Persistent Ascaris Transmission Is Possible in Urban Areas Even Where Sanitation Coverage Is High

Child feces disposal practices in humanitarian and non-humanitarian settings across 34 low- and middle-income countries

Globally, safe sanitation has improved significantly in the last two decades, but unsafe child feces disposal remains a growing challenge in many regions, exposing household members and communities to infectious pathogens. The drivers associated with child feces disposal in several contexts including humanitarian settings are not well understood. This study investigated child feces disposal (CFD) practices and associated factors in low- and middle-income countries, including in humanitarian settings. Data from 352,173 women in 34 countries, collected between 2012 and 2021 through Demographic and Health Surveys (DHS), were used. We utilized multivariate logistic regression to assess CFD practices among children under two years old and the factors linked to these practices. We incorporated data from the United Nations High Commissioner for Refugees (UNHCR) regarding refugee camps' locations in the analysis. Time series and local spatial autocorrelation analyses were run to examine changes in safe CFD practices over time and space, respectively. Results showed minimal improvement in safe child feces disposal over the past decade, with 55.6 % of respondents in non-humanitarian settings and 38.1 % in humanitarian settings improperly disposing of feces. Improper CFD significantly correlated with increased odds of diarrhea in non-humanitarian settings (OR 1.09 95 % CI: 1.05-1.13) but not in humanitarian settings (OR 1.14 95 % CI: 0.53-2.49). The most significant factors (p < 0.05) associated with safe CFD included being in the richest wealth quintile (OR 3.27 95 % CI: 3.06-3.49), having basic education (OR 1.28 95 % CI: 1.22-1.33), children eating solid food (OR 1.53 95 % CI: 1.48-1.57), improved sanitation access (OR 1.88 95 % CI: 1.81-1.96), and listening to radio at least weekly (OR 1.40 95 % CI: 135-1.46). Policymakers and development partners must include safe CFD guidelines in national policies and programs, as well as prioritize investments in household-level sanitation and educate caregivers about safe CFD practices.

Determination of the Prevalence of Ascaris lumbricoides in Children under the Age of Five Years Attending at Kongowe Health Centre, Kibaha District, Pwani Region

Background

The worldwide distribution and occurrence show that more than 1.8 billion people, accounting for 28% of the global population, are infected with A. lumbricoides infection due to poor hygiene. The World Health Organization aims to eliminate morbidity from A. lumbricoides infection in children by 2030 by at least 75%. Surveys in the Pwani Region of Tanzania have shown poor hygienic risk factors due to high population and lack of sufficient toilets/latrines, poor sewage waste disposal, and insufficient clean drinking water that encourages the reproduction, transmission, and reinfection of A. lumbricoides. No study has been conducted in Pwani Region to determine the extent of A. lumbricoides infection among the population. This research tends to explore more about the status of A. lumbricoides infection in Kibaha District in the Pwani Region, Tanzania.

Methods

A cross-sectional study was done on 400 children (170 males and 230 females) who were under the age of 5 years old at Kongowe Health Centre. Collected data for A. lumbricoides infection measured were analyzed using Microsoft Excel, while data for sociodemographic findings and risk assessment were subjected to bivariate and multivariable analysis using Statistical Package for Social Sciences version 28.0.1.0 software (SPSS Inc., USA) at the level of significance of P < 0.05.

Results

Of the 400 children who participated in the laboratory testing of A. lumbricoides infection, 194 were found positive for A. lumbricoides infection. Amongst the 194 children who were found to be positive, 4.1%, 38.7%, and 57.2% were found to be in the age group of below 1 year old, 1 to 2, and 3 to 4 years old, respectively. The tabulated responses on the social demographic responses showed that 81.8% of the responses at P = 0.041 and 80.6% at P = 0.101 knew that A. lumbricoides infection is acquired from faeces and uncooked food, respectively, as 61.8% at P = 0.132 and 63.2% at P = 0.085 respondents did not accept that soil and dirty water, respectively, were not sources of A. lumbricoides infection. At P = 0.612 and P = 0.022, 64% and 91.2% of the respondents showed the importance of using latrines/toilets and washing fruits, respectively. Further results showed that 69.8% and 37.6% of the respondents reacted with no importance of washing hands with soap after using a toilet/latrine and no need to treat or boil water before drinking, respectively.

Conclusions

A. lumbricoides infection has a high prevalence in infants of the Kibaha District of Tanzania, especially in Kongowe village. The infection is dominant in males compared to female children. The prevalence is due to risk factors such as inadequate sanitation, low level of education, knowledge, and awareness of prevention strategies.

Improved Child Feces Management Mediates Reductions in Childhood Diarrhea from an On-Site Sanitation Intervention: Causal Mediation Analysis of a Cluster-Randomized Trial in Rural Bangladesh

BACKGROUND

The WASH benefits Bangladesh trial multi-component sanitation intervention reduced diarrheal disease among children < 5 years. Intervention components included latrine upgrades, child feces management tools, and behavioral promotion. It remains unclear which components most impacted diarrhea.

METHODS

We conducted mediation analysis within a subset of households (n = 720) from the sanitation and control arms. Potential mediators were categorized into indicators of latrine quality, latrine use practices, and feces management practices. We estimated average causal mediation effects (ACME) as prevalence differences (PD), defined as the intervention's effect on diarrhea through its effect on the mediator.

RESULTS

The intervention improved all indicators compared to controls. We found significant mediation through multiple latrine use and feces management practice indicators. The strongest mediators during monsoon seasons were reduced open defecation among children aged < 3 and 3-8 years, and increased disposal of child feces into latrines. The strongest mediators during dry seasons were access to a flush/pour-flush latrine, reduced open defecation among children aged 3-8 years, and increased disposal of child feces into latrines. Individual mediation effects were small (PD = 0.5-2 percentage points) compared to the overall intervention effect but collectively describe significant mediation pathways.

DISCUSSION

The effect of the WASH Benefits Bangladesh sanitation intervention on diarrheal disease was mediated through improved child feces management and reduced child open defecation. Although the intervention significantly improved latrine quality, relatively high latrine quality at baseline may have limited benefits from additional improvements. Targeting safe child feces management may increase the health benefits of rural sanitation interventions.

Sanitation in urban areas may limit the spread of antimicrobial resistance via flies

Synanthropic filth flies are common where sanitation is poor and fecal wastes are accessible to them. These flies have been proposed as mechanical vectors for the localized transport of fecal microbes including antimicrobial resistant (AMR) organisms and associated antimicrobial resistance genes (ARGs), increasing exposure risks. We evaluated whether an onsite sanitation intervention in Maputo, Mozambique reduced the concentration of enteric bacteria and the frequency of detection of ARGs carried by flies collected in household compounds of low-income neighborhoods. Additionally, we assessed the phenotypic resistance profile of Enterobacteriaceae isolates recovered from flies during the pre-intervention phase. After fly enumeration at study compounds, quantitative polymerase chain reaction was used to quantify an enteric 16S rRNA gene (i.e., specific to a cluster of phylotypes corresponding to 5% of the human fecal microflora), 28 ARGs, and Kirby Bauer Disk Diffusion of Enterobacteriaceae isolates was utilized to assess resistance to eleven clinically relevant antibiotics. The intervention was associated with a 1.5 log10 reduction (95% confidence interval: -0.73, -2.3) in the concentration of the enteric 16S gene and a 31% reduction (adjusted prevalence ratio = 0.69, [0.52, 0.92]) in the mean number of ARGs per fly compared to a control group with poor sanitation. This protective effect was consistent across the six ARG classes that we detected. Enterobacteriaceae isolates-only from the pre-intervention phase-were resistant to a mean of 3.4 antibiotics out of the eleven assessed. Improving onsite sanitation infrastructure in low-income informal settlements may help reduce fly-mediated transmission of enteric bacteria and the ARGs carried by them.

Factors associated with rural-urban safe disposal of children stools in Ghana

INTRODUCTION

The burden of children's disease in many low-and middle-income countries is associated with poor sanitation, including unsafe disposal of children's stool. Infants and toddler stools pose a greater public health risk than adults. Studies on stool disposal in Sub-Saharan Africa (SSA) and Ghana have focused on prevalence, patterns, and associated factors. Nevertheless, these studies have not focused on factors that independently influence rural and/or urban child stool disposal. This study, therefore, examines factors associated with safe child stool disposal in rural areas separately from urban areas towards Ghana's readiness for ending open defaecation by 2030.

METHODOLOGY

We examined young children's faecal disposal drawing on the sixth round of the nationally-representative Ghana Multiple Indicator Cluster Survey (MICS) conducted in 2017/18. This study was restricted to children under two years, yielding a sub-sample of 3,476. Responses of caregivers or mothers who disposed of children less than two years faecal matter, their characteristics in addition to the child's age in months were analysed. A binary logistic regression was used to examine the factors associated with the safe disposal of young children's stools.

RESULTS

In the aggregated data, only 22% of households, regardless of their residence, dispose of their young children less than two years stools safely. From the disaggregated data, the rural analysis shows that 26% of young children's stools were safely disposed of, compared to 16% in the urban analysis. The urban analysis shows that the child's age, sex and caregiver's marital status were significantly associated with safe disposal of stools. On the other hand, child's age, caregiver listening to radio and household access to improved toilet facilities were significant in the rural analysis.

CONCLUSION

The safe practice of stool disposal was very low. The results of this study show that urgent and different policies and strategies are needed to address child stool disposal in urban residences compared to rural residences if we are to meet SDG targets of ending open defaecation.

Multiscalar Evaluation of the Water Distribution System and Diarrheal Disease Risk in Addis Ababa, Ethiopia

Despite growing urbanization, our understanding of the impacts of water and sanitation on human health has largely come from studies in rural sectors. To this end, we collected data at both regional (water quality measures from water treatment systems) and community (cross-sectional surveys) scales to examine determinants of enteric pathogen infection and diarrheal disease among infants in Addis Ababa, Ethiopia. Regionally, the Legedadi water treatment plant had significantly lower heterotrophic plate counts, total coliform counts, and fecal coliform counts compared with the Gefersa water treatment plant. The number of pathogen types in infant stool also differed by plant. Decreases in chlorine levels and increases in the relative abundance of Gammaproteobacteria with distance from treatment plants suggest a compromised water distribution system. In communities, infants in households that obtained water from yard pipes or public taps had significantly lower odds of diarrhea compared to households that had water piped into their dwellings (OR = 0.35, 95% CI 0.16, 0.76, and OR = 0.39, 95% CI 0.15, 1.00, respectively). Similarly, infants in households that boiled or filtered water had significantly lower odds of diarrhea compared to households that did not treat water (OR = 0.40, 95% CI 0.19, 0.86 and OR = 0.23, 95% CI 0.06, 0.84, respectively). Integrating multiscalar data better informs the health impacts of water in urban settings.

Assessing sustained uptake of latrine and child feces management interventions: Extended follow-up of a cluster-randomized controlled trial in rural Bangladesh 1-3.5 years after intervention initiation

BACKGROUND

Sanitation interventions typically result in modest increases in latrine access, and any gains in latrine access and use are often not sustained over time. Sanitation programs also rarely include child-focused interventions such as potties. We aimed to assess the sustained effect of a multi-component sanitation intervention on access to and use of latrines and child feces management tools in rural Bangladesh.

METHODS

We conducted a longitudinal substudy nested within the WASH Benefits randomized controlled trial. The trial provided latrine upgrades, child potties and sani-scoops for feces removal, along with behavior change promotion to encourage use of the delivered hardware. Promotion visits to intervention recipients were frequent during the first 2 years after intervention initiation, decreased in frequency between years 2-3, and ceased after 3 years. We enrolled a random subset of 720 households from the sanitation and control arms of the trial in a substudy and visited them quarterly between 1 and 3.5 years after intervention initiation. At each visit, field staff recorded sanitation-related behaviors through spot-check observations and structured questionnaires. We assessed intervention effects on observed indicators of hygienic latrine access, potty use and sani-scoop use and investigated whether these effects were modified by duration of follow-up, ongoing behavior change promotion and household characteristics.

RESULTS

The intervention increased hygienic latrine access from 37% among controls to 94% in the sanitation arm (p < 0.001). Access among intervention recipients remained high 3.5 years after intervention initiation, including periods with no active promotion. Gains in access were higher among households with less education, less wealth and larger number of residents. The intervention increased availability of child potties from 29% among controls to 98% in the sanitation arm (p < 0.001). However, fewer than 25% of intervention households reported exclusive child defecation in a potty or had observed indicators of potty and sani-scoop use, and gains in potty use declined over the follow-up period, even with ongoing promotion.

CONCLUSION

Our findings from an intervention that provided free products and intensive initial behavior change promotion suggest a sustained increase in hygienic latrine access up to 3.5 years after intervention initiation but infrequent use of child feces management tools. Studies should investigate strategies to ensure sustained adoption of safe child feces management practices.

Effect of Turning Frequency on the Survival of Fecal Indicator Microorganisms during Aerobic Composting of Fecal Sludge with Sawdust

The study investigated the effect of turning frequency on survival of fecal indicator pathogens (E. coli, Enterococcus spp., Salmonella spp. and helminth eggs) during fecal sludge (FS) co-composting with sawdust. Dewatered FS was mixed with sawdust and composted on a pilot scale using different turning frequencies-i.e., 3 days (3TF), 7 days (7TF), and 14 days (14TF). Composting piles were monitored weekly for survival of fecal indicator microorganisms and evolution of selected physical and chemical characteristics for 14 weeks. Our results show that turning frequency has a statistically significant (p < 0.05) effect on pathogen inactivation in FS compost. The 3TF piles exhibited shorter pathogen inactivation periods (8 weeks) than 7TF and 14TF piles (10 weeks). Temperature-time was found to be the major factor responsible for the survival of pathogens in FS composting piles, followed by indigenous microbial activities and toxic by-products (monitored as NH₄⁺-N). Our study findings suggest that even at low composting temperatures, the high turning frequency can enhance pathogen inactivation. This is a significant finding for composting activities in some rural areas where suitable organic solid waste for co-composting with FS to attain the recommended high thermophilic conditions could be greatly lacking.