinated children performed better in writing tasks than partially vaccinated or unvaccinated children (OR: 1.77, 95% CI: 1.44, 2.18). Likewise, fully vaccinated children had better reading skills than fully unvaccinated children (OR: 1.60, 95% CI: 1.23, 2.09). The results suggest that enhancing child vaccination coverage can have significant benefits beyond health and can potentially improve the long-term educational outcomes of children.

A systematic literature review on the prevalence and etiology of meningitis among critically ill and hospitalized patients in India

BACKGROUND

In India, owing to multiple factors, such as insufficient laboratory capacity, poor reporting systems due to limited access to healthcare facilities and limited disease surveillance programmes, the actual disease burden of meningitis is unknown and may be largely under-reported.

OBJECTIVE

A systematic literature review was performed to describe: (a) the prevalence of meningitis; and (b) its etiological pathogen across different regions, age groups and patients with comorbidities.

METHOD

A systematic literature search was conducted between 1990 and 2020 using PubMed and Google Scholar databases to identify Indian studies reporting the prevalence rates and etiology of meningitis. A total of 51 studies were included in the final analysis.

RESULTS

A total of 38 studies reported prevalence of meningitis and 21 studies reported data on the etiology of meningitis in India. These studies included mixed patient populations: (a) pyogenic meningitis; (b) meningitis in sick or hospitalized patients with tuberculosis, acute febrile encephalopathy syndrome, septicaemia, invasive pneumococcal disease or respiratory compromise; and (c) meningitis patients with comorbidities. The prevalence of confirmed bacterial meningitis in the pediatric population (0-14 years) ranged between 0.5% and 61.8%. A total of seven studies reported the prevalence of meningitis in patients of all age groups (0-75 years), with prevalence ranging between 8.68% and 78.85%. Cryptococcal meningitis was predominant in patients with positive HIV/AIDS, with a prevalence ranging between 2.09% and 53.1%. Streptococcus pneumoniae was found to be the predominant pathogen causing meningitis across different regions of India, with a frequency ranging from 4% to 61.8% in patients of all age groups.

CONCLUSION

This systematic literature review displayed the possible range of frequency of bacterial meningitis pathogens across a wide variety of age groups in different regions of India. Further studies are warranted to monitor meningitis cases, which may facilitate the development of prevention and treatment strategies in India.

Effect of vaccination on children’s learning achievements: findings from the India Human Development Survey

Background

Beyond the prevention of illness and death, vaccination may provide additional benefits such as improved educational outcomes. However, there is currently little evidence on this question. Our objective was to estimate the effect of childhood vaccination on learning achievements among primary school children in India.

Methods

We used cohort data from the India Human Development Survey. Vaccination status and confounders were measured among children who were at least 12 months old at baseline in 2004–2005. In 2011–2012, the same children completed basic reading, writing and math tests. We estimated the effect of full vaccination during childhood on learning achievements using inverse probability of treatment-weighted logistic regression models and results reported on the risk difference scale. The propensity score included 33 potential community-, household-, mother- and child-level confounders as well as state fixed effects.

Results

Among the 4877 children included in our analysis, 54% were fully vaccinated at baseline, and 54% could read by the age of 8–11 years. The estimated effect of full vaccination on learning achievements ranged from 4 to 6 percentage points, representing relative increases ranging from 6% to 12%. Bias analysis suggested that our observed effects could be explained by unmeasured confounding, but only in the case of strong associations with the treatment and outcome.

Conclusion

These results support the hypothesis that vaccination has lasting effects on children’s learning achievements. Further work is needed to confirm findings and elucidate the potential mechanisms linking vaccines to educational outcomes.

Childhood vaccinations and adult schooling attainment: Long-term evidence from India's Universal Immunization Programme

Routine childhood vaccines are among the most cost-effective life-saving interventions. In addition, vaccines have been linked with reduced stunting and improved health and other outcomes in later life. However, evidence on such long-term benefits remain inadequate. In this study, we examined the associations between the initiation and implementation of the Universal Immunization Programme (UIP) in India and schooling attainment among adults. We obtained district-level data on the rollout of the UIP in 1985-1990 and matched those with data from the National Family Health Survey of India, 2015-2016. Adults who were born in the five years before and after the rollout period (1980-1995) and always lived in the same location were included in the analysis (n=109,908). We employed household, village or city ward, district, and state fixed-effects linear regression models, which incorporated a wide range of socioeconomic and demographic indicators and community-level infrastructure, amenities, and access to healthcare. We compared schooling attainment in years among individuals who were born during or after the UIP was implemented in their districts (intervention group) with those who were born before UIP implementation (control group). In household fixed-effects analysis, intervention group adults attained 0.18 (95% confidence interval [CI]: 0.02, 0.33; p<0.05) more schooling grades as compared with control group adults from the same household. In village or city ward, district, and state fixed-effects analysis, intervention group adults attained 0.23 (95% CI: 0.13, 0.32; p<0.001), 0.29 (95% CI: 0.19, 0.38; p<0.001), and 0.25 (95% CI: 0.1, 0.39; p<0.01) additional schooling grades, respectively, compared to the control group. In subgroup analyses, positive associations between UIP implementation and schooling grades were observed among women and among rural, urban, and richer households. Our results support the association of vaccines with improved school attainment.

Why vaccines matter: understanding the broader health, economic, and child development benefits of routine vaccination

The direct benefits of childhood vaccination in reducing the burden of disease morbidity and mortality in a cost-effective manner are well-established. By preventing episodes of vaccine-preventable diseases, vaccination can also help avert associated out-of-pocket medical expenses, healthcare provider costs, and losses in wages of patients and caregivers. Studies have associated vaccines positively with cognition and school attainment, suggesting benefits of long-term improved economic productivity. New evidence suggests that the measles vaccine may improve immunological memory and prevent co-infections, thereby forming a protective shield against other infections, and consequently improving health, cognition, schooling and productivity outcomes well into the adolescence and adulthood in low-income settings. Systematically documenting these broader health, economic, and child development benefits of vaccines is important from a policy perspective, not only in low and middle-income countries where the burden of vaccine-preventable diseases is high and public resources are constrained, but also in high-income settings where the emergence of vaccine hesitancy poses a threat to benefits gained from reducing vaccine-preventable diseases. In this paper, we provide a brief summary of the recent evidence on the benefits of vaccines, and discuss the policy implications of these findings.

Anthropometric, cognitive, and schooling benefits of measles vaccination: Longitudinal cohort analysis in Ethiopia, India, and Vietnam

OBJECTIVE

To estimate the associations between measles vaccination and child anthropometry, cognition, and schooling outcomes in Ethiopia, India, and Vietnam.

METHODS

Longitudinal survey data from Young Lives were used to compare outcomes at ages 7-8 and 11-12 years between children who reported receipt or non-receipt of measles vaccine at 6-18 months-of-life (n = ∼2000/country). Z-scores of height-for-age (HAZ), BMI-for-age (BMIZ), weight-for-age (WAZ), Peabody Picture Vocabulary Test (PPVT), early grade reading assessment (EGRA), language and mathematics tests, and attained schooling grade were examined. Propensity score matching was used to control for systematic differences between measles-vaccinated and measles-unvaccinated children.

FINDINGS

Using age- and country-matched measles-unvaccinated children as comparisons, measles-vaccinated children had better anthropometrics, cognition, and schooling. Measles-vaccinated children had 0.1 higher HAZ in India and 0.2 higher BMIZ and WAZ in Vietnam at age 7-8 years, and 0.2 higher BMIZ at age 11-12 years in Vietnam. At ages 7-8 years, they scored 4.5 and 2.9 percentage points (pp) more on PPVT and mathematics, and 2.3 points more on EGRA in Ethiopia, 2.5 points more on EGRA in India, and 2.6 pp, 4 pp, and 2.7 points more respectively on PPVT, mathematics, and EGRA in Vietnam. At ages 11-12 years, they scored 3 pp more on English and PPVT in India, and 1.7 pp more on PPVT in Vietnam. They also attained 0.2-0.3 additional schooling grades across all ages and countries.

CONCLUSION

Our findings suggest that measles vaccination may have benefits on cognitive gains and school-grade attainment that can have broad educational and economic consequences which extend beyond early childhood.