Heavy metal analysis of drinking water supply, wastewater management, and human health risk assessment across secondary schools in Badagry coastal community, Lagos State, Nigeria

Malaria and typhoid fever co-infection: a retrospective analysis of University Hospital records in Nigeria

BACKGROUND

Studies have long documented the presence of malaria and typhoid fever in sub-Saharan Africa (SSA). However, studies on these diseases have primarily concentrated on rural settings, neglecting the potential impact on urban areas. This knowledge gap hinders effective surveillance and intervention strategies. To bridge this gap, this study investigated the prevalence of malaria and typhoid co-infections in an urban environment.

METHODS

This study, conducted at Lead City University Hospital in Ibadan, Nigeria (West Africa's largest metropolis), analysed medical records of over 3195 patients seen between April and June 2023. Descriptive statistics and chi-square tests were used to understand how these co-infections were distributed across different age and gender groups.

RESULTS

The prevalence of co-infection peaked in May (9.7%), followed by June (8.9%) and April (5.7%). Notably, children aged 6-12 years exhibited the highest co-infection rate (18.5%), while those under five had the lowest (6.3%). Gender analysis indicated a slight difference, with 8.8% of females and 7.1% of males co-infected. Malaria prevalence was highest at the beginning of the rainy season and significantly decreased over time. Conversely, typhoid fever displayed the opposite trend, increasing with the rainy season. Children under five years old were most susceptible to malaria, while typhoid fever predominantly affected adults over 25 years old, with prevalence decreasing significantly with age.

CONCLUSION

This study sheds light on the previously overlooked risk of malaria and typhoid co-infections in urban settings. These findings highlight the need for enhanced surveillance and targeted public health interventions, particularly for vulnerable groups like young children during peak transmission seasons.

Wastewater-based epidemiology for comprehensive communitywide exposome surveillance: A gradient of metals exposure

Community wastewater surveillance is an established means to measure health threats. Exposure to toxic metals as one of the key environmental contaminants has been attracting public health attention as exposure can be related to contamination across air, water, and soil as well as associated with individual factors. This research uses Jefferson County, Kentucky, as an urban exposome case study to analyze sub-county metal concentrations in wastewater as a possible indicator of community toxicant exposure risk, and to test the feasibility of using wastewater to identify potential community areas of elevated metals exposure. Variability in wastewater metal concentrations were observed across the county; 19 of the 26 sites had one or more metal results greater than one standard deviation above the mean and were designated areas of concern. Additionally, thirteen of the nineteen sites were of increased concern with levels greater than two standard deviations above the mean. This foundational research found variability in several instances between smaller nested upstream contributing neighborhood sewersheds when measured in the associated downstream treatment plant. Wastewater provides an opportunity to look at integrated toxicology to complement other toxicology data, looking at where people live and what toxicants need to be focused on to protect the health of people in that area.

Prevalence and spatiotemporal distribution of rotavirus diarrhea among children younger than five years old in Lagos, Nigeria

Data on spatiotemporal distribution of rotavirus diarrhea are limited in many endemic settings. This study determined the prevalence and seasonal distribution of rotavirus among Nigerian children with diarrhea. Here, a total of 406 fecal samples were collected from patients attending six health facilities in Lagos between January - December 2019. Socio-demographic data of each enrolled child were collected. Rotavirus VP6 antigen was detected by enzyme-linked immunoassay (ELISA) and confirmation by VP7 gene detection by reverse transcription polymerase-chain reaction. The overall rotavirus diarrhea prevalence was 16.3% by ELISA with children above 2 years having 29.2% of this prevalence and higher occurrence in females (59.1%) than males (40.9%) (P < .05). Rotavirus diarrhea diagnosis using RT-PCR showed 100% concordance with ELISA. Cases of rotavirus diarrhea were detected from March to July and from September to November with the highest number of cases detected in May and June (22.7% each), followed by July (21.2%). The prevalence of rotavirus diarrhea remains high in Lagos with an emerging higher disease activity in children above 2. A different rotavirus transmission dynamics compared to previous studies from Nigeria and other African countries was found. VP6 ELISA may reliably be used for continuous rotavirus surveillance in Nigeria.

Menstrual Hygiene Management Inequalities among School Girls in Badagry, Nigeria

OBJECTIVES

The study assessed menstrual hygiene management (MHM) inequalities among public and private in-school adolescents in Badagry, southwest Nigeria. Also assessed was the impact of available water, sanitation, and hygiene (WASH) facilities on MHM within the school premises.

METHODS

For this descriptive, cross-sectional study 420 students were selected via multi-stage sampling and data were obtained via a validated semi-structured questionnaire and observational checklist. Data were analysed at 95% confidence limit.

RESULTS

The students had a mean age of 15.3±1.6 years. All the private schools had functioning WASH facilities whereas only 50% of public schools did. The toilet to student ratios for the private and public schools were 1:155 and 1:296, respectively. Over two-thirds (67.1%) of the students reportedly use sanitary napkins for MHM, followed by tissue (17.1%), and clothes (15.5%). Additionally, the private school students were two times less likely to use alternatives to sanitary napkins and 9.8 times more likely to obtain sanitary materials at school if required (p<0.001). A significantly higher proportion of public-school menstruating in-school adolescents changed their sanitary towels in the bush (p=0.003) due to lack of privacy and took their used sanitary materials home (p<0.001) for management due to reduced access to sanitary bins.

CONCLUSION

Even though the situation in the public schools was worse, both public and private schools lack the enabling environment for MHM. School health promotion interventions, such as provision of subsidized/affordable menstrual pads and basic WASH facilities and campaigns to break the culture of silence are required for the wellbeing of girls. This article is protected by copyright. All rights reserved.

School water, sanitation, and hygiene inequalities: a bane of sustainable development goal six in Nigeria

Objectives

The importance of school water, sanitation, and hygiene (WASH) in achieving the Sustainable Development Goal targets 6.1 and 6.2 in developing countries cannot be overemphasized. However, widespread WASH inequalities remain an impediment to achieving the targets by 2030. Hence, this study was conducted to examine current school-WASH disparities among public and private schools in a low-income Nigerian community using mixed methods.

Methods

The cross-sectional survey utilized multi-stage sampling to select 400 students from five public and five private schools in Akinyele, Ibadan. Semi-structured questionnaires and observational checklists were used to obtain data. Inferential statistics were measured at a 95% confidence interval. Independent variables like the students’ sociodemographic characteristics, school type, and available WASH facilities were associated with dependent variables like respondents’ hand hygiene and sanitation practices and WASH-associated knowledge and attitude to examine existing inequalities.

Results

Classifying the available WASH facilities based on the WHO/UNICEF Joint Monitoring Programme, none of the public schools provided any sanitation and hygiene service, while all the private schools provided both services. Furthermore, the private-school students had significantly better WASH knowledge (p<0.001; Ƞ2p=0.152) and attitude (p<0.001; Ƞ2p=0.036) compared with the public-school students. Also, a significantly higher portion of public-school students practiced open defecation at school (p<0.001; odds ratio (OR)=7.4; confidence interval (CI)=4.1–13.5) and at home (p<0.001; OR=7.8; CI=3.7–16.7).

Conclusion

WASH disparities among socioeconomic groups remain a persistent challenge. Sole reliance on the Government to narrow the inequalities has persistently proven unfruitful. There is a need to empower local community stakeholders to facilitate sustainable school-WASH interventions.

Characterisation of the epigenetic architecture of the major malaria vector Anopheles arabiensis (Diptera: Culicidae) after treatment with epigenetic modulators and heavy metals

Anopheles arabiensis (a member of the An. gambiae species complex) is a major vector of malaria in sub-Saharan Africa. Despite its disease vector status, there is currently a paucity of epigenetic information for this species. The aim this study was therefore to analyse global epigenetic markers and their response to metal exposure in insecticide susceptible and resistant laboratory strains of An. arabiensis. This was done using commercially available epigenetic marker quantification kits. In order to validate the efficacy of the kits, several kits were assessed to determine whether changes induced by known epigenetic modulators were detectable using these platforms. The efficacy of the dosages used were determined by examining the effect of the dosages used on insecticide resistant phenotypes. Upon confirmation that the dosages used were sufficient to induce a phenotypic change, the effect on epigenetic markers was assessed. Commercial kits were used to quantify 5-methylcysteine (5-mC) and 5-hydroxymethylcysteine (5-hmC) methylation in DNA, m6A methylation in mRNA as well as Histone Acetyl Transferase (HAT) activity. There was a marked difference in the phenotypic response in adult mosquitoes of the insecticide susceptible strain compared to that of its' resistant counterpart. For males and females of the resistant strain, exposure to nucleic acid modifying drugs typically increased their tolerance to insecticides. The patterns of changes in 5-mC methylation by epigenetic modulators was congruent with previous studies which quantified by mass spectrometry. The two strains differed in methylation patterns under control conditions and responded differentially to larval metal exposure. In the resistant strain, which previously was demonstrated to show increased detoxification enzyme activity and insecticide tolerance after the same treatment, the potential increase in transcriptional activity appeared to be modulated by reduced methylation and increased HAT activity. This study suggests that the commercial epigenetic quantification kits can be used to characterise phenotypic changes in An. arabiensis, and also shows that epigenetic regulation of the response to metal exposure is regulated at the DNA as opposed to the RNA level.